Commissioning Instruction MDRS155EC

Ericsson InternalCOMMISSIONING INSTRUCTION 1 (34)

Prepared (also subject responsible if other) No.

EDD/IGS/R Dirk Hildebrandt EDD-07:003195 UenApproved Checked Date Rev Reference

EDD/IGS/R [Dirk Hildebrandt] 2009-09-14 E

Approvers/checkers: Att:

Commissioning Instruction Marconi LH

Contents1 Commissioning Preparation.................................................................. 3

1.1 General......................................................................................... 31.2 System setup before commissioning............................................. 3

2 Antenna Alignment ................................................................................ 52.1 General information about antenna characteristics ....................... 52.2 Alignment Procedure .................................................................... 52.2.1 Preparation............................................................................... 52.2.2 Measurement of receiving level during antenna alignment ....... 62.2.3 Principle of Alignment Procedure ............................................. 72.2.4 Transforming the Alignment Value............................................ 82.3 Known Faults ................................................................................ 9

3 Measuring the polarization discrimination ......................................... 103.1 General....................................................................................... 103.2 Operation with horizontal polarization ......................................... 103.3 Operation with vertical polarization ............................................. 103.4 Operation of a radio link with orthomode transducer (OMT) ........ 11

4 Polarization discrimination optimization............................................ 124.1 General....................................................................................... 124.2 Preparation ................................................................................. 124.3 Principle of Procedure................................................................. 124.4 Optimization................................................................................ 134.4.1 Mechanical optimization ......................................................... 134.4.2 Electrical optimization............................................................. 13

5 Space diversity delay compensation .................................................. 145.1 General....................................................................................... 145.2 Procedure ................................................................................... 14

6 Waveguide and antenna measurements............................................. 156.1 Reflection measurement at the waveguide.................................. 156.1.1 Setup and calibration for test gear.......................................... 156.1.2 Reflection Measurement Description ...................................... 176.2 Distance-To-Fault measurement at the waveguide ..................... 186.2.1 Setup and calibration for test gear.......................................... 186.2.2 Distance-To-Fault Measurement Description.......................... 21





6.3 Test setup for RTL and DTF Measurements ............................... 24

7 Fade Margin Test.................................................................................. 247.1 Introduction................................................................................. 247.2 Power measurement with Power Meter....................................... 247.2.1 Power Meter Calibration ......................................................... 247.2.2 Receive Level Measurement .................................................. 257.2.3 Transmit Power Measurement................................................ 267.3 Fade Margin Test Procedure....................................................... 27

8 Initial System Measurements and Setups .......................................... 288.1 Measurement finalization ............................................................ 288.2 Commissioning finalization.......................................................... 29

9 Firmware Download and Activation .................................................... 309.1 General....................................................................................... 309.2 Preparation ................................................................................. 309.3 Download of the system software packet .................................... 309.4 Activating of the system software packet .................................... 31

10 Bit Error Rate Test (BERT)................................................................... 3210.1 General....................................................................................... 3210.2 Procedure ................................................................................... 32

11 Commissioning Protocol Marconi LH................................................. 3311.1 General....................................................................................... 3311.2 Using the electronic protocol (if recommended) .......................... 33





1 Commissioning Preparation

1.1 General

Before starting, the commissioning of Marconi LH systems following preconditions must be fulfilled:

Site ready for commissioning

all equipment complete and correct installed

delivered equipment according delivery note

1.2 System setup before commissioning

Procedure:

Power on the system

Connect Service-PC with LMT-SW (Ver. 7.0 542 or higher) to the radio (TMN-Module)

Open ‘Signal structure’ go to / SDH-NE / Equipment / Network element: MDRS155-EC

Network element Nom./act. Equipment: Check the visible actual configuration according to the delivery note. Set the Actual to the Nominal by pressing the ‘Act.->Nom.’ Button

Open ‘Signal structure’ go to / SDH-NE / Control/EDI, NE Control

NE Control Software: Check the running software: Description: DRS-EC 2.5.3 BUILD 15; Activated: Yes; Running: all nodesIn case an older version of software is active, you must upgrade the system software

Open ‘Signal structure’ go to / SDH-NE / Equipment / Network element: MDRS155-EC

Make all necessary settings for network management system (e.g. SOA) following the customer site documentation:Free ASCII text, Equipment side: e.g.: MRJ 6741 A to RRJ 7503 AOperating mode: QD2-IP / QD2-SISAV-IP; SISA node no.: 1 to 247Internet address: SOA: xxx.xxx.xxx.xxxTSAP Ids: NE access no (SOA): 1 to 254TCP/IP Connection: IP-address: xxx.xxx.xxx.xxx

