Centauri 200x/300x User Manual - MAYAH · Centauri 200x/300x, user manual as of software version...

Mayah

Communications

Centauri 200x/300xUser Manual

as of Software-Version 2.0.0.0

Order-No. MHH001Revision Level 02/2003

2 © MAYAH Communication GmbH

MAYAH, CENTAURI, FLASHCAST are registered trademarks. All other trademarks used are acknowledged withthis.

Centauri 200x/300x, user manual as of software version 2.0.0.0Order-No. MHH001Revision level 02/2003

© Copyright by MAYAH Communications GmbH

For copying this manual, even by extract, an explicit written permission of MAYAH Communications GmbH isrequired.

Centauri user manual revision level 02/2003 3

Table of Contents

1 Introduction......................................................................................................................9

1.1. First Steps / Quick Start ............................................................................................101.2. Controls on the Device..............................................................................................12

1.2.1. Switching On and Off..........................................................................................121.2.2. Controlling using the Front Keys.........................................................................121.2.3. Mask Display and Key Controls..........................................................................131.2.4. Set-up Dialog Selection ......................................................................................14

1.3. Remote Control using Software ................................................................................151.3.1. Remote Control via RS232 Interface ..................................................................151.3.2. Remote Control via IP.........................................................................................151.3.3. Automatic UDP-Scan..........................................................................................17

2 Installation......................................................................................................................19

2.1. Scope of Delivery ......................................................................................................192.2. Environment and Operating Conditions ....................................................................192.3. Connections ..............................................................................................................202.4. Program Installation ..................................................................................................202.5. Start Remote Control Software .................................................................................212.6. Control Remote Control Software via the Keyboard using Speed Dialling................212.7. Exit Program..............................................................................................................21

3 Basic settings ................................................................................................................23

3.1. Set Display Language ...............................................................................................233.2. Set Time, Date and Date Format ..............................................................................243.3. Set Display Contrast/Background Lighting................................................................243.4. Set Headphones Output............................................................................................253.5. Enter Identification Number.......................................................................................26

4 Phonebook .....................................................................................................................27

4.1. Saving Phonebook on a PC ......................................................................................274.2. Transfer phone book to CENTAURI..........................................................................274.3. Create Entry ..............................................................................................................284.4. Edit Entry...................................................................................................................304.5. Delete Entry ..............................................................................................................31

5 Configuration .................................................................................................................33

5.1. Individual Parameters ...............................................................................................335.1.1. Set Encoder ........................................................................................................335.1.2. Set Decoder........................................................................................................365.1.3. Set Inverse Multiplexer („Format“) ......................................................................37


5.1.4. Set Communication Interface .............................................................................385.1.5. Set Communication Basic Conditions.................................................................395.1.6. Set Device Address ............................................................................................405.1.7. Configure ISDN Adapter .....................................................................................415.1.8. Setting Dial Protection and ISDN Service Protection .........................................425.1.9. Set Quantization Procedure for G.711................................................................445.1.10. Set X.21 parameter.............................................................................................455.1.11. Set Time Limit (Timeout) ....................................................................................465.1.12. Switch Dual Mode On/Off ...................................................................................475.1.13. Set Digital Audio Out Sync. ................................................................................485.1.14. Set Signal Type of the Audio In/Out ...................................................................495.1.15. Set Mono Mix......................................................................................................505.1.16. Adjust Clipping Level ..........................................................................................515.1.17. Set Number Of COM Ports To Be Checked .......................................................525.1.18. Setting the ADAT Interface .................................................................................525.1.19. Display Hardware Equipment at Program Start ..................................................535.1.20. Switch Progress Display On/Off .........................................................................535.1.21. Switch Disconnect Dialog On/Off........................................................................545.1.22. Release Software Module...................................................................................54

5.2. Communication Profiles ............................................................................................555.2.1. Compile and Save Communication Profiles .......................................................555.2.2. Edit communication profiles................................................................................565.2.3. Delete communication profile .............................................................................565.2.4. Save communication profile on the PC...............................................................575.2.5. Transfer communication profile file to the CENTAURI .......................................57

6 Connections/Transmissions.........................................................................................59

6.1. Automatic Acceptance of Calls .................................................................................596.2. Prepare Connection/Transfer ....................................................................................60

6.2.1. Mix Input Signals and Adjust Level.....................................................................606.2.2. Select the correct bit rate....................................................................................60

6.3. Set up Connection.....................................................................................................616.4. Execute and Monitor Transmission...........................................................................636.5. Indications .................................................................................................................656.6. Cut Connection .........................................................................................................656.7. Connection Protocol ..................................................................................................66

7 Internet Protocol ............................................................................................................67

7.1. Remote Control via IP ...............................................................................................677.2. Digital Audio via IP ....................................................................................................67

7.2.1. One IP-packet carries more than one frame.......................................................687.2.2. One frame is carried by more than one IP-packet ..............................................68

7.3. Header information....................................................................................................697.3.1. MPEG Layer 2 / Layer 3 frame header...............................................................697.3.2. AAC/CT-aacPlus-Header....................................................................................697.3.3. AAC Low Delay...................................................................................................69

7.4. HTTP streaming over IP............................................................................................707.4.1. HTTP Streaming .................................................................................................707.4.2. Structure of HTTP Command Files.....................................................................707.4.3. Generating HTTP Command Files .....................................................................707.4.4. Executing HTTP Command Files .......................................................................71


8 Troubleshooting ............................................................................................................73

8.1. Monitor Device Condition ..........................................................................................738.2. Update Device Software............................................................................................74

8.2.1. Request of the Current Version Status ...............................................................748.2.2. Software Updating via ISDN...............................................................................758.2.3. Updating via FTP................................................................................................768.2.4. Updating via Internet...........................................................................................768.2.5. Updating via the RS232 Remote Port.................................................................76

8.3. Remote Control Software Registry Entries................................................................778.4. Remote Control Software Superuser Password........................................................79

9 Technical Data ...............................................................................................................81

Glossary ................................................................................................................................83

Menu Tree shown on the CENTAURI Display....................................................................85

Index......................................................................................................................................86

10 Appendix .....................................................................................................................88

10.1. ISDN Backup for a Faulty IP Connection...............................................................8910.1.1. Prerequisites.......................................................................................................8910.1.2. Short Introduction to Centauri Event Action Programming .................................8910.1.3. Description of ISDN Backup for a Faulty IP Connection.....................................8910.1.4. How to input all the necessary Commands to the Centauri................................8910.1.5. Necessary Commands .......................................................................................90

10.2. ISDN Backup for Faulty X.21/V.35 Connection .....................................................9110.2.1. Prerequisites.......................................................................................................9110.2.2. Short Introduction to Centauri Event Action Programming .................................9110.2.3. Description of ISDN Backup for a Faulty X.21/V.35 Connection ........................9110.2.4. How to input all the necessary Commands to the Centauri................................9110.2.5. Necessary Commands .......................................................................................92

10.3. Establish./Hang. Up Connections By External Switches .......................................9310.3.1. Prerequisites.......................................................................................................9310.3.2. Short Introduction to Centauri Event Action Programming .................................9310.3.3. Description of Starting/Ending Connections using External Switches ................9310.3.4. How to input all the necessary Commands to the Centauri................................9310.3.5. Necessary Commands .......................................................................................94

10.4. Event Action Programming ....................................................................................9510.4.1. Prerequisites.......................................................................................................9510.4.2. Short Introduction to Centauri Event Action Programming .................................9510.4.3. How to use the direct command dialog:..............................................................9510.4.4. Example : Event Action Programming ................................................................96

10.5. Point to Multipoint for Centauri 300x, 350x ............................................................9710.5.1. Prerequisites.......................................................................................................97Point-to-Multipoint............................................................................................................9710.5.3. Centauri Remote Software .................................................................................9710.5.4. Settings with Direct Command ...........................................................................9810.5.5. Start ....................................................................................................................98


10.5.6. Addressing..........................................................................................................9810.5.7. Observation on Frontpanel .................................................................................98

10.6. HTTP Streaming with Centauri StreamingServer ..................................................9910.6.1. HTTP streaming..................................................................................................9910.6.2. HTTP Command Files ........................................................................................9910.6.3. Execution of HTTP Command Files ...................................................................9910.6.4. Issues to consider in case of double assignment of a slot ...............................100

10.7. J.52 Connections .................................................................................................10110.7.1. Prerequisites.....................................................................................................10110.7.2. General .............................................................................................................10110.7.3. Synchronizing with J.52 ....................................................................................101

10.8. Dual Mode............................................................................................................10210.8.1. Prerequisites.....................................................................................................10210.8.2. Dual Mode ........................................................................................................10210.8.3. Available Algorithms .........................................................................................10210.8.4. Settings with the Centauri Remote Software ....................................................10210.8.5. Centauri Remote Software Direct Command ...................................................10310.8.6. Settings with Direct Command .........................................................................10310.8.7. Settings with the Centauri Front Panel .............................................................103

10.9. Multicast...............................................................................................................10410.9.1. Introduction .......................................................................................................10410.9.2. The process of Multicast...................................................................................10410.9.3. Centauri and Multicast ......................................................................................105

10.10. Centauri ISDN CAPI Trace ..................................................................................10710.10.1. General concepts of the application interface Common-ISDN-API ...............10710.10.2. Overview........................................................................................................10710.10.3. Message Overview........................................................................................10810.10.4. Message Structure ........................................................................................10810.10.5. Centauri and ISDN CAPI Trace.....................................................................11110.10.6. Executing ISDN CAPI Trace on Centauri ......................................................111

10.11. The New Centauri Keypad...................................................................................11210.11.1. Overview........................................................................................................11210.11.2. View of the old and the new Centauri............................................................11210.11.3. What has changed ........................................................................................11210.11.4. Additional Functions ......................................................................................11310.11.5. Table of Changes ..........................................................................................113

10.12. Centauri Streaming Server w. Different Media Players........................................11410.12.1. Streaming ......................................................................................................11410.12.2. Windows Media Player ..................................................................................11410.12.3. Real Player....................................................................................................11510.12.4. Winamp .........................................................................................................11510.12.5. Audio Quality .................................................................................................116

10.13. Centauri StreamingServer with Multicast .............................................................11710.13.1. Multicast ........................................................................................................11710.13.2. Multicast with the Centauri StreamingServer ................................................11710.13.3. Multicast with HTTP-Streaming.....................................................................11710.13.4. Multicast with Multicast-addressing...............................................................11810.13.5. Multicast with IP-addressing..........................................................................119

10.14. Using stereo and joint stereo with the CDQPrima ...............................................12010.14.1. Definitions......................................................................................................12010.14.2. Compatibility problems ..................................................................................12010.14.3. Solving the problems with the Centauri .........................................................120

10.15. Ancillary Data over MPEG Layer 3 with Centauri ...............................................12110.15.1. General..........................................................................................................121


10.15.2. Details ...........................................................................................................12110.15.3. Handshake ....................................................................................................121

10.16. Event Action Programming with TTL ...................................................................12210.16.1. General..........................................................................................................12210.16.2. Example ........................................................................................................12210.16.3. Centauri Centronic Port / TTL I/O..................................................................123

10.17. Connecting two Centauries with X.21 ..................................................................12410.17.1. Connecting Centauri with other devices........................................................12410.17.2. Connecting two Centauris .............................................................................12410.17.3. Requirement for connecting two Centauris ...................................................124

10.18. IP-connections with two Centauris.......................................................................12510.18.1. TCP ...............................................................................................................12510.18.2. Particularities on reconnects with IP/UDP.....................................................12510.18.3. Particularities on not recognizable algorithms with UDP...............................125

Introduction


1 Introduction

The devices of the CENTAURI series are audio gateways; in other words they are audio codecswith extensive network ability (Internet, Intranet, LAN, WAN). They support all common codingprocedures and transmission protocols.The 2000 and 3000 models (see Figures 1 and 2) can only be remote controlled.

Figure 1: CENTAURI 2000

Figure 2: CENTAURI 3000The 2001 and 3001 models (see Figures 3 and 4) also have an LC Display and a keyboard forcontrolling manually.

Figure 3: CENTAURI 2001

Figure 4: CENTAURI 3001The block diagram shows how the CENTAURI models work:

Figure 5: CENTAURI block diagram

Communication sectionAudio Section Transmit

Receive

CommunicationOutputMultiplexerEncoderSamplerate-

Concerter

ISDN S0

Modem /Ethernet /ATM / DSL

4

CommunicationInputDemultiplexerDecoderSamplerate

Converter

Monitor

AudioInput

AudioOutput

ISDN S0

Modem /Ethernet /ATM / DSL

4

InputProcessing

Output-Processing

228

analogAES/EBUADAT

228

analogAES/EBUADAT

X.21/V.35

X.21/V.35

First Steps / Quick Start


Event-dependent ControlCENTAURI Gateways can be programmed such that they react to particular, pre-determinedevents in a set way. Events can thus be linked with actions.

The event-dependent control is described in the Centauri Communication Reference Manualand several Application Notes. Please take note of our notifications (also in the Internet underhttp://www.mayah.com).

1.1. First Steps / Quick StartThe CENTAURI 2001 and 3001 Audio Gateways have a display and a keyboard on the front ofthe device. You can therefore set up a connection to another communication partner immediatelyas soon as you have unpacked such a device and connected it up to the mains and ISDN.

The information shown on the displays of the CENTAURI 2001 and 3001 Audio Gateways canappear in different languages (can be pre-set, see section "Set Display Language" on page23). On delivery the devices are set to the English language. This is why all the correspondingillustrations in this handbook show the English language display.

To set up an immediate connection, proceed as follows:• Switch on the device. The switch is to be found on the rear of the device (see Figure 14 and

Figure 15 on page 20). After a short time the CENTAURI start mask appears on the Display:

Figure 6: The CENTAURI Start Mask

• Select CONNECT with the arrow key and press *).The Connect Dialog will now appear on thedisplay:

Figure 7: Connect Dialog MaskThere are already entries with test numbers entered in the phone book when the device leavesthe works.

• If you want to try out one of the available test numbers, select PHONEBOOK and press *). Alist will then appear showing all the entries set at the works.

• Select one of the phone book entries with the and *) keys and press *). The devicethen immediately begins to create a connection to the selected number.

You can also enter an ISDN phone number manually and then set up a connection to the samenumber. This can be any ISDN phone number.• To set up an immediate connection to a new subscriber, select DIRECT DIAL and press

*). Only one input request for the new ISDN phone number appears on the display.

• Press *), use the number keys to enter the number for DEST.1 and the press *). again. • If required set DEST. 2 and enter the second number in the same manner.

*) See table on page 12 for devices through manufacturing year 2001.

Introduction


• Select CONNECT!. The device now immediately starts to set up a connection to the numbersentered.

In both cases you can follow the establishment of the connection on the display or in the programwindow:

Figure 8: Establishing a connectionIf the establishment of the connection is successful, the device automatically synchronizes itselfwith the partner at the other end of the line. If speakers are connected to the device, you too canhear the audio signal from the other end. The LC Display also jumps to the Status Dialog (seeFigure 69 on page 63) and displays the level of the in and out signal.If the establishment of the connection has been successful, the device switches back to the maskthat was displayed beforehand (see page 63).If the connection cannot be established, please check the following:– Does the ISDN setting correspond to the existing ISDN (see section ”Configure ISDN-

Adapter” on page 41)?– Is the device connected to an extension number meaning that it is necessary to dial a number

(e.g. zero) to get an outside line before a connection can be made (see section ”ConfigureISDN-Adapter” on page 41)?

If an arrow pointing up and/or down **) appears in a display, there are then other lines above orbelow the lines shown that you can shift up or down using and *) and then bring onto thedisplay.

*) S See table on page 12 for devices through manufacturing year 2001.

**) The arrows are aligned in accordance with device keypad function assignments through manufacturing year 2001for CENTAURI software prior to version 2.0.0.0.

Controls on the Device


1.2. Controls on the Device

1.2.1. Switching On and OffAll CENTAURI Gateways are switched on and off at the rear of the device (see Figure 14 andFigure 15 on page 20).After switching on and in rest mode the display (only available on the 2001/3001) shows the startmask (see Figure 6 on page 10). The “Power” display above right on the front of the housing lights up after the device is switchedon and when in rest mode (see Figure 1 and Figure 3 on page 9).

1.2.2. Controlling using the Front Keys

Figure 9: CENTAURI 2001/3001 control elements as of manufacturing year 2002

Figure 10: CENTAURI 2001/3001 round segment keys through manufacturingyear 2001, see table and footnote below

The CENTAURI 2001 and 3001 Audio Gateways have an LC display on the front of the devicewith a resolution of 128 x 64 pixels, control keys arranged in a ring and a 3-x-4 letter and numberkeyboard. Both devices can be controlled using these elements. The key configuration is asfollows:

0-9,#,*

Numbers 0-9 and letters if permitted (press respective key several times ifnecessary);For example, by repeatedly pressing the ‚2' key the sequence: ‚2' ‚A' ‚a' ‚B' ‚b' ‚C' ‚c' ‚2'etc. is generated)

Special Key Functions:If a list containing several elements appears at the display, skip to the top of the listby pressing “1”, or to the bottom by pressing “9”. Speed dialling by means ofabbreviated numbers is managed with the and keys. See details onpage 61.

through 2001*):

as of 2002*):

Move the cursor to the left or the right;In a list: move upwards or downwards;

Keys have an automatic repeat function; keeping one of the keys depressed movesthe cursor back and forth or up and down;

through 2001*):

as of 2002*):

In a list: leave list without activating (cancel dialog, escape function);

In an entry to be changed with number or character: delete character on the cursor

through 2001*):ENTER

as of 2002*):In a list: select entry:

otherwise: complete entry, close text output mask.

*) Labeling and assignment of functions to the four portions of the round segment keys (see Figure 9 and Figure 10)was changed as of manufacturing year 2002. The functions of the lower right-hand and upper left-hand segments havebeen swapped.

Introduction


1.2.3. Mask Display and Key ControlsThe mask representation and key controls (only CENTAURI 2001/3001) follow the followingrules:

1) 2) 3)

Figure 11: Mask displayThe mask title is top left (in Figure 111): “Analog Levels”). It is shown inverse. The actiondescription is found to the right of the mask title. In Figure 11 1) the request is SELECT ITEM,since no selection has been made. As soon as one of the list items is selected with the arrow

keys and activated by pressing , its name appears in the mask top right (see Figure 11 2)). Thislist item now reacts to the key input. In order to leave this list item and save the setting made, one

must press *).

After pressing the *) key in phone book or communication profile, the OK or CANCEL dialogsappear. In this the OK icon is pre-selected and furnished with a thicker outline (see Figure 113)).

Pressing the *) key again gives positive confirmation of the whole dialog in this case.

In all other dialogs the (also altered) setting is immediately taken over from the dialog with *).If in the case of phone book or communication profile dialogs you leave the dialog without makingany changes, i.e. you want to quit the dialog, then press *) and select the Cancel icon. When

you now press *), the dialog is closed without being saved or changed. To cancel all otherdialogs it is sufficient to press *).

If an arrow pointing up and/or down **) appears in a display, there are then other lines above orbelow the lines shown that you can shift up or down using and *) and then bring onto thedisplay.


**) The arrows are aligned in accordance with device keypad function assignments through manufacturing year 2001for CENTAURI software prior to version 2.0.0.0.

Controls on the Device


1.2.4. Set-up Dialog SelectionAfter you have selected SETUP and pressed *), the Setup appears. In the Setup CENTAURIGateways offer the following dialog selections:– New Phonebook Entry (see section “CreateEntry” on page 28)– Edit Phonebook Entry (see section "Edit Entry" on page 30)– Delete Phonebook Entry (see section "Delete Entry" on page 31)– Audio In-Out (see section "Prepare Connection/Transfer" on page 60)– Mono Channel Mix (see section “Set Mono Mix” on page 49)– Digital Audio Out Sync. (see section “Set Digital Audio Out Sync.” on page 48)– Audio Settings (see section "ADAT Interface" on page 52)– Audio Encoder (see section "Set Encoder " on page 33)– Audio Decoder (see section “Set Decoder” on page 36)– Timeouts (see section "Set Time Limit (Timeout)" on page 46)– Analog Levels (see section “ Set Signal Type of the Audio In/Out" on page 49)– Communication Interface (see section "Set Device Address" on page 40)– ISDN (see section "Configure ISDN Adapter" on page 41)– X.21 (see section “Set X.21 Parameter" on page 45)– Network (see section “ Set Device Address" on page 40)– New Profile Entry(see section "Compile and Save Communication Profiles" on page 55)– Edit Profile Entry (see section “Edit Entry" on page 56)– Delete Profile Entry (see section "Delete communication profile" on page 56)– Date & Time (see section “Set Time, Date and Date Format" on page 24)– Front Panel (see section "Set Display Contrast/Background Lighting" on page 24)– Headphone (see section "Set Headphones Output" on page 25)– Identification (see section “ Technical Data" on page 75) – Ancillary (see section “Set Communication Basic Conditions" on page 39)– Security (see section "ISDN Service Protection" on page 42)– Miscellaneous (see section "Set Quantization Procedure for G.711" on page 44)

Introduction


1.3. Remote Control using Software All CENTAURI versions can be remote-controlled using a PC with the Windows 95/ 98/ME/NT/2000 operating systems. For this purpose special PC remote control software is included inthe scope of delivery.