Subnet mask: xxx.xxx.xxx.xxxDefault-Gateway: xxx.xxx.xxx.xxx

Go to / SDH-NE / Equipment / Network element: MDRS155-EC / Functional view

Check Service channels – Line1: Line config.:E1/F1 disabled, DCC inactive

Check Service channels – Radio1: Radio config.:E1/F1 disabled; WSC/DSC disabled; DCCR active

Check OP1 to OPn and PR1

Transmitter, OPn/PR1 :





Transmitter config. RF settings: TX Power : 30,0 dBm (depend on frequency range and customer requirements)Transmitter config. ATPC : Off; Holdover time: 5 min; TX power after expiry of holdover time : nom. value –20 dBTransmitter Config. Radio hop ID outgoing: 0

Receiver, OPn/PR1 :

Receiver Config. ATPC : Automatic (ATPC); nom. RX level: -50,0; holdover time: 5 min.; TX power after …: nom. value –20 dBReceiver Config. Radio hop ID expected: 0

Commissioning, OPn/PR1

Commissioning Transmitter: Transmit Signal: On; Restart time: 30 min.; Mode: Normal operationCommissioning Space diversity: Space diversity: On; Start delay time compensation after alignment of main and diversity antenna; Combiner mode: Normal operationCommissioning CCDP mode: CCDP mode: On (only for the OP/PR whose Ch. status is on Master, check for Slave will be done automatically.)Check if the right Cross-polar partner channel is shown.

Synthesizer, OPn/PR1 :

Synthesizer Config.-General: RF band: e.g. 11,0 GHz; Freq. pattern: e.g. ITU-R F.387; check if TX ch. pos. is upper or lower band; check if the right channel no.(11 / 12) according to this OP/PR is set.

Protection, OPn/PR1 :

Protection Config. -Operating mode: Protection mode: Line Protection, (n+1)Protection Config. -Line protection n+1 OP: Operating mode: OP inhibited; Channel priority: lowProtection Config. -Line protection n+1 PR: Occ. traffic: loose

Go to / SDH-NE / Equipment / Network element: MDRS155-EC / Hardware view

Sisa0 N 1, Module

Sisa0N Module System Redundancy: System Redundancy: Line protection n+m with occasional traffic

STM1-EC OP 1/OP 2, Module:

STM 1 Module Config. – SOH processing: Service channels – Radio: Enable DCCR

Check used channels, if they are connected to the required polarity of the antenna





2 Antenna Alignment

2.1 General information about antenna characteristics

The following picture is an example for a three dimensional antenna characteristic of a parabolic antenna.

Fig. 2-1

2.2 Alignment Procedure

2.2.1 Preparation

1. Make sure all digital microwave radio equipment is installed on both sites, the far-and near-end and the frequencies and output powers are set.

2. Make sure all required tools, units and accessories are available.

3. Arrange for communication between the sites, to coordinate alignment actions.

4. Align both antennas roughly, but as accurately as possible. Set the elevation angle at zero Deg.

5. Turn the transmitter on.

Note: If the radio is equipped with Automatic Transmitter Power Control (ATPC) make sure the function is turned off during alignment.





2.2.2 Measurement of receiving level during antenna alignment

The sub contents below will described the different possibilities how to measure the receive level during the antenna alignment.

2.2.2.1 AGC-Method (automatic gain control voltage)

1. Connect the voltmeter to the assigned alignment port of the digital microwave radio equipment on the connection interface of the radio unit.

2. The voltmeter is used to measure and find the maximum receive power value during the alignment procedure.


2.2.2.2 Spectrumanalyser-Method

1. Connect the spectrumanalyser to the receive port of the branching unit or directly to the antenna system. Set the spectrumanalyser at the right frequency range.

2. The spectrumanalyser is used to measure and find the maximum receive power value during the alignment procedure.


3. Set the digital microwave radio equipment at both end in the CW-mode (clean wave / without modulation)





2.2.3 Principle of Alignment Procedure

Fig. 2-2

2.2.3.1 General

Some working areas involve the risk of accidents caused by falling or by falling objects.Make sure that both antennas already roughly aligned at the main lobe. You will have a receive level near the expected value, but not less then 10dB below the expectation. If you cannot find that value one of the antennas is not pointed at the main lobe.

The antenna alignment must perform at fading free conditions.

Depending on the microwave radio equipment configuration and the chosen measurement method the receive level measurement can be take place near the antenna or next to the radio equipment (equipment room). Both receive level measurement methods (AGC-Method and Spectrumanalyser-Method) are same accurate.

During the whole alignment procedure the receive level must continuously be monitored.

1.2.