Figure 12: The main window of the CENTAURI remote control softwareThere must be a connection between PC and CENTAURI – either via a serial RS232- interface orvia Internet Protocol (IP).

1.3.1. Remote Control via RS232 InterfaceThe following are required for remote-controlling the CENTAURI via a serial RS232 interface:

– PC with RS232 interface– 9-pole zero modem cable (included in scope of delivery)

The CENTAURI RS232 interface uses the following parameters:– Baud rate: 9600, 19200, 38400 (delivery condition) 57600, 115200– Data bits: 8– Stop bits: 1– Parity: none– Protocol: none

At the first Start the remote control software scans by default serial port 1 automatically(works settings). If the CENTAURI is controlled by one of the serial interfaces 2 to 8,the number of the ports to be scanned must be increased in the remote control menuitem EXPERT OPTIONS correspondingly.

1.3.2. Remote Control via IPThe CENTAURI versions 3000 and 3001 can also be remote-controlled via the network interfacecard via Internet Protocol. For this it must simply be started on any PC within the network and thenetwork address or the name of the CENTAURI must be entered. The remote control softwarethen creates a Windows socket connection to the CENTAURI via Internet Protocol.The following is needed for remote-controlling the CENTAURI via IP:

– PC with 10 Mbit/s or 100 Mbit/s Ethernet– IP protocol installed– IP network and normal RJ45 network cable

For controlling via IP, the CENTAURI must be given a free IP address that corresponds to thesub-network mask of your network. Where larger networks are concerned the user should in allevents contact the network administrator.

Example for assigning an IP Address:A CENTAURI should be operated on a network where the following applies:– The IP Addresses 192.168.1.0 to 192.168.1.100 have already been assigned– The sub-network mask is 255.255.255.0– The CENTAURI Gateway should contain IP Address 192. 168.1.101

Remote Control using Software


Steps for the CENTAURI 2000/3000First of all the IP Address must be entered using the remote control software (RS232):• Select EXPERT DIRECT COMMAND in the remote control software.• Enter the command 'ip_address 192.168.1.101' and confirm with OK.• Close the remote control software.• Boot the CENTAURI anew (switch off and then on again)

Steps for the CENTAURI 2001/3001

• Set SETUP NETWORK ADDRESS on the front of the device and then enter '192.168.1.101'.• Boot the CENTAURI anew (switch off and then on again)

Enter CENTAURI for Controlling via IP

• In order to enter a CENTAURI in the remote control software, select SETTINGS REMOTESETTINGS (manual). The following dialog window opens:

Figure 13: Setting the CENTAURI remote control via IP or RS232

• Click on ”IP” and enter the IP Address of the CENTAURI that is to be controlled with thesoftware under ”Add New CENTAURI”.

Port 2000 has nothing to do with Port 2001 that has been entered in the CENTAURI under”Network”! Changing one of these two or both values results in communication problems!

• So that the entries are effective, click on ”OK”.

Difference between 'Now' and 'Next Start':- In the case of 'Now' the connection to the given IP Address is activated immediate- In the case of 'Next Start' the connection to the given IP Address is first valid the next timethe remote control software is started.Advantage:If the current stage of the remote control software is not closed and the remote controlsoftware started again with a new IP Address, several CENTAURIs can be controlledsimultaneously.

Introduction


1.3.3. Automatic UDP-Scan• With selecting SETTINGS REMOTE SETTINGS (automatical)it is possible to examine

the LAN or the serial interfaces for other Centauris. The following dialog window opens:

• Enter the Number of com ports for setting the number of serial interfaces that are to be

examined or

• Select UDP Scan ‘Yes’ for scanning the LAN for other Centauris.

• Click on ‘OK’ for activating the scan.

The current action is displayed during the scan, e.g. ‘Try Com Port 1 at baud rate9600‘.

All found Centauris are listed below with information about number of comport, baudrate andCentauri name/serial number in case of scanning serial interfaces or IP-address and Centauriname/serial number in case of scanning the LAN.

Remote Control using Software


Installation


2 Installation

Attention! When installing the CENTAURI in a rack or another assembly you should make sure thatthe housing rests on a guide rail or cross brace etc. so that they can bear the weight of thedevice. The device must rest on a support and not just fixed onto the front plate.

2.1. Scope of Delivery

– 1 CENTAURI– 1 Zero modem cable for remote control– 1 mains cable (suitable for the country concerned) – optional: 1 ISDN cable per ISDN line– if ordered: 1 X.21cable– if ordered: Digital AES– 1 CD– this handbook

2.2. Environment and Operating Conditions

Attention!Do not subject the device to damp (e.g. proximity to humidifiers etc.), heat (e.g. proximityto radiators, direct sunlight) or mechanical stress (e.g. shaking)!Make sure that the ventilation openings of the device are not obstructed when the deviceis in operation, so that the air exchange necessary for the cooling of the device is nothindered!

The detailed environment and operating conditions are to be found in the chapter "TechnicalData" on page 75 f.

Connections


2.3. Connections

Figure 14: Plug-in field 2000/2001 (rear side, example representation)

Figure 15: Plug-in field 3000/3001 (rear side, example representation)

Figure 16: Plug-in field 3000/3001 with E1 (rear side, example representation)The plugs for the X.21 connection does not conform to standards. Instead of the usual 15contacts in two rows, the socket plugs on the rear of the CENTAURI 3000/3001 has 26 contactsin three rows. The socket plugs can thus be used either as V.35 or X.21 connection. A corre-sponding cable with the necessary pin configuration can be obtained from Mayah.

2.4. Program InstallationTo install the remote control software, start “SETUP.exe” in the software list on the CD-ROMsupplied and follow the installation program instructions.

2000/2001

Power Switch/Power Connector

Service-port

USBAncillary

Data

RemoteControl

TTL in/out ISDN 2

ISDN 1Audio in R (XLR)

Audio out L (XLR)Audio out R (XLR)

Audio in L (XLR)

3000/3001


Service-port

USBAncillary

Data

RemoteControl

TTL in/out Opt. Digitalinput/outpu

(TOSlink)

ISDN 1 ... 4AES/EBUAudio in R (XLR)


Audio in L (XLR)

X.21/RS422/V35-2

X.21/RS422/V35-1

LAN

3000/3001


Service-port

USBAncillary

Data

RemoteControl

TTL in/out Opt. Digitalinput/outpu

(TOSlink)

ISDN 1 ... 4AES/EBUAudio in R (XLR)


Audio in L (XLR)

X.21/RS422/V35-2

X.21/RS422/V35-1

LAN

E1: TS2, MON, DI, DS2

Configuration LEDs

Installation


2.5. Start Remote Control Software

• To start the remote control software, click on the program icon or double-click on the name ofthe program file in the program list in Explorer.

The remote control program automatically starts the COM interface after it is called up. If aCENTAURI Gateway is connected to one of the COM interfaces, the program recognizes thegateway and synchronizes itself with it automatically.

2.6. Control Remote Control Software via the Keyboard using SpeedDialling As an alternative to controlling using the mouse, most of the CENTAURI remote control softwarefunctions can also be controlled using the keyboard. Here an overview:

Key Effect<ALT> + <letter> Select the appropriate menu option

Main windowp Opens the Phonebook the same as clicking on the ”Phonebook ”

switch with the mouse;

c Opens the ”Connect” dialog window the same as clicking on the”Connect” switch with the mouse;

m Calls the Mayah Homepage; is the same as clicking on the centralswitch surface with the mouse;

End Ends the CENTAURI’s current connection; is the same as clickingon the ”Disconnect” switch with the mouse;

All dialogsEnter Is the same as mouse-clicking on ”OK”;

Escape Is the same as mouse-clicking on ”Cancel”:

Phonebook dialogE For editing an entry in Phone book; corresponds to double-clicking

on a Phonebook entry with the mouse;

Enter Uses the Phonebook entry selected at that particular moment; cor-responds to clicking on the ”Connect” switch with the mouse;

Delete Deletes the Phonebook entry selected at that particular moment;corresponds to clicking on ”DEL” with the mouse;

Insert Creates a new Phonebook entry; corresponds to clicking on ”New”with the mouse;

Profile dialog in the <Expert/profiles> menuE For editing the profile selected at that particular moment; corre-

sponds to double-clicking on a profile with the mouse;

Delete Deletes the profile selected at that particular moment; correspondsto double-clicking on ”DEL” with the mouse;

Insert Creates a new profile; corresponds to double-clicking on ”New”with the mouse;

You can find more detailed information in the appropriate sections of this handbook.

2.7. Exit Program

To exit the program, click on or select FILE EXIT.

Exit Program


Basic settings


3 Basic settings

3.1. Set Display LanguageThe displays on the CENTAURI 2001 and 3001 Audio Gateways can appear in various lan-guages. On delivery the devices are set to English. This is why all the respective illustrations inthis handbook show the display in English.The language used in the display can be set using the keys on the front of the housing:• Select the SETUP option in the start mask (see Figure 6 on page 10). The Setup mask

appears.• Select MISCELLANEOUS. The following mask appears:

Figure 17: The MISCELLANEOUS mask

• Select the LANGUAGE line with the *) key and press *).

• Confirm the restart report and press *) again. The selection of the possible languagesappears.

• Select the desired language with the or the *) key and press *) again.The device starts again (”Reboot”). After this the information shown in the display will be in theselected language.


Set Time, Date and Date Format


3.2. Set Time, Date and Date Format CENTAURI Gateways have an internal clock that is supplied with a battery in the event of apower cut etc. This is why it is only rarely necessary to set the internal clock.To set the CENTAURI’s internal clock and/or date and/or the format for time displays, proceed asfollows:a) Via the front panel:• Select the SETUP option in the start mask (see Figure 6 on page 10). The Setup mask

appears.• Select DATE & TIME. The following mask appears:

Figure 18: The DATE & TIME mask

The abbreviations in the mask have the following meanings:

– Y-M-D = Year, Month, Day (format can be sorted)– D-M-Y = Day, Month, Year (Germany)– M-D-Y = Month, Day, Year (US format)

• Set the desired information with the , and *) keys and the number/letter keys.• To close and save press *).

The time and date format set here affects the display in the journal. The time and dateinformation in the journal is shown in the format set here.

a) Via the remote software:• Select STATUS CENTAURI TIME;• Set the desired time and date with the mouse;• Click on OK;

3.3. Set Display Contrast/Background LightingTo set the contrast of the LCD and to switch the background lighting on and off, please proceedas follows:• Select the SETUP option (see Figure 6 on page 10) in the start mask. The Setup mask

appears.• Select the FRONTPANEL. The following mask appears:

Figure 19: The FRONTPANEL mask

• Set the desired values for contrast and lighting with the , and the *) keys.

• To save press *).• To quit press *).


Basic settings


3.4. Set Headphones OutputTo set the headphone audio source and volume proceed as follows:• Select the SETUP option (see Figure 6 on page 10) in the Start mask. The Setup mask

appears.• Select HEADPHONE. The following mask appears:

Figure 20: The HEADPHONE mask

• Set the desired values with the , and the *) keys. You can select and hear thefollowing signals under SOURCE:

Source Headphone left Headphone rightstereo L R

left channel L L

Decoder

right channel R R

stereo L R

left channel L L

Encoder

right channel R RThis is for example of interest for bilingual transmissions.

• To quit press *).


Enter Identification Number


3.5. Enter Identification NumberAt the factory each CENTAURI is assigned a unique serial number. This identifies each CEN-TAURI during communication.In addition the operator can give a CENTAURI Gateway an identification number consisting ofnumbers and letters (maximum 128 characters). This number can also be assigned identicallyseveral times where several CENTAURIs are involved (e.g. company name etc.). Thisidentification number is exchanged both ways during communication.To enter the identification number, proceed as follows:(a) On the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.• Select IDENTIFICATION. The following mask appears:

Figure 21: The IDENTIFICATION mask

• Enter the desired number with the , and the *) keys and the number/letter keys.• To close and save press *).(b) Via the remote software:• Select STATUS CENTAURI IDENTIFICATION;• Enter the desired identification;• Click on OK;


Phonebook


4 Phonebook You can enter the numbers of partners you often call in a phone book. These entries can beactivated by simply pressing a key. Every entry in a phone book is administered by name and contains the respective communicationprofile.The entries appear sorted alphabetically by name.

They can be shifted up and down on the LC display with the and the *) keys. An entry is

always shown inverted. This is selected as soon as you press the *) key. So that you don’t haveto endlessly scroll up and down in a long list, you can hop to the beginning of the entries bypressing a number or letter key direct with this symbol. Beyond this, you can skip to the top of thelist by pressing “1”, or to the bottom by pressing “9”.

Figure 22: Subscriber list in the phone book; representation on the LC display In the windows of the remote control software on the Windows PC there are the usual scrollingbars for navigating. An entry is selected by mouse-click.You can copy a CENTAURI’s phone book on to a connected PC and save it there. On the otherhand you can also transfer such a telephone file back onto a CENTAURI where you can use theentries. You therefore have the possibility of distributing one phone book on to as manyCENTAURIS as you want.

4.1. Saving Phonebook on a PC

• To save a CENTAURI’s phone book on a PC, select FILE SAVE PHONE BOOK in the mainwindow of the remote control software. A dialog window with the file list then opens.

• Enter the desired list and a file name on the PC.

The file automatically includes the ending “.ctr”.

• Click on ”OK.The phone book is then read out of the CENTAURI and saved in the given file. This is a pureASCII file that can be edited with a simple text editor.

4.2. Transfer phone book to CENTAURI

• To transfer a phone book file from PC to CENTAURI, select FILE LOAD CENTAURI FILE inthe main window of the remote control software. Then a dialog window opens with the file list.

• Select the desired hone book file and click on ”OK”.The phone book file is then transferred to the CENTAURI. The phone book entries are thenimmediately available.When the transfer is made, the existing phone book entries are written over in the CENTAURI.


Create Entry


4.3. Create EntryTo create a new phone book entry proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select NEW PHONEBOOK ENTRY and press the *) key. The following mask appears:

Figure 23: The NEW ENTRY mask

• Select one line after another using the *), and *) keys and enter the desired data.Thereby please note:

– NAME is the sorting and administration criterion The symbols are inserted at the position where the cursor is. Repeated pressing onone key brings the next symbol to the cursor position. When the desired symbol hasbeen reached, wait a moment: the cursor jumps to the next position automatically aftertwo seconds.If the entry is longer than the number of characters that fit in the input line, the line isshifted so that the cursor position can always be seen.

– For ENCPROFILE and DECPROFILE you can enter a communication profile.– The transfer medium is entered with INTERFACE. This can be Loop, X.21 or ISDN,

and in the case of CENTAURI 3000/3001 also NET. – DESTination determines the destination address and in the event of an ISDN con-

nection the number of the ISDN connection. In the case of network connections this iswhere one enters an IP Address.In the case of multiple channel ISDN connections there are respectively more des-tination fields in which one must enter the numbers of the ISDN phones.

• End the entry process by pressing the *) key and confirm the query “Save new entry” with*).

The entry has now been saved to the phone book.

If you started the entry procedure with the key, you assigned a number yourself rightfrom the start which can be used as an abbreviated dialling number (see section "abbreviated" on page 61). In all other cases, a consecutive number is assigned when the entry is saved.


Phonebook


(b) Via the remote control software:• Click on the ”Phone book” button or press the ”P” key. The following dialog window opens:

Figure 24: The PHONE BOOK dialog window

• Click on “New” or press the “Insert” key on the keyboard. The following dialog window opens:

Figure 25: The NEW PHONE BOOK ENTRY dialog window

• Enter name, number of the ISDN line or network address and select a communication profileand the interface.

• To enter, click on “OK”.This saves the entry in the phone book. A consecutive number is assigned automatically at this time, whichcan be used as an abbreviated dialling number (see section "abbreviated " on page 61).

Edit Entry


4.4. Edit EntryExisting phone book entries can be edited at any time. (a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select EDIT PHONE BOOK and press *). A list appears that contains all the entries in thephone book.

• Select the desired entry with the and *) keys and the press *). The selected entryappears in the same style as for new entries (see Figure 23 on page 28) and can now beedited.

• Change the data as desired;

• Save the changes by pressing the *) key and finish with *).(b) Via the remote control software:• Click on the “Phone book” button or press the “P” key. The “Phone book” dialog window opens

(see Figure 24 on page 29).• Select an entry with the scrolling bars or the cursor keys.• Double-click on the entry to be edited or press the “E” key. The “Change Phonebook Entry”

dialog window opens (corresponds to Figure 25 on page 29).• Edit the data as desired.

• To save, click on ”OK” or press the *) key on the keyboard.The change in the phone book is now saved.


Phonebook


4.5. Delete EntryExisting phone book entries can be deleted at any time. (a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select DELETE PHONE BOOK ENTRY and press *). A list appears with all the phone bookentries.

• Select the entry to be deleted with the and *) keys;

• Press *); after a security request the entry will be deleted;(b) Via the remote control software:• Click on the “Phone book” button or press the “P” key. The “Phone book” dialog window opens

(see Figure 24 on page 29).• Click on the entry to be deleted. This is marked with an inverse display.• Click on ”DEL” to delete or press the ”Delete” key on the keyboard. The marked entry will be

deleted from the screen display. • Repeat both the above steps for each entry to be deleted.

If you click on ”Cancel”, the deletion is not carried out and the entry appears / the entriesappear again when the phone book is opened up again.

• To confirm the deletion and really execute it, click on ”OK”.The entry / entries are now deleted from the phone book.


Delete Entry


Configuration


5 Configuration

5.1. Individual ParametersIf you use the built in phone book function for dialling a communication partner (selecting analready entered communication partner), you do not have to set individual parameters since eachphone book entry already contains all the necessary data regarding the individual parameters.If however you dial a communication partner without using the phone book function, i.e. ”direct byhand”, it might also be necessary to set individual connection parameters manually.

5.1.1. Set Encoder You can set the encoder to 2 operational modes:– Dependency: ”remote”; With this, the encoder is set according to the parameter that it

receives from the distant decoder when the connection is made;

For all Mayah products (CENTAURI, SendIt) in “Automatic Mode” (Dependency: Remote,Format: Automatic) it is fundamentally valid that the calling device gives the settings forencoder and decoder.If a connection is made to a device from another manufacturer, the data flow coming fromthis device is used to determine with which setting this encoder works. This setting is thenused for the decoder and also the CENTAURI’s encoder.This guarantees that a bi-directional audio connection also comes into being for thesedevices in most cases, without making additional settings.

– Dependency: ”local”; With this the encoder uses the locally set parameters in all cases,regardless of which device is on the other end of the transmission path or what the con-stitution of the received data flow is.

This setting should only be chosen if the receiving device can also recognize the oppositeend automatically, which is however incompatible with the CENTAURIs.The “local” dependency setting for the decoder results in the fact that no adjustment ismade to the incoming data flow. If the setting does not suit the data flow, either no, orfaulty, audio is decoded.Via Format it is also possible to set “CDQ/H.221” (CCS), “MUSICTAXI”, “Micda” (if re-leased), “Aptx” (if released) and “J.52” as well as “Automatic”.The setting “CDQ/H.221” switches the CENTAURI into a mode for transmitting MPEGLayer 2 data flows over more than two ISDN B channels to a CCS-CDQPrima.

Individual Parameters


Special features for encoder / decoder settings with regard to dependency andformat in combination with devices from other manufacturers

Encoder Decoder RemoteDevice

Description

Dependency = RemoteFormat = Auto

Dependency = RemoteFormat = Auto

CENTAURI default setting. TheCENTAURI always performs inaccordance with the remotedevice with this setting. Thereare a few exceptions to this rulewhich are explained below.

Dependency = RemoteFormat = CDQ/H.221Bit rate =384 kbit/s stereo192 kbit/s mono

Dependency = RemoteFormat = CDQ/H.221Bit rate =384 kbit/s stereo192 kbit/s mono

CDQPrimawithproprietaryH.221

When a CDQPrima calls aCENTAURI, automatic remotedevice recognition is functional(format = auto). If, on the otherhand, a CENTAURI calls aCDQPrima, the channelconnections are established tooquickly. The “Format =CDQ/H.221” setting assures thatchannel connections areestablished one after the other.

Dependency = LocalFormat depends uponremote device

Dependency = LocalFormat depends uponremote device

Asymmetrical coding,encoder settings identical toremote device decoder settings,decoder settings identical toremote device encoder settings

Format = J.52 Dependency = LocalContains other desiredparameters

J.52, but with fixed responsevalues:J.52 normally negotiates thehighest possible standardseparately for each direction.For example, a device alsoaccepts MPEG L3 at the re-ceiver side (if technically fea-sible), even if it uses MPEG L2at the transmitter side.However, if the settings“Format = J.52” and“Dependency = Local” havebeen selected, the CENTAURIalleges that it only understandsthe decoder settings.

Dependency = LocalFormat = J.52Type = G.722

G.722 stat. framing:G.722 stat. framing cannot berecognized automatically,because no in-band signalingoccurs. The CENTAURInormally uses the G.722 stat.framing timeout to this end(recommended: 25 sec.). Astatistical audio signal must bepresent for signal recognition(not a sinusoidal tone!).

Dependency = LocalBit rate = path cycle rate

X.21/V.35

A detailed description of the J.52 format and automatic remote device recognition is available asa PDF file in the “Application Note (7)” from the download page at http://www.mayah.com.

Configuration


To set the encoder, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select AUDIO ENCODER and press *). The following mask appears:

Figure 26: The ENCODER mask

• Select the parameter to be changed with the and *) keys and then press the *) key. Alist of all possible values appears.

• Select the desired value with the and *) keys and then press the *) key.• Repeat this procedure if required for additional parameters.• End the setting by pressing the *) key.(b) Via the remote control software:• Select SETTINGS CODEC. The following dialog window opens:

Figure 27: The CODEC SETTINGS dialog window

• Select the desired value the individual encoder lines.

Note: The selection options for the decoder are explained in section “Set Decoder” on page36.

• To make the settings effective, click on ”OK”.




5.1.2. Set Decoder You can pre-set the decoder with 2 operational modes:– Dependency: ”remote”; to this the decoder sets itself to the parameter that it receives from the

distant encoder when the connection is made;– Dependency: ”local”; with this the decoder uses the locally set parameters;To set the decoder, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select AUDIO DECODER and press *). The following mask appears:

Figure 28: The DECODER mask

• Select the parameter to be changed with the and *) keys and then press the *) key. Alist of all possible values appears.

• Select the desired value with the and *) keys and then press the *) key.• Repeat this procedure if required for additional parameters.• Exit the parameter setting function by pressing the *)key.(b) Via the remote control software:• Select SETTINGS CODEC. The following dialog window opens:


• Select the desired values under DECODER .....

It is only possible to set the decoder parameter if ”Dependency” is set to ”local”.

• To make the settings effective, click on ”OK”.


Configuration


5.1.3. Set Inverse Multiplexer („Format“)If a data stream is greater than the capacity of a transmission channel, it is then necessary to usetwo or even more ISDN B channels to ensure delay-free transmission. The transmitter musttherefore split the data over the individual B channels and the receiver must put them backtogether again properly after the transmission. In the context of MPEG coded audio signals thisprocedure is often called inverse multiplexing (IMUX). There are several different procedures for inverse multiplexing. The CENTAURI Gatewayssupport the international standard J.52 and the proprietary procedures of various manufacturers.If you know exactly which device is on the receiving end, you can pre-set this device at themultiplexer. The CENTAURI Gateways are however able to recognize the opposite stationautomatically and set themselves accordingly.To set the multiplexer, proceed as follows:(a) Via the front panel• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select AUDIO ENCODER or AUDIO DECODER and press *). The following mask appears:

Figure 30: The ENCODER or DECODER mask

• Advance to the FORMAT line with the help of the and *) keys.

• Press the *) key. A list of possible selections appears.• Select one of these options with the and *) keys and save the desired value by

pressing the *) key.• End the setting by pressing *).(b) Via the remote control software:• Select SETTINGS CODEC. The following dialog window opens:


• Select the desired option under ENCODER FORMAT. • Click on ”OK” to save.




5.1.4. Set Communication InterfaceYou can determine via which communication interface a connection is to be established. Thefollowing are available– ISDN,– Loop (for test purposes) and when the CENTAURI is correspondingly configured,– X.21and with the CENTAURI 3000/3001– NETTo set the communication interface, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select COMMUNICATION INTERFACE and press *). The following mask appears:

Figure 32: The COMMUNICATION INTERFACE mask

• Press *).• Select the desired communication interface with the help of the and *) keys and press

*).• End the setting by pressing .(b) Via the remote control software:With the remote control software the communication interfaces and if necessary the networkaddress are selected in the “Connect” dialog (see also section "Set up Connection" on page 61).

Figure 33: The CONNECT dialog window with different selected interfaces


Configuration


5.1.5. Set Communication Basic ConditionsYou can set the subordinate data transmission parameters (baud rate, handshake procedure,number of data bits, parity, stop bits) manually using the front panel of the CENTAURI.• Select the option in the device Start mask (see Figure 6 on page 10) die Option SETUP. The

Setup mask appears.

• Select ANCILLARY and press *). The following mask appears:

Figure 34: The ANCILLARY mask

• Select the desired parameter with the and *) keys and press *).

• Select the desired value with the and *) keys and press *).• Repeat this for each parameter to be changed.• Finish the setting by pressing *).




5.1.6. Set Device AddressYou can assign the CENTAURI an address.

Attention! For operational security reasons an IP address should only be entered manually inagreement with the network administrator. Setting the IP address yourself can lead tosystem disturbance.

To enter the address, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select NETWORK and press *). The following mask appears:

Figure 35: The COMMUNICATION INTERFACE mask

• Select the ADDRESS parameter with the and *) keys and press the *) key.• Enter the desired address using the and *) keys, as well as the numeric keys, and then

press the *) key.• Repeat this procedure for each address which needs to be changed.• Exit the address setting function by pressing the *) key.(b) Via the remote control software:• Select Settings Network. The following dialog window opens

Figure 36: The Network Configuration dialog window

• Enter the address.• Click on OK.The entered IP address is now transmitted to the CENTAURI and entered there.• For reasons of communication security you should now close the remote control software and

restart. • Switch off the appropriate CENTAURI and switch it back on after a few seconds.


Configuration


5.1.7. Configure ISDN Adapter If necessary you can set the ISDN adapter. This includes for example the dialling code if thedevice is used on an extension system.To set the ISDN adapter, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select ISDN and press *). The following mask appears:

Figure 37: The ISDN mask

• Select the desired parameter with the and *) keys and press the *) key.• Enter the desired value using the and *) keys, as well as the numeric keys if

applicable, and then press the *) key.• Repeat this procedure for each parameter which needs to be changed.• Exit the configuration mode by pressing the *) key.(b) Via the remote control software:• Select SETTINGS ISDN. The following dialog window opens:

Figure 38: The ISDN CONFIGURATION dialog window

• Set the necessary values.Some entries are specific to the country in question and only appear on selecting the Dchannel protocol:B-Channel – To be able to set the MSN of a B channel, the corresponding B channel must firstbe selected.Get Dialtone – The purpose of this item is that a CENTAURI can be used just as well on atelephone system as on a multiple device line.Example: Get Dialtone set to 0 means that all numbers dialed will be preceded by a 0.Pre-dial No. – Serves to select the service provider. In Germany, Predial No 01033 meansthat Deutsche Telekom will always be used.

• To make the new parameter effective, click on “OK”.




5.1.8. Setting Dial Protection and ISDN Service ProtectionUndesired calls and network queries can be blocked from the CENTAURI if necessary. Twoparameters are provided to this end:– “Dial protection” and– “ISDN service protection”Dial protection allows you to determine whether or not the CENTAURI will accept all calls andnetwork queries, or only calls and network queries from callers who have already been entered tothe phone book.ISDN service protection allows you to specify whether or not calls with certain ISDN serviceindentifications will be ignored by the CENTAURI. The following service identifications can bespecified:– no profile– speech– unrestricted dig. info– restricted dig. info– 3.1 kHz audio– 7.0 kHz audio– video– packet mode– 56 kB/s rate adapt.– telephony– facsimile 2/3– facsimile 4/1– teletex mixed mode– teletex processable mode– teletex basic mode– videotext– telex– x.400– x.200– 7.0 kHz telephony– video teleph. first– video teleph. sec.Each service identification can be individually enabled or disabled.

Attention! Do not change dial protection or the service identification settings unless you knowexactly what to change. Desired calls might otherwise be inadvertently blocked as well.

In order to set dial protection or select permissible service identifications at the housing frontpanel, proceed as follows:(a) Via the front panel:• Select the SETUP option in the start mask (see Figure 6 on page 10). The setup mask

appears.

• Select SECURITY and press the *)key. The following mask appears:

Figure 39: The SECURITY Mask

• Select “Dial Protection” or “ISDN Service Protection” with the and *) keys and then

press the *) key.


Configuration


• Select the desired parameter with the and *) keys and then press the *) key.

• Select “on” or “off” and then press the *)key;• Repeat this procedure for each parameter which needs to be changed.• End the setup procedure by pressing the *) key (twice if necessary).(b) Via the remote control software:

1) Activating Dial protection• Select SETTINGS OTHERS. The following dialog box appears:

Figure 40: The OTHER SETTINGS Dialog Box

• Select the appropriate parameter setting under “Dial in protection” (“On” or “Off”).• In order to activate the new setting, click the “OK” button.

2) Setting up ISDN service protection• Select EXPERT ISDN SERVICES. The following dialog box appears:

Figure 41: The ISDN SERVICES Dialog Box

• Click the check boxes which need to be changed. means “ISDN service identification disabled”. means “ISDN service identification enabled”.

• In order to activate your new settings, click the “OK” button.




5.1.9. Set Quantization Procedure for G.711 Depending on the country, it can be necessary to set quantization procedure G.711 for ISDNtelephony. This setting must be made when setting up operation and when the procedure used ischanged (e.g. when the location of the device is changed).To set the quantization procedure, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select MISCELLANEOUS and press *). The MISC mask appears.

Figure 42: The MISC mask

• Press *) again.• Select the respective parameter for “G711” (“A LAW” for Europe, “µ LAW” for USA) with the

and *) keys and press the *)key.• If necessary, set other parameters as desired in the same way (“G711 Level”, “Dualmode” and

“Subcodec”).• To end, press *).(b) Via the remote control software:• Select SETTINGS OTHERS. The following dialog window opens:

Figure 43: The OTHER SETTINGS dialog window

• Select the appropriate parameter (“A LAW” for Europe, “µ LAW” for USA) under “G.711 law” • To make the new parameter effective, click on “OK”.


Configuration


5.1.10. Set X.21 parameter For the connection via X.21 it is possible to set different parameters. The following can be set:– X.21 Channel (1 or 2)– X.21 Mode (DTE or DCE)– X.21 Clocking (T2, T4, T2T4, ..., see Centauri Interface Manual, chap. 1.5.2 to 1.5.5)– X.21 Protocol (X.21 or V.35, compare with note page 16)

In X.21 operation a device must give the settings in advance. An encoder must therefore beset to ’local’.

To set X.21 parameters, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select X.21 (only possible if X.21 interface is available) and press *). The X.21 maskappears.

Figure 44: The X.21 mask

• Select MODE and press *).

• Select DTE or DCE and press *).

• Select CLOCK and press *).A list of possible selections appears.• Select the appropriate clock parameter (“T4” for DTE- Mode, “T2T4” for DCE-Mode) with the

and *) keys and press *).• To complete, press the *) key twice.(b) Via the remote control software:• Select SETTINGS X.21 in the remote control software. The following dialog window opens:

Figure 45: The X.21 CONFIGURATION dialog window

• Select the desired value of the parameter to be altered (X.21 clocking to “T4” for DTE mode,X.21 clocking to “T2T4” for DCE mode) and then click on “OK”.

The changes will now be transmitted to the CENTAURI.




5.1.11. Set Time Limit (Timeout)For particular transmission procedures (e.g. UDP) it is necessary to set a time limit.To set the time limit, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select TIMEOUTS and press *). The TIMEOUTS mask appears.

Figure 46: The TIMEOUTS mask

• Select the appropriate parameter (“Disconnect” or “Stat. framing”) with the and *) keys

and press the *) key.

The time after which the CENTAURI should break off the connection attempt when nosynchronization (framing) is achieved is set with the “Disconnect” parameter. After this time hasexpired the ISDN channel(s) are automatically cut off.The parameter “Stat. framing” gives the time interval after which the G.722 decoder should bestarted automatically in the case of a single channel ISDN connection if no other procedure isrecognized.Both parameters are given in seconds.

• Enter the desired values (seconds) with the number keys.

• To save press *) again.• Press the *) key to end.(b) Via the remote control software:• Select SETTINGS OTHERS. The following dialog window opens:

Figure 47: Additional settings

• Enter the desired time limit under “G.722 stat. framing timeout” or “Disconnect timeout”.

G.722 stat. timeout shows how many seconds after the establishment of the connection theCENTAURI switches to G.722 stat. framing if there is no synchronization. This value should onlybe less than 15 seconds when the opposite end is definitely a device with G.722 stat. framing.• To make the new values effective, click on “OK”.


Configuration


5.1.12. Switch Dual Mode On/OffDual Mode must be switched on if bilingual sound is to be transmitted or if a completely separatetransmission is to be made to different destinations over two channels. To switch Dual Mode onor off, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select MISCELLANEOUS and press *). The MISC mask appears.

Figure 48: The MISC mask

• Select DUALMODE with the and *) keys and press *).

• Enter the desired value with the and *) keys and press *).• To end press the *) key.(b) Via the remote control software:• To switch the Dual Mode on or off, select SETTINGS OTHERS in the remote control

software. The following dialog window opens:

Figure 49: Additional settings

• Select the desired value under “Dual Mode at B-channel”.• To make the new value effective, click on “OK”.

For Dual Mode only mono and sample rates <= 32 kHz can be used.




5.1.13. Set Digital Audio Out Sync. To synchronize the CENTAURI with the devices it is connected to, you can set which way theCENTAURI should synchronize itself,

This setting is only possible via the front panel, and not via the remote software:

• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup maskappears.

• Select DIGITAL AUDIO OUT SYNC and press *). The DIGITAL AUDIO OUT SYNCmask appears.

Figure 50: The DIGITAL AUDIO OUT SYNC mask

• Press *). A list of possible selections appears.• Select the appropriate value for “Source” with the and *) keys.

• Press *).Press the *) key to end.


Configuration


5.1.14. Set Signal Type of the Audio In/OutIf necessary you can set the signal type of the audio in or out. The following are available– analog– s/pdif– toslink– aes/ebu– adat12– adat34– adat56 and – adat78.

(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select AUDIO IN-OUT and press *). The AUDIO IN-OUT mask appears.

Figure 51: The AUDIO IN-OUT mask

• Select the audio in or audio out with the and *) keys and press *).

• Select the desired parameter with the and *) keys and press *).• To end press the *) key.(b) Via the remote control software:• Select SETTINGS AUDIO. The following dialog window opens:

Figure 52: The AUDIO SETTINGS dialog window

• Select the desired respective parameter under SOURCE or DESTINATION.• To make the new parameter effective, click on OK.




5.1.15. Set Mono MixIf required you can set the mono mix of the Audio In or Out. The following are available– MIXED/STEREO– LEFT and – RIGHTIf MIXED/STEREO is selected for Input, the signal of the right Input is mixed with the left Inputand passed on to the encoder, with the selection LEFT or RIGHT only the selected Input is used.

The setting MIXED/STEREO for the Output means that the signal is available on both outputs, ifLEFT or RIGHT are used the signal is only output on the selected channel.These settings are only effective if the encoder and/or decoder is set to mono.(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select MONO CHANNEL MIX and press *)). The MONO CHANNEL MIX mask appears.

Figure 53: The MONO CHANNEL MIX mask

• Select the Audio Input or Audio Output with the and *) keys and press *).

• Select the desired parameters with the and *) keys and press *).• To end press the *) key.(b) Via the remote control software:• Select SETTINGS AUDIO in the remote control software. The following dialog window

opens:


• Select the desired parameter under “In Channel” or “Out Channel”.• To make the new parameter effective, click on “OK”.


Configuration


5.1.16. Adjust Clipping LevelYou can change the input and output level on the CENTAURI to adjust it to the required level ofthe connected device. The CENTAURIs are fitted with an analog 18 dBu in/output level, in other words, an analog signalwith a level of 18 dBu uses up the digital resolution completely, higher levels lead to overdrive.Adjusting the input level means that the digital full level control is not first reached with a value of18 dBu but already with a newly set value. This makes the input more sensitive.Adjusting the output level has the effect that a digital signal with full level control does notgenerate 18 dBu but just a signal with the set value.To adjust the clipping level, proceed as follows:(a) Via the front panel:

– Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup maskappears.

• Select ANALOG LEVELS and press *). The ANALOG LEVELS mask appears. In this theparameter “In-Out” are already marked.

Figure 55: The ANALOG LEVELS mask with fixed or adjustable level

• Press *).

• Select the Input or the Output with the and *) keys and press *).

• Select the parameter “Level” with the *) key and press *).The following appear in the “Level” selection menu:

+18 dBu+15 dBuadjust

• With the and *) keys select whether you want to select the fixed level to +15/ 18 dBu or

set the level manually and press *).• If you have selected “Adjust”, mark the option “Adjust” with the and *) keys and press

*). Now you can adjust the level to the desired value between 0 and 18 dBu with the and*) keys. End the adjustment with *).

• To end press the *) key.


or



(b) Via the remote control software:• Select SETTINGS AUDIO in the remote control software. The following dialog window

opens:


• Set the desired level with the mouse under “Input Clipping” or “Output Clipping”.• To make the new level effective, click on “OK”.

5.1.17. Set Number Of COM Ports To Be CheckedAfter the program is started the remote control software automatically requests the set number ofCENTAURIs connected to serial COM ports. In delivery condition only COM ports 1 and 2 arerequested. The number of COM ports to be requested can however be increased to up to 8. Tochange the number of COM ports to be requested, proceed as follows:• Select EXPERT OPTIONS in the remote control software. The following dialog window

opens:

Figure 57: The OPTIONS dialog window

• Click on the drop-down list next to “Max. Number Com Ports to Scan”, and select the desirednumber.

• To make the setting effective, click on “OK”.

5.1.18. Setting the ADAT InterfaceADAT interface settings are already included in the software for future applications. CENTAURIdevices are not currently equipped with this interface. For this reason, the “Audio Settings” and “ADAT Mastermode on/off” menu items are notcurrently functioning.

Configuration


5.1.19. Display Hardware Equipment at Program StartAfter the program starts, the remote control software automatically displays the hardwareequipment available in the CENTAURI if the corresponding option has been set. To switch thedisplay option on and off, proceed as follows:• Select EXPERT OPTIONS in the remote control software. The following dialog window

opens:


• Click the control box next to “Show Hardware Status at Start”, a tick in the control box means“display on”, no tick means “display off”.


5.1.20. Switch Progress Display On/Off If the main window of the remote control software contains the input focus, the encoder and thedecoder are usually requested. The progress of this check is displayed in a dialog window. Thisprogress display can be switched off. To switch this display option on or off, proceed as follows:• Select EXPERT OPTIONS in the remote control software. The following dialog window

opens:


• Click the control box next to “Enhanced Status Messages”, a tick in the control box means“display on”, no tick means “display off”.




5.1.21. Switch Disconnect Dialog On/OffThe remote control software gives you the option of ending all existing connections or also justindividual connections with a “Disconnect”. The “Disconnect” always ends all existingconnections. To switch the selection on or off, proceed as follows:• Select EXPERT OPTIONS in the remote control software. The following dialog window

opens: Figure 60: The OPTIONS dialog window

• Click the control box next to “Enable Disconnect Dialog”, A tick in the control box means“display on”, no tick means “display off”.


5.1.22. Release Software Module The following software modules can be released:– SNMP: Order Number CSW01– only CENTAURI 3000/3001: Linear Audio via IP (CSW02)– only CENTAURI 3000/3001: MPEG 4 AAC Low Delay– only CENTAURI 3000/3001: ADPCM 4SB (Micda)You can obtain the respective release codes on order from Mayah Communications after statingyour CENTAURI serial number.When you have received the release key code for the desired software module, enter it asfollows: • Select EXPERT SET KEY CODE in the remote control software. A dialog window opens in

which you must enter the release key code.

Figure 61: The KEYCODE dialog window

• After making the entry, click on “OK”.This completes the release process.

Configuration


5.2. Communication ProfilesA communication profile contains several settings for the encoder/decoder, like sample rate, bitrate etc., that are, besides the destination address, necessary for establishing a connection.These settings are described in more detail in section "Individual Parameters" on page 33. Thecomplete encoder/decoder settings can be stored in the profile list under any name you wish.Communication profiles are of importance in establishing a connection to a communicationpartner. This is why every entry in the phone book is linked with a communication profile. Severalphone book entries can be linked with the same communication profile. No phone book entry canbe created without stating the communication profile.When creating phone book entries, communication profiles are selected and used via a cor-responding drop-down list (see section "Create Entry" on page 28 ff.).'The communication profiles are stored along with the phone book entries (see section "SavingPhonebook on a PC " on page 27). You can also transfer the communication profiles back to aCENTAURI and use the entries there (see section "Transfer phone book to CENTAURI " on page27). Once you have created a communication profile file you can distribute the samecommunication profile file to as many CENTAURIs as you wish.