2.2.3.2 Azimuth Alignment

First the horizontal alignment (azimuth) has to be done. Therefore the antenna should be turned with the jackscrew horizontally from the centre of the main lobe in one direction. If the measured receive value is decreasing the antennas must be turned in the other direction. The antenna must be turned in the same direction until the receive level reach a value about 6 to 3 dB below the expected value (see picture above reference point 1). Stop to turn the antenna and record the measured receive value. Start turning the antenna with the jackscrew by counting the flats (60 Deg at jackscrew) until reaching the same receive level value at the other side of the main lobe (see picture above reference point 2). Stop turning the antenna. Turn the antenna with the jackscrews half of counted flats backwards. The maximum of the receive level will be reached at this point. Make sure that in anytime is no play in the jackscrew and the antenna bearings.Tighten the locking screws for horizontal alignment when the maximum value is found and mark the position at the mast.

2.2.3.3 Elevation Alignment

Second the vertical alignment (elevation) has to be done. Therefore the antenna should be turned with the jackscrew in the vertical plane from the centre of the main lobe in one direction. If the measured receive value is decreasing the antennas must be turned in the other direction. The antenna must be turned in the same direction until the receive level reach a value about 6 to 3 dB below the expected value. Stop to turn the antenna and record the measured receive value. Start turning the antenna with the jackscrew by counting the flats (60 Deg at jackscrew) until reaching the same receive level value at the other side of the main lobe. Stop turning the antenna. Turn the antenna with the jackscrews half of counted flats backwards. The maximum of the receive level will be reached at this point. Make sure that in anytime is no play in the jackscrew and antenna bearings.Tighten the locking screws for vertical alignment when the maximum value is found and mark the position at the mast.

Make sure all screws are tightened when the alignment procedure is finished.

Measure the alignment level and record the value.

2.2.4 Transforming the Alignment Value

Transform the alignment value into RF input level. (use an equipment alignment curve or a monitoring read out)

Compare the RF input level with the one specified in the installation data form (calculated for the system during path calculation) and check that the calculated level is obtained.

Note: The antenna alignment must be performed at the main and diversity antenna.





2.3 Known Faults

Depending on how proper the roughly alignment was done, especially vertical too high or too low, it happens that between the both side lobes appears a more or less strong signal of the main lobe within the alignment pattern. -> Therefore the antenna should be turned for roughly alignment in the middle of the both side lobes. (see picture below)

Sometimes happens that the alignment is done at one of the side lobes. When this happens the roughly alignment was not proper done. -> Repeat the rough alignment of the antenna.

After alignment the receive level does not reach its maximum anymore.During tightening, the antenna has moved on the mast. -> Repeat the alignment and be aware of the play in antenna bearing jackscrew and holder.

Antenna alignment in azimuth and elevation proper done

Antenna is misaligned in azimuth or elevation

Fig. 2-3 different antenna align pattern





3 Measuring the polarization discrimination

3.1 General

If a radio link is operated in both the vertical and horizontal polarization planes (e.g. OMT1 required at the antenna), measure the receive levels to determine the polarization discrimination. The measurements need to be done for main and diversity antennas in fading free condition.

Note Only necessary in conjunction with two polarized antenna! In order to measure a polarization discrimination of at least 30 dB for shell-antenna, HSX-antenna or antenna identical in construction and at least 24 dB (only with operation mode “ATPC on”) for HPX-antenna or antenna identical in construction, the receive level must be > - 45 dBm.

3.2 Operation with horizontal polarization

Make sure that

- all transmitters of the radio link are active,

- the ATPC function is off,

- and the maximum TX power assigned is not exceeded.

1. In the local station (near end), measure the receive level in normal operation.

2. Note down the value measured at the horizontal polarization plane.

3. If both transmitters are tuned to the same frequency (CCDP2), switch off all transmitters, except the transmitter, which operated in the vertical polarization plane in the far end. If the two transmitters are tuned to different frequencies (ACDP3, ACAP4), change the waveguide at the OMT of the antenna (near end) from the horizontal to the vertical position. (All transmitter off except the corresponding transmitter in the vertical polarization plane in the far end.)

4. Measure again the receive level in the near end at the horizontal polarization plane.

5. The difference between the values measured under item 1 and item 4 corresponds to the horizontal polarization discrimination.

3.3 Operation with vertical polarization

For measuring the polarization discrimination of a radio link operated in the vertical polarization plane, proceed as described in section 3.2.

1 orthomode transducer2 Co-Channel-Dual-Polarized3 Adjacent-Channel Dual-Polarized4 Adjacent-Channel Alternate-Polarized





3.4 Operation of a radio link with orthomode transducer (OMT)

In case the radio link operated with an OMT5 in ACCP6-mode or in 1+0 configuration, measure the polarization decoupling.