5.2.1. Compile and Save Communication ProfilesTo compile and save a communication profile, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select NEW PROFILE ENTRY and press *). The following mask appears:

Figure 62: The NEW PROFILE mask

• If you want to save the current setting of the device, you just need to enter a name for theprofile. All the current device settings are automatically entered when the mask is opened.

• If you want to save a setting that is different from the current setting, set the necessary valuesusing the arrow keys. Then assign the profile a name.

• Save the communications profile by pressing the *) key and acknowledge the query

message with OK by pressing the *) key.(b) Via the remote control software:• Select EXPERT PROFILES and enter the Super-User password. A dialog window opens

with the already existing profiles.• Click on NEW or press the “insert” key. A further dialog window will then open. In the simplest

case you only need to assign a name.• To save click on OK. The profile is then saved.


Communication Profiles


5.2.2. Edit communication profilesTo edit a communication profile, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select EDIT PROFILE and press *). A list appears that contains all the profiles from whichthe profile to be edited can be found.

• Select the communication profile to be edited and press *). Then the same mask appears asin Figure 62 on page 55.

• Alter the desired setting values using the arrow keys.• Save the communications profile by pressing the *) key and acknowledge the device query

message with OK by pressing the *) key.(b) Via the remote control software:• Select EXPERT PROFILES. • Enter the Super User password (see also section "Remote Control Software Superuser

Password " on page 79). A dialog window appears with the existing communication profiles.• Select the profile to be edited and double-click on the corresponding line or press on the “E”

key. This leads to another dialog window opening.• Alter the desired parameters in this window. • To save, click OK in both of the windows.

5.2.3. Delete communication profileCommunication profiles can only be deleted when they are not used in any of the phone bookentries.

To delete a communication profile, proceed as follows:(a) Via the front panel:• Select the SETUP option in the Start mask (see Figure 6 on page 10). The Setup mask

appears.

• Select DELETE PROFILE ENTRY and press *). A list of all profiles appears.

• Select the communication profile to be deleted and press *).

• Respond to the security query with OK by pressing the *) key.(b) Via the remote control software:• Select EXPERT PROFILES. Enter the Super User password. A dialog window with the

existing profiles and their parameters opens.• Select the profile to be deleted.• Click on DEL or press the “delete” key.• To delete, click OK.


Configuration


5.2.4. Save communication profile on the PC The communication profiles are saved along with the phone book entries (see section "SavingPhonebook on a PC " on page 27).

5.2.5. Transfer communication profile file to the CENTAURI You can also transfer the communication profiles along with the phone book entries from the PCto a CENTAURI again and use the entries there (see section "Transfer phone book toCENTAURI " on page 27).When the transfer is made, the existing communication profiles are overwritten in the CENTAURI

Communication Profiles


Connections/Transmissions


6 Connections/Transmissions

CENTAURI Gateways can set up connections to other communication partners on their own.They can also accept incoming calls automatically.

6.1. Automatic Acceptance of CallsCENTAURI Gateways accept incoming calls automatically and synchronize themselves with thestation calling corresponding to the configuration.When a call comes in, the “Connection Setup” mask appears in the display for a short time. Whenthe connection is made the connection data with respect to the opposite end is displayed in thismask as a protocol.

Figure 63: The CONNECTION SETUP mask

If you are just making settings or entries, you can end the display of this mask with *). The maskwill however disappear again on its own after a few seconds. Exactly the same display conditionis then regenerated as it was prior to the Connect Report. An editing procedure in progress willnot be discontinued if a connection is set up from outside.


Prepare Connection/Transfer


6.2. Prepare Connection/Transfer

6.2.1. Mix Input Signals and Adjust Level Before you set up the connection to your communication partner, we recommend that you setthe signals to be transmitted suitably.

6.2.2. Select the correct bit rateCENTAURI Gateways support the procedures G.711, G.722, Layer 2, Layer 3, AAC, MPEG 4AAC Low Delay and ADPCM 4SB (see table below), which behave very differently as far asquality and the required bit rate is concerned. Particularly in the case of coding standards basedon a psycho-acoustic procedure such as L2, L3 and AAC, there is no longer the directrelationship between audio bandwidth = sampling rate / 2. Rather more, when using MPEGstandards it is necessary to find the best compromise for the audio bandwidth for each com-bination of a bit rate with an sampling rate and a mode. This particular applies with respect to thevery low data rates, since the maximum bandwidth can always be used for high data rates. Furthermore, the sampling rate with which the encoder algorithm works does not automaticallycorrespond to the sampling rate with which the digital AES/EBU input has to work. In order toadapt the CENTAURI to e.g. a 96 kHz studio environment in this case, the devices havesampling rate converters. It is thus possible to set the sampling rate of the encoder to theoptimum value for the transmission procedure and bit rate independent of the environment.How the sampling rate and the bandwidth of a monophonic signal at a bit rate of 64 kBit/s relateto each other, for example in the case of Layer 2, is shown in the following table:

Sampling rate (kHz) 16 24 32 48

Bandwidth (kHz) with Layer 2 7.5 10.25 9.0 8.25

You can see that the best sound quality with Layer 2 is achieved with a sampling rate of 24 kHz.At a higher sampling rate, the available bandwidth is reduced even more. If a specification statesa bandwidth of 20 kHz at a data rate of 64 kBit/ s and a sampling rate of 48 kHz, the bestpossible sound quality is not to be expected.If you want to find out more about these relationships, we recommend you study the appropriateliterature on the subject.The following sampling rates are recommended as a matter of principle:

Mono Stereo

64 kBit/s 128 kBit/s 64 kBit/s 128 kBit/s 192 kBit/s 256 kBit/sG.711 8 kHz - - - - -G.722 16 kHz - - - - -Layer 2 24 kHz 32 kHz 16 kHz 32 kHz 48 kHz 48 kHzLayer 3 32 kHz 32 kHz 24 kHz 32 kHz 48 kHz 48 kHzAAC 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz 48 kHzMPEG 4 AACLow Delay*) 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz 48 kHz

ADPCM 4SB*)

- 32 kHz - - - 32 kHzStand. APT-X 16 kHz 32 kHz 8 kHz 16 kHz 24 kHz 32 kHzEnh. APT-X 16 16 kHz 32 kHz 8 kHz 16 kHz 24 kHz 32 kHzEnh. APT-X 20 12,8 kHz 25,6 kHz 12,8 kHz 19,2 kHz 25,6 kHzEnh. APT-X 24 10,67 kHz 21,3 kHz 10,67 kHz 16 kHz 21,3 kHz

*) if released



6.3. Set up Connection

(a) Via the front panel:Connections can be established with communications partners in two different ways: either viathe start mask and the connect function, or by means of abbreviated dialling.

1) Establishing a connection via the start maskIn order to set up a connection to a communications partner via the start mask, proceed asfollows:

• Select the CONNECT option in the Start mask with the arrow key and press *). The followingmask now appears on the display:

Figure 64: The CONNECT-DIALOG mask

• Select either DIRECT DIAL (enter telephone number directly), LAST (set up the previousconnection again) or PHONE BOOK (select subscriber from the phone book).If you have selected LAST, the device immediately starts establishing the connection.

• Otherwise you should enter the desired phone number (DIRECT DIAL) or select asubscriber from the phone book.

In the phone book you enter a letter with the letter keys and the list then skips to the first entrystarting with the letter entered. The device then begins to establish a connection to the desired communications partner.

2) Establishing a connection by means of abbreviated diallingIn order to establish a connection by means of abbreviated dialling, proceed as follows: • Press the key. The SPEED DIAL mask appears.

Figure 65: The SPEED DIAL mask

This function is not available if configuration functions are currently being used at the Centauri(e.g. parameter settings for the audio encoder, scrolling through journal entries etc.).

• Press the *) key.• Enter a number at the keypad with a maximum of two digits which has been assigned to

phone book entry and press the *) key.

• Select CONNECT and press the *) key.The device now establishes a connection to the corresponding communications partner.


Set up Connection


(b) Via the remote control software:• Click on CONNECT or press the “C” key (enter phone number direct) or click on PHONE

BOOK or press the “P” key (select subscriber from the phone book). One of the followingdialog windows opens, depending on the selected data interface:

Figure 66: The CONNECT DIALOG window with various selected interfaces

• Select the desired parameter in the dialog window.• Click on OK.The device then starts to set up the connection to the desired communication partner.You can follow this process on the CENTAURI’s display in the CONNECTION SETUP or in thewindow of the remote control software:

Figure 67: The CONNECTION SETUP maskAfter the connection has been set up successfully, the device switches to the mask that wasdisplayed beforehand. If you want to monitor the existing connection, select STATUS (see thefollowing section “Execute and Monitor Transmission”).



6.4. Execute and Monitor Transmission During the transmission you can check and monitor the status of the connection at any time. (a) On the LC Display on the front panel• To check and monitor the status of a connection, select STATUS in the Start mask (see

Figure 6 on page 10) and press *). The modulation display then appears:

Figure 68: Modulation display: The right-hand edges of the barsindicate the current value.

Specific values: Depite of the normal scala which accent the DB-values in steps of five, thereare two particular values diplayed: -9 dB : normally used headroom

-18 dB : with 18 dBu fullscale (default Centauri setting),–18 dBf is equal to 0 dBu

Since not all the information relating to a connection can be displayed on the LC display at thesame time, the various pieces of status information are spread across several masks. Youcan cause these masks to be displayed one after another using the left or right arrow keys.The name of the connection is always displayed in the footnote (phone book entry, number ofthe ISDN line or network name):

Figure 69: Encoder status

Figure 70: Decoder status

Figure 71: Communication channels configured for the connection

Note: The values of the encoder/decoder currently in operation are normally shown in thestatus display on the front panel. If there is no framing, the values configured in the setupare displayed.


Execute and Monitor Transmission


(b) In the remote control software window

The status of the current existing connection is always displayed in the window of the remotecontrol software:

Figure 72: Remote control software status display

Black: timeGreen: connection time without synchronizationRed: connection time with synchronization

Number of remote terminalName of phone book entry

(if exists) Lines used

Connection Status

Name of local Centauri

Local setting

Dependency

Synchronization display



6.5. IndicationsThe CENTAURI Gateways are able to react to internal and external events.There is more about this topic on page 10.

6.6. Cut ConnectionYou can cut an existing connection at any time. (a) Via the front panel:

In order to break off an existing connection, proceed as follows:

1) Via the start mask

• Select CONNECT in the start mask (see Figure 6 on page 10) and press the *) key.

• Now select DISCONNECT and press the key once again.

2) Via the speed dial key

• Press the *) key. The SPEED DIAL mask appears.

Figure 73: The SPEED DIAL mask

• Select DISCONNECT and press the key once again.The connection is broken off immediately. All of the channels utilized by the connection areclosed, i.e. both B channels of a two-channel ISDN connection.

(b) Via the remote control software:• To cut an existing connection, click DISCONNECT in the program window. The connection is

cut off immediately. All the channels belonging to a connection are closed, i.e. in the case of atwo-channel ISDN connection, both B channels.

Figure 74: Disconnect dialog mask, if several connections exist

Note: One separate connection can be displayed up to a maximum of 49.7 days (this valuedepends on the type of cardinal variable in which it is stored, exactly 2 32 – 1 ms).


Connection Protocol


6.7. Connection ProtocolYou can cause the connection protocol (Journal) to be displayed on the display.(a) On the LC display on the front panel

• Select MISC in the Start mask (see Figure 6 on page 10) and press *).

• Select JOURNAL and press *).The journal now appears on the display:

Figure 75: Journal

The connection direction is displayed well as date and time (for display format see section "SetTime, Date and Date Format " on page 24). The symbol ‘>' means outgoing call (CENTAURI hascalled), and the symbol ‘<' means incoming call (CENTAURI was called).

The address of the partner is displayed behind it. If the device has found the address in thephone book it displays the name of the entry or the address itself.

If you select a list entry with or *), and press *), more information about this connectionwill appear on the display. Where there is a greater amount of information you can page bypressing or *).

Figure 76: Information about the selected connection (example)

(b) In the remote control software window Prerequisite: IP controlThe log file can be called up with the menu item <File/Display Log File>. In the menu item<Expert/Options> it is also possible to set whether the log file is displayed – simply (only connection set up and cut off) or– in detail.

Figure 77: The LOGFILE dialog window


Internet Protocol


7 Internet Protocol So that this handbook is not more extensive than absolutely necessary, we assume basicknowledge about the Internet Protocol (IP). If you are not familiar with the topic “InternetProtocol”, we recommend you refer to the appropriate literature on the subject.

Every CENTAURI Audio Gateway has a network interface card with a 10Base-T/100Base- TX-RJ-45 connection. The connection configures itself to the existing network speed (10 or 100MBit/sec).The CENTAURI gateways support the Internet Protocol, either connection-orientated (TCP) orwithout connection (UDP) as a protocol on the network.

You can find more detailed descriptions of the various protocols in the “Glossary” on page 83.

All device types from the CENTAURI family can be remote controlled via the network interface.The devices of the CENTAURI 3000 series also permit the transport of digital audio signals viathe network interface.Each CENTAURI gateway can be connected to a normal local Ethernet via the network interface.Apart from the physical connection it is only necessary to enter the unique IP address.

7.1. Remote Control via IPFor management and control functions the CENTAURI gateways provide two different protocols:– In the simplest case a TCP/IP connection is set up with a PC on which the remote control

software provided runs. The data exchange is achieved via a simple IP Port Protocol. Thisprotocol can also be used for the development of more complex control systems.

– For the integration into network structures, CENTAURI gateways can be connected by meansof a management interface via the SNMP(v1) (Simple Network Management Protocol). Forthis the gateway acts as 'Agent', i.e. a manageable device in the network. Information aboutthe current status of the device and the individual interfaces can be requested via SNMP. Thegateway can also trigger a network report (Trap) when a particular, predefined event occursthat can be received and evaluated by the management system.

7.2. Digital Audio via IPBesides the monitoring and management functions, the CENTAURI Gateway 3000 family alsoprovides the possibility of audio transport via IP.This means, for example, that a signal lying at the audio input can be transmitted into the networkusing an TCP or UDP.

In the average case of audio data transport via IP, one IP-packet carries exactly one audio frame.Depending on frame length and packet size there is a specific overhead in each IP-packet. Anexception can occur if the data transport isn’t working correctly due to different possible reasons,e.g. network problems. In this situation, if the IP-packets are refused and have to be sent again,the audio frames are allocated to the IP packets in a different way.

Digital Audio via IP


7.2.1. One IP-packet carries more than one frameThis would be the normal way of audio transport in a situation described above. As you can seein the following figure, the first IP-packet carries not only the first audio frame but also parts of thesecond one. The second IP-packet carries the rest of Audio 2 and parts of Audio 3. IP-packet 3carries the rest of Audio 3 and Audio 4 etc..

7.2.2. One frame is carried by more than one IP-packetIn specific situations, e.g. if the bit rate is high and the sample rate is low, the frame length can belarger than the packet size. In this case the first IP-packet would only carry parts of the first audioand IP-packet 2 the rest etc..In both situations it is necessary to get access to the frame header to be able to read theinformation about frame length, bit rate, sample rate etc.. How to get this information is dealt within the following chapter.

Audio 1 Encoder

Decoder

Transport

Audio 2 Audio 3 Audio 4

Audio

Audio

Audio 1 Audio 2 Audio 3 Audio 4

IP IP packet 1 IP packet 2 IP packet 3 IP packet 4

Audio 1 Audio 2 Audio 3 Audio 4

Internet Protocol


7.3. Header informationThe structure of the headers for MPEG Layer2/3, AAC/CT-aacPlus and AAC Low Delay aredescribed in the following chapters.

7.3.1. MPEG Layer 2 / Layer 3 frame header {++++ ++++ ++++-------------------------- Synch |||| |||| |||| +------------------------ Ident |||| |||| |||| |++---------------------- Layer |||| |||| |||| |||+--------------------- Protection |||| |||| |||| |||| ++++---------------- Bitrate |||| |||| |||| |||| |||| ++------------- SamplFreq |||| |||| |||| |||| |||| ||+------------ Padding |||| |||| |||| |||| |||| |||+----------- Private |||| |||| |||| |||| |||| |||| ++-------- Mode |||| |||| |||| |||| |||| |||| ||++------ Modeextension |||| |||| |||| |||| |||| |||| |||| +---- Copyright |||| |||| |||| |||| |||| |||| |||| |+--- Original/Copy

|||| |||| |||| |||| |||| |||| |||| ||++- Emphasis |||| |||| |||| |||| |||| |||| |||| ||||}HEADER_MASK = $FFFE0000;{1111 1111 1111 1110 0000 0000 0000 0000}HEADER_MPEG1 = $FFFC0000;{1111 1111 1111 1100 0000 0000 0000 0000} HEADER_MPEG1_L3 = $FFFA0000;{1111 1111 1111 1010 0000 0000 0000 0000}HEADER_MPEG2_L2 = $FFF40000;{1111 1111 1111 0100 0000 0000 0000 0000}HEADER_MPEG2_L3 = $FFF20000;{1111 1111 1111 0010 0000 0000 0000 0000}HEADER_MPEG25_L = $FFE20000;{1111 1111 1110 0010 0000 0000 0000 0000}

SAMPLFREQ_MASK = $00000C00;{0000 0000 0000 0000 0000 1100 0000 0000}BITRATE_MASK = $0000F000;{0000 0000 0000 0000 1111 0000 0000 0000}PADDING_MASK = $00000200;{0000 0000 0000 0000 0000 0010 0000 0000}MODE_MASK = $000000C0;{0000 0000 0000 0000 0000 0000 1100 0000}MODE_EXT_MASK = $00000030;{0000 0000 0000 0000 0000 0000 0011 0000}PROTECTION_MASK = $00010000;{0000 0000 0000 0001 0000 0000 0000 0000}PRIVATEBIT_MASK = $00000100;{0000 0000 0000 0000 0000 0001 0000 0000}

7.3.2. AAC/CT-aacPlus-Header {++++ ++++ ++++-------------------------- Synch |||| |||| |||| +------------------------ Ident |||| |||| |||| |++---------------------- Layer |||| |||| |||| |||+--------------------- Protect. absent |||| |||| |||| |||| ++------------------ Profile |||| |||| |||| |||| ||++ ++------------- SamplFreq |||| |||| |||| |||| |||| ||+------------ Private |||| |||| |||| |||| |||| |||+ ++-------- Chan.Configur. |||| |||| |||| |||| |||| |||| ||+------- Origin./Copy |||| |||| |||| |||| |||| |||| |||+------ Home |||| |||| |||| |||| |||| |||| |||| ||||}HEADER_MPEG2_AAC = $FFF80000;{1111 1111 1111 1000 0000 0000 0000 0000}PROTECTION_MASK_AAC = $00010000;{0000 0000 0000 0001 0000 0000 0000 0000}PROFILE_MASK_AAC = $0000C000;{0000 0000 0000 0000 1100 0000 0000 0000}SAMPLFREQ_MASK_AAC = $00003C00;{0000 0000 0000 0000 0011 1100 0000 0000}PRIVATEBIT_MASK_AAC = $00000200;{0000 0000 0000 0000 0000 0010 0000 0000}MODE_MASK_AAC = $000001C0;{0000 0000 0000 0000 0000 0001 1100 0000}ORIGINAL_MASK_AAC = $00000020;{0000 0000 0000 0000 0000 0000 0010 0000}HOME_MASK_AAC = $00000010;{0000 0000 0000 0000 0000 0000 0001 0000}

7.3.3. AAC Low Delay {++++ ++++ +++--------------------------- Synch |||| |||| |||+ ++++ ++++ ++++----------- Length |||| |||| |||| |||| |||| |||| +--------- samestream |||| |||| |||| |||| |||| |||| |+-------- audio mux vers. |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| ||||}HEADER_MPEG4_AAC_LD = $56E00000;{0101 0110 1110 0000 0000 0000 0000 0000}HEADER_MASK_AAC_LD = $FFE00000;{1111 1111 1110 0000 0000 0000 0000 0000}LENGTH_MASK_AAC_LD = $001FFF00;{0000 0000 0001 1111 1111 1111 0000 0000}

HTTP streaming over IP


7.4. HTTP streaming over IP

7.4.1. HTTP StreamingIn loop-mode operation the Centauri 300x is able to generate one audio stream (encoder) whichcan be executed by HTML command files stored in the WWW directory of the Centauri. It can beactivated from any web client or media player. Note: For streaming with the Centauri 4001 StreamingServer see chapter 10.6, HTTP Streamingwith the Centauri StreamingServer.

7.4.2. Structure of HTTP Command FilesThe HTML command files have a strictly defined structure (see also sample files): Syntax:



Parameters:Param1: [SlotNr]

Param2: [Algorithm]

Param3 [Samplerate]

Param4: [Bitrate]

Param5: [Mode]

– SlotNr defines the encoder slot that should run the requested algorithm. This value has tobe 1 for Centauri 300x, for there is just one slot available.

– Algorithm, Samplerate, Bitrate and Mode must be used as defined in the encoder sec-tion of the Centauri Gateway, Communication Reference Manual.

Streaming with different sample rates does not function correctly unless the rates are multiplesof the running sample rates. Example: A mix of 32 and 48 kHz does not work. A mix of 8, 16,and 32 kHz or a mix of 8, 16 and 48 kHz works well.

Sample files:Stream1.htm:



Stream2.htm:

7.4.3. Generating HTTP Command FilesA HTTP command file can be generated with any common text editor. It contains one line usingthe structure described above. Additional lines are not read. The file can be saved under anyname with the .htm extension. After generating the command file, it has to be transferred by anFTP client program to the D:\www\ folder at the Centauri, where it is made available via the net.

Internet Protocol


7.4.4. Executing HTTP Command FilesThe execution of the command file can be activated by any web client or media player which ispart of the net. The following structure must be used:

http://[Centauri-address or name]/[command file-name. exten-sion(irrelevant)]

Example:http://10.0.0.255/stream.mp3

http://CentauriExa/stream.wav

http//Centauri-address or name/ activates a search in the www folder of the addressed Centauri.The name of the command file is only significant for searching. The extension only defines howthe data should be interpreted. This option makes it possible to execute different formats fromany web browser, which is important for HTML programming.Example: An HTTP request to STREAM1.mp2, STREAM1.wav or STREAM1.mp3 from a webbrowser is executed by the web server by the STREAM1.htm HTTP command file.All HTTP requests start an audio stream/encoder with the requested parameter, if no other audiostream/encoder is currently active. After the last HTTP request has been executed by the webclient/player, the audio stream/encoder is stopped.

HTTP streaming over IP


Troubleshooting


8 Troubleshooting8.1. Monitor Device Condition

If any problems arise with the CENTAURI, it is recommended that you first check the device’soperational data. For this purpose the device displays the operational data.(a) Via the front panel:

Figure 78: System monitor

Figure 79: Versions

To display one of these masks, proceed as follows:

• Select the MISC option in the Start mask (see Figure 6 on page 10) and press *).

• Select SYSTEM HEALTH or VERSIONS and press *).• To close the respective mask again, press *).(b) Via the remote control software:

The remote control software provides a range of operational and device data displays. Thesecan be accessed via the menu in the main window.

• Select STATUS <desired dialog window>. The following dialog windows are offered:– CENTAURI Identification; change of entry is possible;– CENTAURI Time; change of entry is possible;– CENTAURI Software Versions– CENTAURI Hardware and – CENTAURI Health; a tick in the control box means: value in permissible range. The

display is not updated

Figure 80: Operational and device data displays


Update Device Software


8.2. Update Device SoftwareYou can update your device software via ISDN, via the RS232 interface or via the Ethernetinterface. If there is a connection to the internet, the current CENTAURI software can be down-loaded into the device from the Mayah web site direct.The update process only takes a few minutes, via Ethernet or house network (if present) only afew seconds.Afterwards the device boots itself again automatically, and the new software is then alreadyavailable.The result is shown on the display. It can also be recognized (e.g. also by the device versionswithout display) by the lighting up of the LED’s:– ALARM LED flashes: 0 - 25% transmitted– OVERLOAD LED flashes: 26 - 50% transmitted– CONNECT LED flashes: 51 - 75% transmitted– FRAMED LED flashes: 76 - 100% transmitted– All LED’s flash: Internal updating after complete transmission

8.2.1. Request of the Current Version StatusYou can let the version data of the system components be displayed. To do this you shouldproceed as follows:(a) Via the front panel:


• Select VERSIONS and press *). A series of system data will then be shown on the display:

Figure 81: System component version data

• To end the display, press *).


Troubleshooting


(b) Via the remote control software: Select EXPERT CENTAURI SOFTWARE. A windowopens with the desired data:

Figure 82: System component version data

• To close the window again, click on “OK”.

8.2.2. Software Updating via ISDNTo update the CENTAURI software via ISDN you must set up an ISDN connection to theCENTAURI server. If there is a new software version for the device that is calling, the updatingroutine will start when you press the key and the update file will be transmitted to your device.To update the software via ISDN, proceed as follows:(a) Via the front panel:


• Select SYSTEM UPDATE and press *).

Figure 83: System Update

• Enter the ISDN phone number of the CENTAURI server (in Germany: 0811/ 5516-61).

• Select START UPDATE and press *).The update routine now runs automatically.

(b) Via the remote control software:• Select EXPERT UPDATE CENTAURI VIA ISDN. A dialog window opens.• Select the desired software version if necessary. “Newer” means that it should be updated

with a newer software version than is present in the CENTAURI. It is of course also possibleto downgrade.

• Enter the ISDN phone number of the CENTAURI server.• Then click on “OK”.

The update routine now runs automatically.


Update Device Software


8.2.3. Updating via FTPTo update the CENTAURI software via RS232/Ethernet interface you have to use the remotecontrol software. Prerequisite is that it is possible to control from the PC via IP.• Select EXPERT UPDATE CENTAURI VIA RS232/FTP/INTERNET. A dialog window

opens.• Click on “OK”. A Windows dialog window then opens the file manager /Explorer.• Select the desired list, then the desired software file (“*.upd”) and then click on “OK”.

When updating via the Internet, the remote control software itself sets up a connection to theInternet via the data transmission network of the PC.

The updating routine then runs automatically. The progress of the update is displayed.

8.2.4. Updating via InternetTo update the CENTAURI software via RS232/Ethernet interface you must use the remotecontrol software. Prerequisite is that it is possible to control from the PC via IP and there is anInternet connection.• Select EXPERT UPDATE CENTAURI VIA RS232/FTP/INTERNET. A dialog window

opens.• Click on “OK”. A Windows file manager/Explorer dialog window opens.• Select the desired list and then the desired software file (“*.upd”).• Click on “OK”.

When updating via the Internet, the remote control software itself sets up a connection to theInternet via the data transmission network of the PC.

The updating routine then runs automatically. The updating progress is displayed.

8.2.5. Updating via the RS232 Remote PortTo update the CENTAURI software via RS232Remote Port you have to use the remote controlsoftware. Prerequisite is that a control is possible from the PC via RS232.• Select EXPERT UPDATE CENTAURI VIA RS232. A dialog window opens.• Click on “OK” in the dialog window. A Windows file manager/Explorer dialog window opens.• Select the desired list and then the desired software file (“*.upd”) and click on “OK”.The updating routine then runs automatically. The updating progress is displayed.

Troubleshooting


8.3. Remote Control Software Registry Entries It can also be necessary to intervene in the registry directly in order to enter the CENTAURI’s tobe controlled. In such a case, proceed as follows:• Open the group

“HKEY_CURRENT_USER\Software\Mayah Communications\Centauri remote” in theWindows registry

• Create a new sub-registry with the name “IP”.• Create three new keys in the sub-registry “IP” with the names

– Address– IPControl– Port

• If more than 1 CENTAURI is to be controlled, create an own key for each further CENTAURIto be controlled in the group “IP” in addition to “Address” with the name – Address1 (for the first CENTAURI)– Address2 (for the second CENTAURI)– .... etc.

• Allocate the following values to the keys – Address: IP Address of your momentary CENTAURI (e.g. “10.0.0.10”)– IPControl: “TRUE” for IP Control and “FALSE” for RS232 Control– Port: '2000'

Port 2000 in the registry has nothing to do with Port 2001 that is entered in the CENTAURIunder “Network”! A change of one or both of these values results in communicationproblems!

– Address1: IP Address of the first CENTAURI to be controlled– Address2: IP Address of the second CENTAURI to be controlled– .... etc.

• Please take into account:– All entries are “case sensitive”. In other words, a strict difference is made between higher

and lower case for all entries.– The IP Address must correspond to the subnetwork mask of your network.

The following entries exist:

a) HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote– Baud rate: Baud rate with RS232 Remote Control

Type: Character series – ComPort: Com Port with RS232 Control;

Type: Character series, in capitals– MaxComPorts: Number of Com Ports to be scanned with RS232 Control

Type: DWord, Basis: Hex– SuperUserPassword:

Type: Character series a) HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\Dialogs:

– EnableDetailedLogFile:Type Character series, in capitals;TRUE = Detailed Log FileFALSE = simple Log File

– EnableDisconnect:Type Character series, in capitals;TRUE = Disconnect DialogFALSE = no Disconnect Dialog

– EnableHardwareStatus:Type Character series, in capitals;

Remote Control Software Registry Entries


TRUE = Hardware status is displayed at program start FALSE = Hardware status is not displayed at program start

– EnableProgressDisplay:Type Character series, in capitals;TRUE = Progress display on FALSE = Progress display off

– EnableSuperUserPassword:Type Character series, in capitals;TRUE = SuperUser password request with Expert MenusFALSE = no SuperUser password request with Expert Menus

a) HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\IP– Address:

Type Character series;Current IP Address

– Address1 to Address200Type Character series IP Addresses of CENTAURI’s still to be addressed

– IPControlType: Character series, in capitals;TRUE=IP ControlFALSE=RS232 Control

a) HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\Last DialedNumbers

This is where the last dialed ISDN numbers are saved as a character series;

Structure of the entries: <B channel>_<order of the numbers>

Example: 2_3: 3rd last dialed number of the 2nd B channela) HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\Last IP

Addresses

This is where the last dialed IP addresses are saved as a character series.a) HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\Update

– UpdateAddress:Type Character series;ISDN updating number

Troubleshooting


8.4. Remote Control Software Superuser Password The menu items of the 'Expert' menus can only be accessed after a Superuser Password hasbeen entered. This Superuser Password is defined when you first use the remote controlsoftware on your C for the first time. The Superuser Password can be any row of characters.If you no longer know the Superuser Password, it is easy to find it out. It is stored in the registryunder:HKEY_CURRENT_USER \ Software \ Mayah Communications \ Centauri Remote \SuperUserPassword.

Switch off Superuser Password Protection You can switch off the protection provided by the Superuser Password. • Select EXPERT OPTIONS. The following dialog window then appears:


• Click on the control box beside “Enable Super User Password Dialog”, so that no tick can beseen there.

• To make the setting effective, click “OK”.The password protection is now switched off.

Remote Control Software Superuser Password


Technical Data


9 Technical DataAnalog Audio SpecificationsConnections Gold-plated Neutrik® 3-pin XLR

Input: socketOutput: plug

A/D converter 24 bit sigma-deltaSampling rates 32, 44.1 and 48 kHzInput impedance >25 kOhm, symmetricalOutput impedance <100 Ohm, symmetricalAbove control limit Input: +18.0 dBu

Output: +18 dBuHarmonic distortion <0.005% at 1 kHzSignal-to-noise ratio >95 dBSpeak-over >95 dBL/R phase difference <0.5°Coding algorithms ISO/MPEG 1, 2, 2.5 Layer III

ISO/MPEG 1, 2 Layer IICCITT G.722CCITT G.711For the CENTAURI 3000/3001 also: MPEG-2 AAC

optional: – ADPCM 4SB, – CT-aacPlus, – Standard and enhanced apt-x and – MPEG 4 AAC Low Delay

Data Interface SpecificationNetwork Interface Cards ISDN BRI (2B+D)Number of B channels Up to 8Data rates Layer III: 8 to 320 kb/s in steps of 8 kb/s

Layer II:8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144,160, 192, 224, 256, 320 and 384 kb/sG.722: 48, 56 and 64 kb/s

Additional Data ChannelConnection DB9, socketBaudrate 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200

BaudMode 8 data bits, 1 stop bitHandshake Not neededTTL interfaceConnection DB25, socketFunction IndicationControl interfacesKeyboard 16 keys with cursor, dial, function and status keysLevel display Normal and clip LEDsRemote control Full function extent Interfaces RS232 or IP EthernetConnection DB9 or RJ-45 socketBit rates 9600, 19200, 38400, 57600 or 115200 bps with RS232 con

trolModus 8 data bits, 1 stop bit, no parity bit



Handshake No or XON/XOFFGeneralEnvironmental conditionsStorage temperature -40 to +70° C (-40 to +158° F)Operating temperature 5 to +45° C (41 to +113° F)Relative moisture 20 to 80%, non-condensingElectromagnetic compatibility EN 50081-1, EN 50082-2Power supply 90 to 250 VAC, 47 to 65 Hz, <60 Watt

Dimensions and weightHeight 2U (3.5 in., 8.89 cm)Breadth Rack mount: 19 inches (48.26 cm)

Table version: 17,13 inches (43.48 cm)Depth 12.2 inches (30.99 cm)Net weight About 14.4 lbs. (6.6 Kg)

Device Identification NumberEach CENTAURI has its own identification number. In order to display your CENTAURI’s identification number, proceed as follows:

• Select the SETUP option in the Start mask (see Figure 6 on page 10) SETUP and press *).

• Select IDENTIFICATION and press *).The identification number now appears on the display.• To close the mask again, press *).


Technical Data


Glossary

AAC Advanced Audio Coding;Clipping level The clipping level shows when the A/D converter overdrives. In Germany a

clipping level of 15 dBu is usually used.Clipping level (15 dBu) = norm level (6dBu) + headroom (9 dBu)

FTP FTP stands for File Transport Protocol and serves the processing of filesin a network. FTP superimposes on the Transmission Control Protocol(TCP).The CENTAURI has an FTP Server that permits file access to theCENTAURI Flashmemory. This way, firmware updates can be installed onthe CENTAURIs easily and securely.

G.711 Coding procedure for data reduction; is used by all ISDN telephonesG.722 Coding procedure with a bandwidth of 7kHz (better audio quality)HTTP Abbreviation for Hypertext Transfer Protocol; works in the OSI layer 7.H.221 A protocol with which two devices swap information about which coding

procedure they master, and how the data flow is distributed in the case ofseveral ISDN lines. An ITU (Internationale Telekommunikation Union)standard to guarantee the compatibility between devices made by differentmanufacturers.

IP Internet ProtocolMultiplexing In principle there are two different procedures for multiplexing.

The first method compensates the time delay between two channels bytransmitting and measuring a test pattern. If the connection path changesduring transmission it leads to breakdowns, and it is necessary to set up aconnection again. This method is called BONDING and is mainly used in thedata communication field. In audio, principally by Dialog4, MusikTaxi, VPand VP-Pro.The second method (INVERSE MULTIPLEXING) uses a small portion ofthe data rate for semi- continuous checking of the delay. This method isused with J.52 and for CCS Audio Codecs, such as the CDQPRIMA forexample.

ISDN Integrated Services Digital Network; a service-integrated digital network.J.52 Digital transmission procedure for sound programs for high quality, that use

one, two or three 64 kbit/s channels for mono and up to 6 for stereo;MPEG “Motion Pictures Expert Group”; data format for transmission.SMTP Abbreviation for Simple Mail Transport Protocol.SNMP SNMP is the abbreviation for Simple Network Management Protocol and

represents a standardized interface for the management of network devices.All the parameters of a device can be set via this interface and all statusescan be requested. These individual parameters are referred to as SNMPobjects that are put together in the Management Information Base (MIB).The CENTAURI gateways support this protocol optionally.

TCP TCP stands for Transmission Control Protocol and organizes a securedata transfer via a network, comparable with a point-to-point connection.Every data package that is sent from the transmitter is signed for by thereceiver. If a package gets lost it will be repeated by the transmitter after aparticular interval. If a package is received incomplete or faulty, the receiverrequests it again.

AudioAnc DataAudio Audio

EncoderInvers.

Multiplexer

Anc DataAudio

DecoderInvers.Multi

plexerTransmission

Facilities T



In addition, TCP guarantees that the data packages arrive at the receiver inthe same order that they were sent by the transmitter.In CENTAURI, TCP is used as the default transport protocol for audio overIP. A TCP connection is always bi-directional, both encoder and decoder areactivated.

UDP UDP is the abbreviation for User Datagram Protocol and describes anunsecured or connectionless data transfer. UDP does not have anymechanisms for confirming data receipt, nor does it have a procedure forflow control. In other words, UDP does not guarantee that the data packagesarrive in the order they were sent in.For audio transport via IP this means that transmission security and ordermust be ensured by another network instance.UDP can be activated by inserting the letter “U” in front of the IP destinationaddress. A connection set up with UDP is unidirectional. Only the encoderon the CENTAURI doing the calling is activated.

V.35 Interface definition for greater transmission speeds and analog wide- bandmodems. Works with a data rate of 48 kbit/s and uses a mixture ofasymmetrical V.24/V.28 signals and symmetrical V.35 signals. The distanceis therefore limited to 15 m. A 34-pin plug connection is used as standard,the mechanical characteristics of which do however vary from country tocountry. Since in Centauri’s case, V.35 and X.21 use the same physical port,a 26-pin plug connection is used here.

X.21 ITU-T standard for access to digital networks. As standard, the X.21interface uses the 15-pin plug connector as per ISO 4903 for mechanicalcoupling of the interface lines. Since Centauri X.21 and V.35 both use thesame physical port, a 26-pin plug is used here.

Technical Data


Menu Tree shown on the CENTAURI Display

Connect

Status

Setup

Misc

Disconnect Direct Dial (ISDN) Last (<name>) Phonebook

Levels Encoder Decoder Lines

Versions Journal System Health System Update

Dest. 1 Dest. 2Connect!

(List of Entries)

(List of Entries)

Audio In: ... Audio Out: ...

(List of Entries)

(List of Entries)

ID: ... SN: ...

Backlight: On/Off Contrast: ...

Baudrate: ... Databits: ... Parity: ... Stopbits: ... Handshake: ...

G 711 Options Language: ... Dualmode: ... Subcodec: ... Multipoint: ...

Temp: nn °C CPU: nnn MHz Mem: nn MB Fan: nn RPM Flash: nn KB Free: nn KB

+- nn V (Volt) Address: ... Start Update!

In-Out: ... Level: ...

Interface: ...

Source: ...

Name Enc-Profile Dec-Profile Interface Dest 1 ... Dest n

Interface Address Netmask Gateway DNS Server Broadcast Port Number SNMP Server Transferrate Duplex SNMP Traps Packetsize Audio Delay

Disconnect: nn Stat. Framing: nn

Input: ... Output: ...

Source: ... Volume: ...

ADAT Mastermode

Dial ProtectionISDN Service Protec.

Manual Accept Dial Protect. ISDN Dial Protect. IP

List of Entries

G 711 G 711 Level G 711 ISDN Service

of System Compon.

Connection Entries

New Phonebook Entry Edit Phonebook Entry Delete Phonebook Entry Audio In/Out Mono Channel Mix Digital Audio Out Sync Audio Settings Audio Encoder Audio Decoder Timeouts Analog Levels Communication Interface ISDN X.21 Network New Profile Entry Edit Profile Entry Delete Profile entry Date & Time Frontpanel Headphone Identification Ancillary Security Miscellaneous

Name Type Samplerate Bitrate Mode Format Source Dependency Ancillarymode

Type Samplerate Bitrate Mode Dependency Format Ancillarymode Bandwidth (Enc.)

B Channel MSN SPID Protocol PBX PBX Digits Predial Redials Redial wait Audio Delay

Interface Mode Clock Protocol Audio Delay

Entry 1 ...Entry n



Index

A

AAC..................................................................... 83ADAT Interface ............................................. 14, 52adat12 ................................................................. 49adat34 ................................................................. 49adat56 ................................................................. 49adat78 ................................................................. 49Mix Input Signals................................................. 60aes/ebu ............................................................... 49analog ................................................................. 49Automatic Acceptance ......................................... 59

B

Baud rate ............................................................ 39Block diagram........................................................ 9

C

Clipping level....................................................... 83Communication profiles .................................... 55COM-port checking ............................................. 52Configuration ....................................................... 33Connection protocol............................................. 66Connections ......................................................... 20Copyright ............................................................... 2Cut connection ..................................................... 65

D

Data bits, number of.......................................... 39Decoder settings

Special features ............................................. 34Dial In Protection ............................................... 42Dial Protection.................................................... 42Digital audio via IP .............................................. 67Dual Mode .......................................................... 44

switch on/off .................................................... 47

E

Encoder settingsSpecial features ............................................. 34

F

First steps ............................................................. 10FTP....................................................................... 83

G

G.711 ................................................................... 83G.722 ................................................................... 83G711

level ................................................................. 44parameter.......................................................... 44

Glossary.............................................................. 83

H

H.221 ................................................................... 83Handshake procedure ...................................... 39HTTP ................................................................... 83

command files .................................................. 70streaming over IP ............................................. 70

I

Indications............................................................ 65Installation ........................................................... 18Internet protocol................................................... 67Inverse Multiplexing............................................ 83IP83ISDN.................................................................... 83ISDN adapter, configuring................................... 41ISDN Service Protection .................................. 42

J

J.52....................................................................... 83

K

Key code .............................................................. 54Key controls......................................................... 13Keyboard .............................................................. 9

L

LC-display ............................................................ 9

M

Mask display........................................................ 13Menu tree ............................................................. 85Monitor device condition..................................... 73MPEG .................................................................. 83

O

Environment conditions....................................... 19

P

Parity ................................................................... 39Phone book .......................................................... 27

Create entry................................................ 28, 55Delete entry...................................................... 31Edit entry ......................................................... 30

Prepare connection/transfer ................................. 60Program

installation........................................................ 20Program, stop....................................................... 21Protection, ISDN-Service ................................. 42

Q

Quick start............................................................ 10

R

Release software module ..................................... 54Remote control..................................................... 15Remote control via IP .......................................... 67RS232-Interface................................................... 15

S

s/pdif.................................................................... 49Scope of Delivery ................................................ 19Select correct bit rate ........................................... 60Service Identification......................................... 42Set

decoder............................................................. 36

Technical Data


encoder....................................................... 14, 33multiplexer ....................................................... 36

Set up connection........................................... 38, 61Setup .................................................................... 14SMTP................................................................... 83SNMP................................................................... 83Software, start ...................................................... 21Speed dial mask ................................................... 61Speed dialling ................................................ 12, 61Start mask............................................................. 10Stop bits .............................................................. 39Subcode.............................................................. 44Superuser password ....................................... 56, 79Switching on/off .................................................. 12

T

TCP...................................................................... 83Technical data ...................................................... 81toslink .................................................................. 49Troubleshooting................................................... 73

U

UDP ..................................................................... 84Update device software........................................ 74

V

V.35 ..................................................................... 84

X

X.21 ..................................................................... 84

Appendix


10 Appendix

Appendix


10.1. ISDN Backup for a Faulty IP Connection

10.1.1. Prerequisites• Centauri with system software 1.1.0.44 or later • PC with:

- min. Pentium 166 MHz- RAM 32 MB- Operating system Windows ’95, ’98, ME, NT or 2000- free serial port (remote control by RS232) or Ethernet card (remote control by IP)

• Zero modem cable (included in Centauri) if RS232 control is used orall necessary LAN cabling between Centauri and PC

• Centauri remote control with version 1.1.0.24 or laterNote:You can download the current the Centauri system software and the latest remote software fromMayah homepage www.mayah.com at section download.

10.1.2. Short Introduction to Centauri Event Action ProgrammingPlease consider that this is not a detailed description of how Centauri event action programmingworks. It simply aims to give you an impression of its possibilities. Generally Centauri event actionprogramming is just intended to combine events like

• Alarm on or off• Connect on or off • Framed on or off • Overload on or off • TTL input high or low

with actions. An action can be defined as a set of Centauri commands

10.1.3. Description of ISDN Backup for a Faulty IP ConnectionAfter an IP connection loses framing, an ISDN connection should be established automatically forbackup.

10.1.4. How to input all the necessary Commands to the CentauriYou can type in all the necessary commands with help of the Centauri remote control software. Justskip to remote item <Expert/Direct Command>. You may be asked for a Superuser Password . This Superuser Password is determined by the firstuse of Centauri remote on your PC. If the super user is lost you can recover it very easily. It is saved in the registry in: HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\SuperUserPassword.

How to use the direct command dialog:Just type in the Centauri command in the command edit field and confirm by pressing the ‘OK’ button.You’ll get the answer in the answer memo box.

http://www.mayah.com/

ISDN Backup for a Faulty IP Connection


10.1.5. Necessary CommandsCreate the following phonebook entry on the first CentauriTo create a phonebook entry via remote control at the first Centauri, first press the ‘PHONEBOOK’button and then the ‘NEW’ button. After this enter the following phonebook entry: Backup_ip<number of encoder profile><number of decoder profile>isdnphone number 1phone number 2..for example:

Finally, confirm the new phonebook entry by pressing the OK button.Define the action 'isdnback' at first CentauriDirect command: 'action_create isdnback com_disconnect 0;phone_execentry <number of above created phonebookentry>'Define the action 'isdnback' at second CentauriDirect command: 'action_create isdnback com_interface isdn'Event programming at first and second CentauriDirect command: 'event_set framed_off 1 isdnback connect'Save the events at first and second CentauriDirect command: 'event_save'

Appendix


10.2. ISDN Backup for Faulty X.21/V.35 Connection

10.2.1. Prerequisites• Centauri with system software 1.1.0.44 or later• PC with:


• Zero modem cable (included in Centauri) if RS232 control is used or all necessary LANcabling between Centauri and PC

• Centauri remote control with version 1.1.0.24Note:You can download the current Centauri system software and the latest remote software from thedownload section of the Mayah homepage at www.mayah.com.




10.2.3. Description of ISDN Backup for a Faulty X.21/V.35 ConnectionIf a X.21/V.35 connection loses framing, an ISDN connection should be established automatically forbackup. When the X.21/V.35 dedicated line is back, it is then necessary to hang up the ISDN line tore-establish the X.21/V.35 connection.Please note that it will not be automatically detected that the X.21/V.35 is back. The parameters of the connections in the following example are:X.21 dedicated line: MPEGL2, 256 kbit/s, 48 kHz, stereoISDN MPEGL2, 128 kbit/s, 48 kHz, joint stereo

10.2.4. How to input all the necessary Commands to the CentauriYou can type in all the necessary commands with help of the Centauri remote control software. Justskip to remote item <Expert/Direct Command>. You may be asked for a Superuser Password . This Superuser Password is determined by the firstuse of Centauri remote on your PC. If the super user gets lost you can recover it very easily. It is saved in the registry at: HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\SuperUserPassword.How to use the direct command dialog:Just type in the Centauri command in the command edit field and confirm by pressing the ‘OK’ button.You’ll get the answer in the answer memo box.


ISDN Backup for Faulty X.21/V.35 Connection


10.2.5. Necessary CommandsCreate the following phonebook entry on the first CentauriTo create a phonebook entry via remote control at the first Centauri, first press the ‘PHONEBOOK’button and then the ‘NEW’ button. After this enter the following phonebook entry: Backup_ip<number of encoder profile><number of decoder profile>isdnphone number 1phone number 2..for example:

Finally confirm the new phonebook entry by pressing the OK button.Define the action 'isdnback' at first CentauriDirect command:‘action_create isdnback event_reset framed_off 1;com_disconnect 0;com_waitmsecs3000;com_interface isdn;phone_execentry <number of above created phonebook entry>;event_setconnect_off 1 normal true’Define the action ‘normal’ at first CentauriDirect command:‘action_create normal event_reset connect_off 1;com_disconnect 0;com_waitmsecs500;com_interface x.21;enc_slave local;enc_bitrate 256000;com_waitmsecs 500;com_connect1;event_set framed_off 1 isdnback true’Define the action 'isdnback'at second CentauriDirect command: ‘action_create isdnback event_set framed_off 1 normal true;com_waitmsecs 4000;com_disconnect 1;com_waitsecs 1000; com_interface isdn’Define the action ‘normal’at second CentauriDirect command:‘action_create normal com_disconnect 0;com_waitmsecs 3000;com_interface x.21;enc_slaveremote;enc_bitrate 256000;com_connect 1’Event programming at first CentauriDirect command: ‘event_set framed_off 1 isdnback true’Event programming at second CentauriDirect command: ‘event_set framed_off 1 normal true’Save the events at first and second CentauriDirect command: 'event_save'

Appendix


10.3. Establish./Hang. Up Connections By External Switches




• Centauri remote control with version 1.1.0.24 or laterNote:You can download the current Centauri system software and the latest remote software from thedownload section of the Mayah homepage at www.mayah.com.




10.3.3. Description of Starting/Ending Connections using External SwitchesClosing of input A should execute phonebook entry 1. Opening of input A should hangup connection.

10.3.4. How to input all the necessary Commands to the CentauriYou can type in all the necessary commands with help of the Centauri remote control software. Justskip to remote item <Expert/Direct Command>. You may be asked for a Superuser Password. This Superuser Password is determined by the firstuse of Centauri remote on your PC. If the Superuser gets lost you can recover it very easily. It is saved in the registry at: HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\SuperUserPassword.

How to use the direct command dialog:Just type in the Centauri command in the command edit field and confirm by pressing the ‘OK’ button.You’ll get the answer in the answer memo box.


Establish./Hang. Up Connections By External Switches


10.3.5. Necessary Commands

Define action ‘phone001’Direct command:'action_create phone001 phone_execentry 1'

Note: Execute phonebook entry 1

Define action ‘hangup’ Direct command:'action_create hangup com_disconnect 0'

Note: Disconnect all lines

Event ProgrammingDirect commands:'event_set centronic_a_on 1 phone001 true''event_set centronic_a_off 1 hangup true'

Save EventsDirect command:'event_save’

Appendix


10.4. Event Action Programming




• Centauri remote control with version 1.1.0.24 or later

Note:You can download the current Centauri system software and the latest remote software from thedownload section of the Mayah homepage at www.mayah.com.

10.4.2. Short Introduction to Centauri Event Action ProgrammingPlease consider that this is not a detailed description of how Centauri event action programming isworking. It just wants to give you a little impression of its possibilities. Generally Centauri event actionprogramming just has the intention to combine events like


with actions. An action can be defined as a set of Centauri commands and will be executed, if anevent happened.For detailed description see Communication Reference Manual, Centauri Gateway, chapter 4.18,Event Action Programming. How to input all the necessary Commands to the CentauriYou can type in all the necessary commands with help of the Centauri remote control software. Justskip to remote item <Expert/Direct Command>. Maybe you get asked for a Superuser Password . This Superuser Password is determined by the firstuse of Centauri remote on your PC. If the super user gets lost you can recover it very easily. It is saved in the registry in: HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\SuperUserPassword.

10.4.3. How to use the direct command dialog:Just type in the Centauri command in the command edit field and confirm by pressing the ‘OK’ button.You’ll get the answer in the answer memo box.


Event Action Programming

96

10.4.4. Example : Event Action ProgrammingIn this case the event is an interrupted connection for which a specific action file has been created.This action file includes various commands to, amongst other things, automatically establish a newconnection via another communication interface. The following example describes how a new connection via ISDN is built up after the existing IPconnection has been interrupted.

Creating Action FilesBefore assigning the action to the event, two action files are to be created. For this the followingcommand is to be used:action_create <action file name> <command1;...;commandn>

Creating action file backup:action_create backup event_set connect_off 1 normal true;

com_interface isdn; com_waitmsecs 500,

com_connect 1 0811551661Creating action file normal:action_create normal event_set connect_off 1 backup true;

com_interface net

The commands specified for these two action files are described in the following chapter.

Assigning Action to EventThe first command combines the event connect_off (as described in chapter 2) with the actionbackup.

The action file backup includes different commands (see above):1. The first line assigns the action file normal to the event connect_off if it occurs the next time.2. Within the next line, ISDN is selected for new communication interface .3. This command defines a break of half a second (500 ms).4. The last command selects the first B-channel for connection, sets the phone number (e.g.

0811551661, the Mayah test line ) and then executes the connection.

Neis 1. 2.

Aswa

event_set connect_off 1 backuptrue

event_set connect_off 1 normaltruecom_interface isdncom_waitmsecs 500com_connect 1 0811551661

© MAYAH Communication GmbH

xt the other action file normal is described. This one will be executed if another connect_off eventdetected.

The first line assigns back the action file backup to the event connect_off.Then the interface is reset to net for establishing an IP-connection if the next connect command isexecuted.

described in this example, Centauri Event Action Programming provides an easy and individualy of reacting to events and problems that occur.

event_set connect_off 1 backuptruecom_interface net

Appendix


10.5. Point to Multipoint for Centauri 300x, 350x




• Centauri remote control with version 1.1.0.31Note:You can download the current Centauri system software and the latest remote software from thedownload section of the Mayah homepage at www.mayah.com.

10.5.2. Point-to-MultipointThe Point-to-Multipoint-mode enables the Centauri 300xand 3500 to receive/send data from/to several differentremote Centauri-devices. When processing the datatransfer one can choose which input is to be heard (fordetailed description see Centauri CommunicationReference Manual, chapter 4.2.10 ). For handling Pointto Multipoint with the Centauri Remote Software, youhave to choose <Settings/Others/Multipoint returnchannel> .

10.5.3. Centauri Remote SoftwareYou can type in all the necessary commands with help ofthe Centauri remote control software. Just step to remoteitem <Expert/Direct Command>. You may be asked for a Superuser Password . ThisSuperuser Password is determined by the first use ofCentauri remote on your PC. If the Superuser gets lostyou can recover it very easily. It is saved in the registry at: HKEY_CURRENT_USER\Software\Mayah Communications\Centauri Remote\SuperUserPassword.How to use the direct command dialog:Just type in the Centauri command in the command edit field and confirm by pressing the ‘OK’ button.You’ll get the answer in the answer memo box.


Point to Multipoint for Centauri 300x, 350x


10.5.4. Settings with Direct CommandFor using the Point to Multipoint, special settings have to be established.Example:

1) Set format to automatic enc_format auto <Settings/Codec/Encoder Imux>

2) Choose the mode that is to be used:enc_mode mono <Settings/Codec/Encoder Mode>

3) Choose the bitrate. enc_bitrate 128000 <Settings/Codec/Encoder Bit Rate>

There are currently only two different bitrates available : For 1-channel-connection you have to choose 64.000 bit/sec.

For 2-channel-connection you have to choose 128.000 bit/sec.The remote devices must have the same settings as the multipoint-server. These settings can bemade locally on the multipoint server or on the remote devices. In this case the server acts as a slaveand synchronizes itself with the remote settings.

10.5.5. StartThe command com_receive [0,1] controls the activity of the multiplexer. The parameter [1]enables the Point-to-Multipoint-mode, whereas [0] disables it.Example:

com_receive 1 enables Point-to-Multipoint

com_receive 0 disables Point-to-Multipoint

10.5.6. AddressingIf the Point-to-Multipoint mode is enabled, the same command as above, but with a differentparameter, is responsible for addressing the B-channels that are to be used for data-transfer:com_receive[1..n], where n is the max multiplexer-index. This multiplexer-index can be derivedfrom following formula : n = max ISDN B-channels*64000 / EncoderbitrateThis means that for 1-channel connections n is the number of B-channels that are available, whereasfor 2-channel-connections n is the half of it .For 2-channel-connections the channels of the multipoint server can only be chosen in neughbouringpairs : (1,2), (3,4), (5,6), (7,8)Example:

com_receive 2 For the settings made above (bit rate 128000) this would mean B-channels 3and 4 are selected for hearing.

Generally the addressing of the B-channels only works in one direction. This means the multiplexercan only receive data with all its channels or send data with all its channels. The possibility to receiveon one channel while transmitting on another is planned, but not currently available.

10.5.7. Observation on FrontpanelDuring Point-to-Multipoint is enabled, the status of each connection can be observed on thefrontpanel. For changing from one connection to another, the keypad can be used. Which keypad-button is to be pressed, depends on the adjusted bitrate. If a bit rate of 64000 b/sec is chosen,pressing the buttons 1./ to 8tuv will show the status of the specific connection. With a bit rate of128000 b/sec, this means, two channels are used for each connection, the buttons 1./ to 4ghi willshow the specific status. The selected connection is displayed as M1, M2 etc.

Note: If a button is pressed, that doesn’t represent a connection, the framing-LED will be disabled.

Appendix


10.6. HTTP Streaming with Centauri StreamingServer

10.6.1. HTTP streaming The Centauri Webserver is able to generate up to 4 different coded audio streams (encoderalgorithms) at the same time. The generation of the streams can be executed from any webclient/player by running HTML command files stored in the WWW directory of the addressed Centauri.

10.6.2. HTTP Command FilesStructure of a HTML commandfile (see also example files):

Syntax:

Parameter:Param1: [SlotNr]Param2: [Algorithm]Param3 [Samplerate]Param4: [Bitrate]Param5: [Mode]

SlotNr defines the encoder slot that should run the requested algorithm. This value is validfrom 1 to 4. Please note that only different slots can be streamed at the same time. Algorithm , Samplerate, Bitrate, Mode are to be used as defined in theencoder section of the communication command reference manual. The additional value‘none’ for algorithm is to be set for using the actual encoder settings, e.g. . In this case values for samplerate, bitrateand mode have to be set, but are not relevant.Note: Streaming with different samplerates only works properly if the rates are multiples of therunning sample rates. Example: A mix of 32 and 48kHz doesn't work. A mix of 8, 16, and32kHz or a mix of 8, 16 and 48kHz works fine.

Note: The encoder audio type (see Communication Reference Manual, chapter 4.3.10) has tobe set individually for each chain used. Default value is analog.

10.6.3. Execution of HTTP Command FilesAny HTTP request will start an audio stream/encoder with the requested parameter, if no otheraudio stream/encoder is active on this slot at this time. After the last HTTP request has been doneby the web client/player, the audio stream/encoder will be stopped.

File extensions of HTML commandfiles are ignored by the StreamingServer. This option supportsdifferent web browsers and the use of any extensions to start special players for the selectedalgorithms which is important for HTML-programming.

Example: An HTTP request on STREAM1.mp2, STREAM1.wav or STREAM1.mp3 by a webbrowser is executed by the Webserver through the HTTP command file STREAM1.htm.

Example files:Stream1.htm :Stream2.htm :Stream3.htm :

HTTP Streaming with Centauri StreamingServer


Stream4.htm :

Note: If the used StreamingServer is connected to another Centauri, this is doneautomatically via Slot 1, so a simultaneous streaming on this slot will cause transmissionfailures. In this case use one of the other slots.

10.6.4. Issues to consider in case of double assignment of a slotWhen establishing a connection from a Centauri 300x to a StreamingServer, Chain 1 willautomatically be used. If this chain is also used for streaming, the following effects can appear: Atcertain intervals the audio will be pulled off and after a short break it is then streamed faster. Thiscauses a so-called Micky Mouse effect. To prevent this phenomenon the streaming should not berouted over the first slot in this case.

Appendix


10.7. J.52 Connections

10.7.1. Prerequisites• Centauri with system software 1.1.0.13 or later

Note:You can download the current Centauri system software and the latest remote software from thedownload section of the Mayah homepage at www.mayah.com.

10.7.2. GeneralJ.52 : Digital transmission of high-quality sound-programme signals using one, two or three 64 kbit/schannels per mono signal (and up to six per stereo signal)

H.221 : Protocol, used by J.52, to exchange information between different devices about supportedcoding-algorithms and how to share data streams between several ISDN channels. It is an ITU(International Telecommunication Union) standard for guaranteeing compatibility between differentmanufacturers.

Before H.221 the problem with high-quality digital sound transmission was the different setting of thetransmitting and the receiving interfaces concerning the Encoder/Decoder algorithm, sample rate andsupported maximum bit rate. When the receiving interface worked e. g. with G.722, it refused allincoming data which hadn’t been encoded with this particular algorithm. J.52 has been developed tosolve this problem by providing a way to synchronize the different interfaces.

10.7.3. Synchronizing with J.52While establishing a connection the interfaces exchange information about the algorithms, samplerates and maximum bit rates provided by each. Depending on this information they choose anencoder which is able to be decoded by the receiver.The Centauri executes this process depending on the following parameters, adjustable either via theCentauri Frontpanel Display (Setup / Audio Encoder) or the Centauri Remote Control Software:

Front Panel Display Remote Control Command ParametersType Enc_algo G.722, G.711, Layer 2, Layer 3,

MPEG2-AAC, MPEG4-AAC *Dependency Enc_slave Local, remote

*) for detailed description see Centauri Audio Gateway, Communication Reference Manual, chapter4.3.2, Encoder Algorithm

• Dependency, enc_slave = local The locally adjusted encoder will be chosen if it is supported by the receiver. If it is not, noencoder will be used. With MPEG algorithms, no bit rate higher than the adjusted one will beused.

• Dependency, enc_slave = remoteThe algorithms will be compared and the first that is suitable for both interfaces will be chosen.The order of searching depends on the algorithm.

Local algorithm Search orderG.722 G.722, MPEG2-AAC, MPEG4-AAC, Layer3, Layer2,G.711* Layer 2 Layer2, Layer3, MPEG2-AAC, MPEG4-AAC, G.722*, G.711* MPEG2-AAC MPEG2-AAC, MPEG4-AAC, Layer3, Layer2, G.722*, G.711*MPEG4-AAC MPEG4-AAC, MPEG2-AAC, Layer3, Layer2, G.722*, G.711*others Layer3, MPEG2-AAC, MPEG4-AAC, Layer2, G.722*, G.711**) The algorithms G.711 and G.722 are used if the hardware sample rate allows it (for example it isimpossible to use 44,1 kHz and 16 kHz, since a whole-numbered sample rate proportion betweenhardware and encoder/decoder is required).

The information which will be transmitted to the receiver depends on the settings of the decoder.• Dependency, dec_slave = local

Just the current algorithm and the adjusted sample rate will be transmitted.• Dependency, dec_slave = remote

All available algorithms and samplerates will be transmitted.


Dual Mode


10.8. Dual Mode


- min. Pentium 166 MHz- RAM 32 MB- Operating system Windows ’95, ’98, ME, NT or 2000- Free serial port (remote control by RS232) or Ethernet card (remote control by IP)


• Centauri remote control with version 1.1.0.31Note:You can download the current the Centauri system software and the latest remote software from thedownload section of the Mayah homepage at www.mayah.com.

10.8.2. Dual ModeUsing Dual Mode the Centauri 200x and 300x are able to split an S0 and use different codecs forsending/receiving audio to/from two different remote devices. Thus the number of B-channelsbelonging to an ISDN interface can be arranged in different ways depending on the requirements ofthe different audio signals. For example it is possible to assign the B-channels 1 and 2 to the firstcodec while B-channel 3 to 8 are assigned to the second codec. Running the Dual Mode the Centauridemands a sample rate of 8 to 32 kHz in steps of 8.Note: If different sample rates are used for the two codecs, these should be multiples, e.g. 16 and 32or 8 and 16 kHz. Otherwise the audio quality can be reduced.

10.8.3. Available AlgorithmsThe following algorithms are available for Dual Mode:G.711, G.722, Mpeg Layer 2, Mpeg Layer 3 (only 64000 B/s), AAC (only 64000 B/s), Standard apt-X,Enhanced apt-X (only fast CPUs)

10.8.4. Settings with the Centauri Remote SoftwareFor handling the Dual Mode with the Centauri RemoteSoftware, you have to choose <Settings/Others/DualMode at B-channel>. The select box which will bethen opened, will contain a number of values,depending on the type of ISDN card installed. If theCentauri has e. g. an 4xS0 ISDN interface, the selectbox will contain the values 0, 2-8. For executing theexample mentioned above, you have to select 3because the third B-channel is the first one used bythe second codec. For disabling the Dual Mode, youhave to select 0.

• Exception:A special problem occurred when one 1xS0 ISDNinterface was installed and the value 2 was chosen forDualmode at B-channel. While in this constellation,removing the second established connection beforethe first works without any problems, but removing thefirst established connection tends to cause an audiodrop out on the second one. Solving this problem is only possible if a second 1xS0 ISDN interface is installed. In this case thesecond channel of each 1xS0 ISDN interface is deactivated. So corresponding to the example above,we no longer have channels 1-4 but just channels 1 and 3. Channel 1 belongs to Subcodec 1 andChannel 3 belongs to Subcodec 2. Both subcodecs now have only one ISDN channel each and cancarry a bit rate of only 64 kBit/s. With these modifications the different connections now work properlywithout any failures.


Appendix


10.8.5. Centauri Remote Software Direct CommandYou can type in all the necessary commands with help of the Centauri remote control software. Juststep to remote item <Expert/Direct Command>. How to use the direct command dialog:Just type in the Centauri command in the command edit field and confirm by pressing the ‘OK’ button.You’ll get the answer in the answer memo box.

10.8.6. Settings with Direct CommandUsing the Centauri Remote Software Direct Command, the settings of the Dual Mode are to beconfigured with the command com_dualmode <B-channel> (see Centauri Audio GatewayCommunication Reference Manual, chapter 4.2.3). As described in chapter 3, the valid parametersdepend on the type of installed ISDN interface.

Example:

1) Enable Dual Mode and use B-channel 3 to 8 by the second codec com_dualmode 3

4) Disable Dual Modecom_dualmode 0

10.8.7. Settings with the Centauri Front PanelOf course it is also possible to adjust the Dual Mode settings via the front panel display of theCentauri. For this you have to choose <Setup/Misc/Dualmode>. Like the select box of the CentauriRemote Software, the display will provide values subject to the installed ISDN interface. These valuescan be adjusted by pushing the navigation buttons to count them up or down . If Dual Mode is activated the status of the two different subcodecs can be observed by pressing thekeypad-button 1./ for the first subcodec and 2abc for the second. The selected subcodec is displayedas S1 or S2.

Multicast


10.9. Multicast

10.9.1. IntroductionMultimedia transmission via the internet has become more and more popular in recent years. Theaudio and video signals are captured, compressed and transmitted to a group of receiving hosts. Thisgenerates several problems in organizing the whole procedure. Multicasting could be a way todistribute multimedia data to the receivers, while these may join or leave an audio-cast or a video-castat any time. The flexibility in joining or leaving a group provided by multicast could make the varyingmembership much easier to handle.

While Unicast stands for a communication pattern that sends data from one host to another andBroadcast represents the transmitting from one host to all others inside a network, the principle ofMulticast is to send data from one source host to a varying number of destination hosts, whereasthese hosts must have the possibility to request these particular data by transmitting a specificMulticast-address to the next router or „prune“ an existing Multicast connection.

The problems with Multicast arise when you think about how data will find the way from sender toreceiver. While normal radio or television reach their receivers by spreading data all over the worldlike a watering can, transmitting through the net has some significant restrictions, like bandwidth andworkload. The watering can principle would cause the net to collapse as much as transmitting a datastream via a point-to-point connection for each receiver. Another problem is getting the senders orrouters to know which hosts want to receive their data and which don’t.

The intention of Multicast is to need as little bandwidth as possible in order to keep the workload ofthe net as small as possible. This means not wasting any bandwidth by sending unnecessary data,but only sending to hosts that request data and sending it via the shortest and/or most efficient way. Ingeneral this means that the sender delivers the data only once and it is then duplicated by a router asclose to the receiver as possible.

10.9.2. The process of MulticastThe organizing of transmitting and receiving multimedia data is managed by a protocol called IGMP(Internet Group Management Protocol), by which clients can tell a router that they want to join or leavea multicast-group. This multicast-group is a quantity of sender/receiver, registered at their routers for aspecial Multicast-IP.

At IP level there is a specific range of Class D addresses reserved for Multicast. The four significantbits of the class-D addresses are set to 1 1 1 0. The 28-bit number following these four bits iscalled “multicast group ID“ which ranges from 224.0.0.0 to 239.255.255.255.Each specific Multicast data stream is defined by a Multicast group ID. If a host wants to join a certainMulticast group for transmitting or receiving specific data, it has to inform its immediate neighbourrouter by sending the specific Multicast ID via an IGMP-telegram. This ID will then be forwarded fromrouter to router for to see if there are other Multicast group members (see Figure 1: Request forMulticast).

Figure 1 : Request for Multicast

Sender

Receiver

Router

Router

Router

Router

Router

Router

Router

Router

Router

Router

Sender

Sender

Appendix


If the hosts neighbouring router now gets data from the requested Multicast group, it will forward it tothe demanding host (see Figure 2: Sending Multicast). Of course the same host is able to act as asender, too. In this case the neighbouring-router will transmit its data to all the other group members.

Figure 2 : Receiving Multicast

To leave a Multicast group the host has to „prune“ a Multicast ID, which means that it has to tell itsneighbouring router not to forward data of the specific group any more.

10.9.3. Centauri and MulticastMulticast is available for all Centauri 3000/3001 Audio Gateway, Centauri 3500 Audio Concentratorand Centauri 4001 StreamingServer which support IP-Audio.

To act as a Multicast sender the“Dependency“ parameter of the Audio Encoder has to be set tolocal. To receive Multicast data the dependency has to be remote, so that the Centauri is able tosynchronize its settings with the transmitting host. In both cases the broadcast mode has to bedisabled. This is to be controlled via frontpanel with Setup->Network->Broadcast or with directcommand ip_broadcast ?

FrontpanelFor preparing the encoder for transmitting or receiving Multicast data you have to choose Setup->Audio Encoder->Dependency

and set the required parameter. Then choose Connect and set the Multicast address viaDirect Dial, Last or Phonebook .

Direct CommandFor setting the parameter with the Centauri Direct Command you have to use the commandenc_slave [dependency] Enc_slave local : transmitting MulticastEnc_slave remote: receiving Multicast

Then use Com_connect [Multicast address]for connecting.

Sender

Receiver

Receiver

Receiver

Receiver

Router

Router

Router

Router

Router

Router

Router

Router

Router

Router

Multicast


Remote ControlUsing the Centauri Remote Control you have toclick Settings->Codec->Encoder followsand set the required parameter (see pict.). ThenclickExpert->Direct Command and enter the Multicast address. Or clickPhonebook and choose the Multicast address.

Appendix


10.10. Centauri ISDN CAPI Trace

10.10.1. General concepts of the application interface Common-ISDN-APICOMMON ISDN API (CAPI) is an application programming interface standard used to access ISDNequipment connected to basic rate interfaces (BRI) and primary rate interfaces (PRI). For applicationdevelopers this standard provides a well-defined mechanism for communications over ISDN lineswithout having to adjust to the particularities of specific hardware vendors’ implementations. In return,ISDN equipment vendors benefit from a wealth of applications ready to run with their equipment.

Having begun in 1989 with manufacturers defining an application interface that would be accepted inthe growing ISDN market, CAPI is now a well-established standard. Potential cost savings were thedriving force for COMMON ISDN API controller and application development. Commercial users arerapidly migrating to ISDN as the principal medium for exchanging data in a wide range of formats.

COMMON ISDN API Version 2.0 reflects more than ten years of ISDN business implementationexperience in an exploding market. It incorporates all the benefits of CAPI Version 1.1 as well as allactual aspects of ISDN (such as Group 3 fax connectivity or video-telephony). It is based on Q.931 /ETS 300 102, but not limited to these protocols. It simplifies the development of ISDN applicationsthrough many default values which do not need to be programmed. It keeps applications free of ISDNprotocol knowledge, thus making a great variety of applications possible.

COMMON ISDN API provides an abstraction of ISDN services that is independent of the underlyingnetwork and of the adapter used to connect to the network. It provides an easy-to-use interface forapplications and offers a unified access to different ISDN services such as data, voice, fax, video,telephony, etc.

10.10.2. OverviewCOMMON-ISDN-API provides a standardized interface which allows any number of applicationprograms to use any number of ISDN drivers and ISDN controllers. Applications can be freelyassigned to specific drivers and controllers:

• One application can use one controller

• One application can use more than one controller

• Several applications can share a single controller

• Several applications can share more than one controller

Applications can use different protocols at different protocol levels; COMMON ISDN API provides aselection mechanism to support this. COMMON ISDN API also performs an abstraction from differentprotocol variants, creating a standardized network access. All connection-related data such asconnection state, display messages etc. is available to applications at any time.

COMMON ISDN API covers the entire signaling protocol as well as protocol layers 1 to 3 (physicaland framing layer, data link layer and network layer) of the data channels. The interface of COMMONISDN API is located between Layer 3 and Layer 4, and provides a point of reference for applicationsand higher level protocols.

COMMON ISDN API offers many commonly used protocols to applications without low-level protocolknowledge. The default protocol is ISO 7776 (X.75 SLP), i.e. framing protocol HDLC, data linkprotocol ISO 7776 (X.75 SLP), and a transparent network layer. Other supported framing layervariants are HDLC inverted, PCM (bit-transparent with byte framing) 64/56 kbit, and V.110 sync /async. COMMON ISDN API integrates the following data link and network layer protocols: LAPD inaccordance with Q.921 for X.25 D-channel implementation, PPP (Point-to-Point Protocol), ISO 8208(X.25 DTE-DTE), X.25 DCE, T.90NL (with T.70NL compatibility) and T.30 (Group 3 fax).

Even if not all protocols can be completely fitted into the OSI scheme, COMMON ISDN API alwayssupports three layers. Applications can configure each layer. In case of illegal or meaningless protocolstack combinations (e.g. bit-transparent 56 kbit/s and X.25 DCE), COMMON ISDN API reports anerror.

Centauri ISDN CAPI Trace


10.10.3. Message OverviewThis chapter presents the basic mechanism used by COMMON ISDN API, based on message queuesfor the exchange of commands and data.

The term message is a fundamental one in the definition of COMMON ISDN API. Messages areinformation defined by COMMON-ISDN-API, exchanged between the application and COMMONISDN API by an asynchronous mechanism. This technique achieves operating system independence.

General Message ProtocolCommunication between the application and COMMON-ISDN-API always uses the following generalprotocol:

A message is always followed by an appropriate reply. Messages going from an application toCOMMON ISDN API are called Requests; the corresponding answer from COMMON ISDN API iscalled a Confirmation. Messages initiated by COMMON ISDN API are called Indications; thecorresponding answer from an application is called a Response. This is also reflected in the namingconvention for messages: every message name ends with the appropriate suffix (_REQ, _CONF,_IND and _RESP).

Each message contains a message number. COMMON ISDN API always returns the number used inthe REQUEST message in the corresponding CONFIRMATION. Applications may choose uniquemessage numbers to identify message correlation before interpreting incoming messages.INDICATIONS from COMMON ISDN API are numbered so that an application is guaranteed to get adifferent message number in every incoming INDICATION.

An application is not allowed to send RESPONSE messages without having received anINDICATION. COMMON ISDN API ignores such illegal messages.

10.10.4. Message StructureAll messages exchanged between applications and COMMON ISDN API consist of a fixed-lengthheader and a parameter area of variable length, with one parameter immediately following another.No padding occurs in the message header or parameter area.Figure 1: Message Layout

Message Header Parameter 1 Parameter 2 ... Parameter n

In order to facilitate future extensions, messages containing more parameters than defined shall betreated as valid messages. COMMON ISDN API implementations and applications shall ignore allsuch additional parameters.

The message header has the following layout:

Figure 2: Message Header Layout

Total Length Application ID Command Subcommand Message Nr

The message header is composed of the following functional elements:

Header element Type Contents

Total Length Word Total length of the message including the completemessage header.

Application ID Word Unique identification number of the application. Theapplication ID is assigned to the application by COMMON ISDN API in the CAPI_REGISTER operation

Command Byte Command

Subcommand Byte Command extension

Message number word Message number as described in 3.1 above

Appendix


Table of Messages

Messages are logically grouped into three kinds:

• Messages concerning the ISDN signaling protocol (D-channel)

• Messages concerning logical connections (B or D-channel)

• Administrative and other messages

The following table gives an overview of the defined messages and their functions.

Table 1: Messages concerning the signaling protocol

Message Value Description

CONNECT_REQ 0x02 / 0x80 initiates an outgoing physical connection

CONNECT_CONF 0x02 / 0x81 local confirmation of the request

CONNECT_IND 0x02 / 0x82 indicates an incoming physical connection

CONNECT_RESP 0x02 / 0x83 response to the indication

CONNECT_ACTIVE_IND 0x03 / 0x82 indicates the activation of a physical connection

CONNECT_ACTIVE_RESP 0x03 / 0x83 response to the indication

DISCONNECT_REQ 0x04 / 0x80 initiates clearing down of a physical connection

DISCONNECT_CONF 0x04 / 0x81 local confirmation of the request

DISCONNECT_IND 0x04 / 0x82 indicates the clearing of a physical connection

DISCONNECT_RESP 0x04 / 0x83 response to the indication

ALERT_REQ 0x01 / 0x80 initiates sending of ALERT, i.e. compatibility with call

ALERT_CONF 0x01 / 0x81 local confirmation of the request

INFO_REQ 0x08 / 0x80 initiates sending of signaling information

INFO_CONF 0x08 / 0x81 local confirmation of the request

INFO_IND 0x08 / 0x82 indicates specified signaling information

INFO_RESP 0x08 / 0x83 response to the indication

Centauri ISDN CAPI Trace


Table 2: Messages concerning logical connections


CONNECT_B3_REQ 0x82 / 0x80 initiates an outgoing logical connection

CONNECT_B3_CONF 0x82 / 0x81 local confirmation of the request

CONNECT_B3_IND 0x82 / 0x82 indicates an incoming logical connection

CONNECT_B3_RESP 0x82 / 0x83 response to the indication

CONNECT_B3_ACTIVE_IND 0x83 / 0x82 indicates the activation of a logical connection

CONNECT_B3_ACTIVE_RESP 0x83 / 0x83 response to the indication

CONNECT_B3_T90_ACTIVE_IND 0x88 / 0x82 indicates switching from T.70NL to T.90NL

CONNECT_B3_T90_ACTIVE_RESP 0x88 / 0x83 response to the indication

DISCONNECT_B3_REQ 0x84 / 0x80 initiates clearing down of a logical connection

DISCONNECT_B3_CONF 0x84 / 0x81 local confirmation of the request

DISCONNECT_B3_IND 0x84 / 0x82 indicates the clearing down of a logical connection

DISCONNECT_B3_RESP 0x84 / 0x83 response to the indication

DATA_B3_REQ 0x86 / 0x80 initiates sending of data over a logical connection

DATA_B3_CONF 0x86 / 0x81 local confirmation of the request

DATA_B3_IND 0x86 / 0x82 indicates incoming data over a logical connection

DATA_B3_RESP 0x86 / 0x83 response to the indication

RESET_B3_REQ 0x87 / 0x80 initiates the resetting of a logical connection

RESET_B3_CONF 0x87 / 0x81 local confirmation of the request

RESET_B3_IND 0x87 / 0x82 indicates the resetting of a logical connection

RESET_B3_RESP 0x87 / 0x83 response to the indication

Table 3: Administrative and other messages


LISTEN_REQ 0x05 / 0x80 activates call and info indications

LISTEN_CONF 0x05 / 0x81 local confirmation of the request

FACILITY_REQ 0x80 / 0x80 requests additional facilities (e.g. ext. equipment)

FACILITY_CONF 0x80 / 0x81 local confirmation of the request

FACILITY_IND 0x80 / 0x82 indicates additional facilities (e.g. ext. equipment)

FACILITY_RESP 0x80 / 0x83 response to the indication

SELECT_B_PROTOCOL_REQ 0x41 / 0x80 selects protocol stack used for a logical connection

SELECT_B_PROTOCOL_CONF 0x41 / 0x81 local confirmation of the request

MANUFACTURER_REQ 0xFF / 0x80 manufacturer-specific operation

MANUFACTURER_CONF 0xFF / 0x81 manufacturer-specific operation

MANUFACTURER_IND 0xFF / 0x82 manufacturer-specific operation

MANUFACTURER_RESP 0xFF / 0x83 manufacturer-specific operation

This has been a short general overview about COMMON-ISDN-API. If you want more detailedinformation about this theme click http://www.capi.org. The following chapters deal with the CentauriCAPI trace.

http://www.capi.org/

Appendix


10.10.5. Centauri and ISDN CAPI TraceThe Centauri uses the COMMON ISDN API for tracing the process of an ISDN connection. The CAPItrace of the Centauri provides a possibility to journalize all messages exchanged between CentauriSoftware and COMMON ISDN API. It will be enabled if the file isdncapi.run on the d: partition of theCentauri flash card is found at Centauri system start. The tracing is addressed to the filesd:\isdncapi.act and d:\isdncapi.prv which can be examined afterwards.

NOTE: This option is only for troubleshooting and analyzing. Normal Centauri codec function isrestricted in ISDN trace mode.

10.10.6. Executing ISDN CAPI Trace on CentauriCarry out the following steps to perform the Centauri ISDN CAPI trace:

1) Create an ASCII file called isdncapi.run on your PC

2) FTP copy the file isdncapi.run to the main directory of the d: partition of the Centauri flashcard (FTP user: Admin; FTP password: Power)

3) Reboot the Centauri so that the isdncapi.run can be recovered to enable the trace mode

4) Execute the Centauri ISDN connection(s) you wish to trace

5) FTP download the files isdncapi.act and/or isdncapi.prv from the d: partition of the Centauriflash card

6) FTP delete the file isdncapi.run from the d: partition of the Centauri flash card

7) Reboot the Centauri to disable the trace mode

8) Send the files isdncapi.act and/or isdncapi.prv to Mayah Communications for analysis

The New Centauri Keypad


10.11. The New Centauri Keypad

10.11.1. OverviewAs many of you noticed, the Centauri series has had a new front panel design since the beginning of2002. Besides some new software features that can be adjusted via the front panel, some changeshave been made to the key pad and some additional functions made available through thealphanumeric buttons.

The most significant reason for developing a new front keypad for the Centauri series was theapparent discrepancy between the menu structure of the Centauri front panel display and thenavigation via the keys of the keypad. While moving through the different menu items was mostlyvertical, the direction of the arrow keys provided were horizontal. We considered this a bit irritating anddeveloped the new design for a more intuitive way of handling the Centauri functions via the frontpanel.

10.11.2. View of the old and the new CentauriHere is a general comparison of the two different front views

The front key pad of the old Centauri

The front key pad of the new Centauri

10.11.3. What has changedAll in all there is not so much that has changed. The arrow-up button and the arrow-left button havebeen swapped as well as the arrow-right and the ENTER-button. This results in a synchronization ofarrow direction and navigation direction. If you now want to go down the menu on the front panel, youhave to press the arrow–down button and not the arrow-right button as before. Respectively, to go upthe menu you have to press the arrow-up instead of the arrow-left button.

Appendix


The ENTER-button has been changed to a button with a right-pointing arrow surrounded by atriangular line. The function remains the same. With this button you can choose a menu item orsave an entry.

The arrow-up button has changed to a button with a left-pointing arrow represented by atriangular line. With this button you can, as before, go one level higher in the menu structure ordelete an entered letter.

10.11.4. Additional FunctionsAdditional functions are available with the new release via two of the alphanumeric keys. On the “*+”-key there is added a dial-symbol which stands for a speed dial function. Instead of having to gothrough the whole menu structure to establish a connection, it is now possible to do this directly frommost parts of the menu. By pressing the -key you will see following items on the front panel:Last(...)Phonebook ConnectDisconnectWith default Phonebook is marked. After pressing the Right Arrow button (Enter), you can enter aspecific phonebook entry number. With the new release these numbers are displayed in parenthesisbehind the phonebook entries. You can then establish the connection with Connect. The same fastway of stopping a connection is now possible by pressing the -key, moving to the item Disconnectand press the Right Arrow button (Enter).On the “#@”-key, there is added an open-book symbol which represents the phonebook.Pressing this key from most parts of the menu, you will be led directly into the phonebook menu.The functions that were implemented on these keys before are swapped to the keys “1./” and “9wxyz”.With “1./” you’ll switch at the beginning of a list, while ”9wxyz” takes you to its end.

10.11.5. Table of ChangesOld Centauri Front Function New Centauri Front Function

Move upwards in menu Move upwards in menu

Move downwards inmenu

Move downwards inmenu

Choose item or saveentries

Choose item or saveentries

Go back to a highermenu level or discardentries

Go back to a highermenu level or discardentries

Switches to thebeginning of a list

Speed Dial function forproviding a fast way ofconnecting ordisconnecting

Switches to the end ofa list

Speed Dial function forproviding a fast way ofmaking the phonebookentries available

Switches to thebeginning of a listSwitches to the end ofa list

Centauri Streaming Server w. Different Media Players


10.12. Centauri Streaming Server w. Different Media Players

10.12.1. StreamingWith the Centauri Streaming Server MAYAH aims to provide a new audio web server concept thatminimizes administration costs while maximizing the number of listeners that can be reachedsimultaneously – simply connect the audio, set the IP address and stream ahead.The Centauri Streaming Server is able to generate up to 4 different-coded audio streams (encoderalgorithms) at the same time. The generation of the streams can be executed from any webclient/player by running HTML-command files stored in the WWW directory of the addressed Centauri.

These HTML-command files contain information about slot number, algorithm, sample rate, bit rateand mode of the audio stream. For detailed information see Application Note 6, Webserver HTTPStreaming.In this Application Note, Windows Media Player, Real Player and Winamp exemplify how to use theCentauri Streaming Server with different Media Players.

10.12.2. Windows Media Player

For receiving an audio stream from a Centauri4001 Streaming Server with the Windows MediaPlayer you just have to go to the File menu. Thenclick on the menu item Open and the Open-dialogwill be visible. Now you have the possibility to enter a URL withthe name or IP-address of the Centauri StreamingServer and the stream file you want to receive.Examples:http://www.10.0.0.255/stream1.mp3http://www.CentauriBsp/stream2.wav

This causes a search on the D-partition ofthe Centauri for the specified stream filewhich will then be streamed to therequesting Windows Media Player.

Appendix


10.12.3. Real Player

Using Real Player, the procedure toreceive a stream from a CentauriStreaming Server is almost the same.Click on the File menu item to openthe popup menu and then click onOpen Location.

A dialog opens in which it is possibleto enter a URL with the specificCentauri address and stream file.

10.12.4. Winamp

The design of the Winamp applicationdiffers from that of the other programs.So the steps needed to get aconnection to a Centauri StreamingServer differ a bit, too.To open the popup menu here, youhave to click on the right mouse buttonwhile the mouse pointer is locatedabove the Winamp-window. There willbe different popup menus dependingon the position of the mouse. You willget the desired popup menu if themouse pointer is positioned at the topor bottom area, or on the equalizerarea. If you now place the mouse above themenu item Play, another popup menuis activated. Choose Location and, justas with the other Media Players, adialog will open. Here you can enter theURL of the required stream asdescribed above, and you will beconnected to the Centauri 4001Streaming Server.

Centauri Streaming Server w. Different Media Players


10.12.5. Audio Quality MP3 currently defines the most commonalgorithm for audio coding, so WindowsMedia Player and Real Player can onlydecode mp3-streams. On the other hand,Winamp has the additional ability todecode mp3Pro, which features only halfthe bit rate of mp3 at the same audioquality. For this it is necessary to installso-called plug-ins.Click the right mouse button, when it ispositioned on the same areas asdescribed above, place the mouse on themenu item Options and click onPreferences when the next popup menuis opened.Now you’ll get a window which shows alist containing the available input plug-inswhich can be configured by selecting andpressing the Configure button. Toconfigure mp3Pro, select THOMSONmp3PRO Decoder.

Appendix

Centauri user manual revision level 02/2003

10.13. Centauri StreamingServer with Multicast

10.13.1. MulticastMulticast defines a way of delivering streams via the internet that lies between Unicast and Broadcast.While Unicast stands for a communication pattern that sends data from one host to another andBroadcast represents the sending from one host to all others inside a network, the principle ofMulticast is to send data from one source host to a varying number of destination hosts, whereasthese hosts must have the possibility to request these particular data by transmitting a specificMulticast address to the next router or „prune“ an existing Multicast connection (for detailedinformation see Application Note 9, Multicast).The intention of Multicast is to need as little bandwidth as possible for to keep the workload of the netas small as possible. This means not wasting any bandwidth by transmitting unnecessary data, butjust send to hosts which request data and to send it via the shortest and/or most efficient way. Ingeneral this means that the sender delivers the data just once and it is duplicated by a router as nearto the receiver as possible.Multicast is available for all Centauri 3000/3001 Audio Gateway, Centauri 3500 Audio Concentratorand Centauri 4001 Streaming Servers that support IP-Audio.

10.13.2. Multicast with the Centauri StreamingServer

The Centauri Streaming Server is able to galgorithms) at the same time. The generclient/player by running HTML-command file(see Application Note 12, Streaming servespecial Multicast-address which defines a sp

10.13.3. Multicast with HTTP-Strea

Generating HTTP-command file

A HTTP-command-file can be created with a

hould run the requested algorithm. This value is validnt slots can be streamed at the same time.

te, Mode are to be used as defined in the encoder reference manual.

rates only works properly if the rates are multiples of the: A mix of 32 and 48kHz doesn't work. A mix of 8, 16, ands fine.

ed on the D:-partition of the Centauri with the extension

Centauri StreamingServer with Multicast


Executing HTTP-command filesThe execution of the command file can be activated by any web client or media player which is part ofthe net. The structure has to be as followed:http://[Centauri-address or name]/[command file-name. extension]whereas the extension is irrelevantExample:http://10.0.0.255/stream.mp3http://CentauriExa/stream.wavhttp//Centauri-address or name/ activates a search in the www-folder of the addressedCentauri. Only the name of the command file is significant for searching. The extension just defines inwhich way the data should be interpreted. This option makes it possible to execute different formatsfrom any web browser which is important for HTML programming.

10.13.4. Multicast with Multicast-addressingAnother way of using Multicast with the Centauri, not yet implemented for four aggregates but for one,is to join or leave a Multicast-group by transmitting a Multicast-address. These addresses must belongto a number of special IP addresses reserved for this purpose. The range of Multicast addresses isfrom 224.0.0.0 to 239.255.255.255. So addressing the four Centauri aggregates could look likethe following example:

224.0.0.10 Aggregate 1224.0.0.20 Aggregate 2224.0.0.30 Aggregate 3224.0.0.40 Aggregate 4Depending on whether the Centauri should act as a transmitter or a receiver for Multicast, it isnecessary to make some special settings. To act as a Multicast sender the “Dependency“ parameterof the audio encoder has to be set to local. To receive Multicast data the dependency of theencoder has to be remote, so that the Centauri is able to synchronize its settings with the transmittinghost. Note that the Centauri broadcast mode has to be deactivated for correct service. This is to becontrolled via front panel with

Setup->Network->Broadcast or with direct command ip_broadcast ?There are three different ways to make these settings and establish a connection.

FrontpanelFor preparing the encoder/decoder for transmitting or receiving Multicast data you have to choose Setup->Audio Encoder->Dependency and set the required parameter. Then choose Connect and set the Multicast address viaDirect Dial, Last or Phonebook .

Direct CommandFor setting the parameter with the Centauri Direct Command you have to use the commandenc_slave [dependency] Enc_slave local : transmitting MulticastEnc_slave remote : receiving Multicast

Then use Com_connect [Multicast address]for connecting.

Appendix


Remote ControlUsing the Centauri Remote Control you have to click Settings->Codec->Encoder followsand set the required parameter (see pict.). Then clickExpert->Direct Command and enter the Multicast address. Or clickPhonebook and choose the Multicast address.

10.13.5. Multicast with IP-addressingAlso planned for implementation is a third way to use Centauri for Multicast. In this case, instead ofusing specific Multicast-addresses, normal IP-addresses are used for a Centauri to join a Multicastgroup. For this the parameter Interface has to be set to Network. As in chapter 4, the broadcastmode has to be deactivated again.

Front panelFor setting the Interface to Network, chooseSetup->Network->Communication Interface->NetThen choose Connect and set the IP address/stream file.[htm;mp3;...] viaDirect Dial, Last or Phonebook .The addressed Centauri StreamingServer will then send the required stream.

Direct CommandFor setting the parameter with the Centauri Direct Command you have to use the commandcom_interface netThen use com_connect [IP address/stream file.[htm;mp3;...]]for connecting.

Remote ControlUsing the Centauri Remote Control you have to click Connectand choose IP (see pict.). Then insert the IP address and thestreamfile you want to execute.

Using stereo and joint stereo with the CDQPrima


10.14. Using stereo and joint stereo with the CDQPrima

10.14.1. DefinitionsUsing MPEG Layer 2 with stereo or joint stereo for an audio transmission between Centauri andCDQPrima generates some unexpected problems. For analyzing the reasons for these problems, wehave to accent the differences between the two modes.

StereoIn stereo mode the right and left channel of the signal are completely and separately encoded anddecoded.

Joint StereoUsing the joint stereo mode, the signal only is completely encoded and decoded within the lowerfrequencies (up to ca. 3,5 kHz). Above that value, only the level differences are encoded (decoded)entirely, the phase information is not, i. e. the panning is not transmitted.

Stereo versus Joint StereoUsing either stereo or joint stereo with MPEG Layer 2 has an important effect on the signalsbandwidth. For example, with a bit rate of 128 kBit/s and a sample rate of 48 kHz a difference ofapproximate 5 kHz occurs. While stereo with its completely encoded information for both channels hasa bandwidth of about 10 kHz, joint stereo has a bandwidth of 15 kHz by neglecting the phaseinformation of the higher frequencies.Choosing between the two modes thus depends on the preferences. For e. g. classical music it maybe more important to have all panning information to transmit the sound of the orchestra as close toreality as possible. On the other hand there might be transmissions which pay more attention to thebandwidth and neglect the loss of phase information in higher frequencies.

10.14.2. Compatibility problemsThe problems with the above frequency-dependent encoding and decoding arise when a Centauri andits Automatic Codec Detection (Flashcast) have to get compatible with a CDQPrima. The CDQPrima has the peculiarity of dynamically changing its mode depending on the frequency ofthe incoming or outgoing signal. This means, that, if in the beginning of an audio transmission thesetting for mode is joint stereo and the signal surmounts the critical value for frequency, the modeswitches automatically to stereo and back again if the frequency is reduced once more. This results inthe signal LED of the CDQPrima blinking continuously because the mode is always changing.Of course this generates a failure within the Centauri because the Automatic Codec Detection(Flashcast) can’t work properly.

10.14.3. Solving the problems with the CentauriAvailable with version 2.0.0.0For solving these compatibility problems with the CDQPrima, it was decided to generate someexceptions for the Automatic Codec Detection (Flashcast) of the Centauri. Now if the Centauri detectsone of the following Codecs on the far end:

• CDQPrima• CDQ 2000/2001• Telos Zephyr• Prodys Pronto

and additionally these settings:

• Algorithm: MPEG Layer 2• Detected Mode: Stereo

the Automatic Codec Detection is disabled and the mode that will be used depends on the mode ofthe Centauri’s encoder. If this value is

• Joint Stereo the used mode is joint stereo• Stereo the used mode is stereo

Appendix


10.15. Ancillary Data over MPEG Layer 3 with Centauri

10.15.1. GeneralIn some special cases explained below in this application note it is possible that the ancillary dataframing gets lost between the transmitting and the receiving device. This incorrect transmissionresults in overwritten or discarded data blocks.

10.15.2. DetailsWith MPEG Layer 3 it is possible to send a maximum of 7 bytes per frame of ancillary data (seeCommunication Reference Manual, chap. 5.5, Ancillary Data). According to standard, with a samplerate of 48 kHz one frame needs the time period of 24 ms to be transported. In this case one byteconsists of 1 start-bit, 8 data-bits as well as 1 stop-bit, so 1 byte corresponds to 10 baud. If we nowuse the formula for getting the baud rate needed, we get:7 * 10 / 0,024 = 2900 bps approximately

An adjusted baud rate of 2400 bps on the device can lead to the following situation:• There is more ancillary data sent with the MPEG-data than can be transported via the serial port

which generates a data overflow. If, in contrast, a higher baudrate, e. g. 4800 bps is set, the following problem can occur.• The Centauri takes more data than the MPEG-data is able to carry.

So there are two ways to provide an accurate transmission of ancillary data with MPEG Layer 3.• The baudrate of both devices must have a lower value than the MPEG data stream.• The device can have a higher baud rate as the MPEG data. In this case a handshake protocol is

required for organizing the data flow.

10.15.3. HandshakeThe task of a handshake protocol is to check whether the line is completely busy or not. If it is, thefurther transport of data will be delayed for a specific time interval so that no data will get lost.According to Communication Reference Manual, chap. 4.12.5, Ancillary Data Interface Handshake,there are 3 different handshake-protocols available with the Centauri. The following list shows theseprotocols with their particular difficulties in use.• XonXoff

Status information is included within the data. The same symbols can occur, when a file is sent.This can lead to failures.

• DSRDTR Wire not availableThe HyperTerminal program (part of the MS-operating system) doesn’t support this protocol.

• RTSCTSBuffer capacity fullFor this protocol the following zero modem cable is required.

Pin No. at Centauri(DB 9 male)

Pin description Pin No. at PC(DB 9 male)

Pin description

1; 6 Data Carrier Detector (DCD)Data Set Ready (DSR)

4 Data Terminal Ready (DTR)

2 Received Data (RD) 3 Transmitted Data (TD) 3 Transmitted Data (TD) 2 Received Data (RD)4 Data Terminal Ready (DTR) 1;

6Data Carrier Detector (DCD)Data Set Ready (DSR)

5 Ground (GND) 5 Ground (GND)7 Request to Send (RTS) 8 Clear To Send (CTS)8 Clear to Send (RTS) 7 Request to Send (RTS)9 not used 9 not used

Note: The zero modem cable shipped with the Centauri cannot be used for this since the CTSpins are bridged to the RTS pins.

• NoneIf no handshake protocol is used, the baud rate has to be less than 2900 baud, otherwise the datatransmission can be interrupted.

Event Action Programming with TTL


10.16. Event Action Programming with TTL

10.16.1. GeneralThe Event Action Programming is described in detail in chapter 4.18 of the Communication ReferenceManual. This Application Note includes a short example for using the Event Action Programming withTTL inputs.

10.16.2. Example

Creating action filesThe command action_create generates an action file. The action file name is handed over as firstparameter. The following parameter are the remote commands that are listed in the file (separated by";"). The file name consists of at least 8 letters or numbers. As an alternative it is possible to transmit aASCII-file (called *.CAF) by FTP with the commands included to the directory "actions".

action_create Dial phone_execentry <nr>action_create Hangup com_disconnect 0

Two actions (“Dial” and “Hangup”) are created with these commands. “Dial” includes the connection toa phonebook entry with a specific number. “Hangup” leads to a disconnect.

Assigning actions to eventsThis command sets one of up to 5 combinations of conditions and action files for each event. If anevent occurs, then all 5 conditions are evaluated. If a condition is true, the associated action file will beexecuted. The standard condition is false to avoid executing an action file. This setting will not besaved! A special remote command saves all settings. Note: An open TTL-input Port has a high level (signal_on).

One TTL-Port

event_set centronic_a_off 1 Dial trueevent_set centronic_a_on 1 Hangup true

This example needs just one TTL-Input. If it is closed (off), the action “Dial” will be executed. If it isopen (on) again, the action “Hangup” will be executed.

Two TTL-Ports

event_set centronic_a_off 1 Dial trueevent_set centronic_b_off 1 Hangup true

This example needs two TTL-Inputs. If centronic_a is closed (off), the action “Dial” will be executed. Ifcentronic_b is closed (off), the action “Hangup” will be executed.

Two TTL-Ports with conditions

event_set centronic_a_off 1 Dial centronic_bevent_set centronic_b_off 1 Hangup centronic_a

This example needs two TTL-Inputs and describes additional conditions. If centronic_a is closed (off)while centronic_b is open, the action “Dial” will be executed. If centronic_b is closed (off) whilecentronic_a is open , the action “Hangup” will be executed.

Appendix


10.16.3. Centauri Centronic Port / TTL I/O

Pin No. Pin description 2 Alarm3 Framed4 Connected5 Output A6 Output B7 Output C8 Output D9 Output E10 Input D11 Input E12 Input C13 Input B15 Input A18-25 Ground

Connecting two Centauries with X.21


10.17. Connecting two Centauries with X.21

10.17.1. Connecting Centauri with other devicesThe problem with high-quality digital sound transmission is the different setting of the transmitting andthe receiving interface concerning Encoder/Decoder algorithm, sample rate and supported maximumbit rate. If the receiving interface is working e. g. with G.722, it refuses all incoming data not encodedwith this particular algorithm. With the encoder/decoder-parameter Dependency, MayahCommunication has been developing a way to solve this problem by providing a possibility tosynchronize the different codec algorithms automatically.This parameter can be configured as local or remote. Local means that the encoder respectivelydecoder uses its own settings. If, for example, the Centauri’s encoder is set to local and the far-enddevice’s decoder-settings are configured in another way, accurate data transmission is impossible.This can be avoided by setting the dependency parameter to remote. In this case, for example, theCentauri’s encoder examines which values are chosen for the far-end device’s decoder, and thenchanges its own settings to an identical configuration.

10.17.2. Connecting two CentaurisThis works fine with nearly all devices from other manufacturers except for a few special situationsdescribed in chapter 5.1.1 of the Centauri User Manual. But what if the far-end device is also aCentauri whose value for dependency is remote? In this situation each Centauri is waiting for the other to send its settings for to establish its ownidentical configuration. Though there will be a connection established (yellow LED) the framing (blueLED) doesn’t work, so nothing would happen but waiting.

10.17.3. Requirement for connecting two CentaurisTwo different configurations are possible for solving the problem mentioned above.

Symmetrical connectionTo use Centauris solely within a X.21 net, at least one of the encoder-dependency-value has to belocal. This device doesn’t wait for the specifications of the other Centauri but immediately starts tosend data in its own configured format. The Centauri on the far end with the dependency remote nowgets the required information and configures its own settings identically.

Asymmetrical connectionIf the far-end Centauri is also configured local, an asymmetrical connection is possible.Example: Centauri-A is connected to Centauri-B

Settings Centauri-A: Encoder: MPEGL2, 128kBit, "Local" Decoder: unimportant, "Remote"

Settings Centauri-B: Encoder: MPEGL3, 128kBit, "Local" Decoder: unimportant, "Remote"

Then, after connection, following configuration is established:Centauri-A: Encoder: MPEGL2, 128kBit

Decoder: MPEGL3, 128kBit Centauri-B: Encoder: MPEGL3, 128kBit

Decoder: MPEGL2, 128kBit

Front panel displayNote: In the status display of the Centauri front panel normally the currently working encoder/decodervalues are indicated. If there is no framing, such as during the problematic situation described above,the values configured in the setup section are indicated.

Appendix


10.18. IP-connections with two Centauris

10.18.1. TCPConnections via TCP are basically possible with an identical format on both sides.If MPEG algorithms (e.g. Layer2, Layer3, AAC) are chosen, different settings on local and far-endencoder/decoder are possible.

If non-MPEG algorithms are chosen, algorithms and settings have to be identical.

10.18.2. Particularities on reconnects with IP/UDP

A special situation has to be examined within this chapter. Given is an active IP or UDP connectionbetween two Centauris which is disconnected for reasons that will not be discussed here. If theconnection is now reestablished within the period defined by the ‘timeout’ parameter and in the sameformat as before, there will be a delay time period of up to 100 ms. If the reconnection is made afterthe timeout period or with changed settings, no problem will occur.

10.18.3. Particularities on not recognizable algorithms with UDPIf the encoder’s dependency mode of the receiving Centauri is set to local, the sending Centauri hasto set its decoder to local, too. In this case it is guaranteed, that via UDP the connection works in bothways.

EncoderCentauri

DecoderCentauri

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