Fig. 3-1 Checking and identifying the polarization

1. In the local station (near end), measure the receive level in normal operation.

2. Note down the value measured.

3. Change the waveguide at the OMT of the antenna (near end) from horizontal to vertical position.

4. Measure again the receive level at the near end.

5. The difference between the values measured under item 1 and 4 corresponds to the horizontal polarization discrimination.

6. Restore the initial system status.

Test setup:

Far End Radio Hop Near End

One transmitter in Reading out RX levels:operation; all other RX level – operating polarization planetransmitters switched RX level of XPIC partneroff.

Laptop with control software (e.g. LMT) Laptop with control software (e.g. LMT)

Fig. 3-2 Measuring the polarization discrimination (e.g. Marconi LH)

5 orthomode transducer6 Adjacent-Channel Co-Polarized





4 Polarization discrimination optimization

4.1 General

In case the polarization discrimination did not reach the required value, the polarization discrimination needs to be optimized. The antenna alignment needs to be done excellent before starting the polarization discrimination optimization.For systems using CCDP7-mode with XPIC8-function the polarization discrimination must for shell-antenna, HSX-antenna or antenna identical in construction at least 30 dB – only with operation mode “ATPC on” for HPX-antenna or antenna identical in construction at least 24 dB – and not exceed 45 dB (e.g. Marconi LH). For systems using CCDP-mode without XPIC-function the polarization discrimination should be optimized to the maximum value.

4.2 Preparation

Some working areas involve the risk of accidents caused by falling or by falling objects.Depending on the nominal receive level different measurement methods are possible. Section 7.2.2 describes the receive level measurement. As well it is possible to usethe internal receive level measurement function of the radio equipment.

4.3 Principle of Procedure

high precision spirit-level

xv

yv yhxh

horizontal: bluevertical: orangehorizontal discrimination xh – yhvertical discrimination yv – xv

Fig. 4-1

7 Co-Channel-Dual-Polarized8 Cross-Polarization Interference Canceller





4.4 Optimization

4.4.1 Mechanical optimization

1. Untight the feedhorn at the antennas both ends near and far.

2. Turn the feedhorns monitoring by a high precision spirit-level until the feeds are levelled. While turning the feedhorn the spirit-level must always be monitored.

3. Fix the feedhorn when you reach the correct level.

4. With normal path propagation a polarization discrimination of at least 24/30 dB should already reached.

4.4.2 Electrical optimization

Make sure that

- all transmitters of the radio link are active,

- the ATPC function is off,

- and the maximum TX power assigned is not exceeded.

5. Untighten the feedhorn at the antenna at the local station (near end).

6. Measure the receive level in normal operation.


8. Measure the receive level at the cross-polarized port (see section 2).


10. Turn the feedhorn to reach the minimum receive level at the cross-polarized port. While turning the feedhorn the receive level must always be monitored.

11. Fix the feedhorn when you have reach the minimum receive level at the cross-polarized port.

12. Repeat the polarization discrimination measurement as described in section 2.

13. The polarization discrimination is now optimized and should be in the range as described above.

14. Restore the initial system status.





5 Space diversity delay compensation

5.1 General

Space diversity operation needs group delay compensation between the main receiving and diversity-receiving path. Primarily the group delay causes by different waveguide length for main and diversity path. Different compensation methods are possible. From technical point of view the easiest group delay compensation could be performed by using at least same waveguide length for main and diversity path. Depending at the system setup the group delay compensation has to be performed in the IF-path (IF-combiner) or in the demodulator (main and diversity path have separate demodulator/modulator). The Marconi LH combines the received radio signal in the IF-path. The group delay compensation is performed fully electronically.

5.2 Procedure

After logging in the Marconi LH system by using the LMT, the delay time compensation need to be done for each radio channel (OPn/PR1). Open in “Signal Structure” the configuration topic “Commissioning Space diversity”. Select menu delay time compensation and press the ‘Start compensation’-button.

Fig. 5-1 Space diversity operation





6 Waveguide and antenna measurements

6.1 Reflection measurement at the waveguide

6.1.1 Setup and calibration for test gear

The reflection measurement is carried out using the following measuring units and accessories:

Reflection measuring unit, e.g. "Site Master“ S820D (up to 18GHz) from Anritsu

Laptop with operating software from manufacturer of test gear

Measuring adapter with accessories depending on the RF frequency from

manufacturer of test gear (set of accessories)

Alternatively, this measurement can also be performed using comparable measuring units from other manufacturers.

Test setup for reflection measurements:

Measuring adapter

1/8 Offset

3/8 Offset

Absorber/Load

Fig. 6-1 Test setup for reflection measurement (calibration)





Preparing the reflection measurement:

1. Connect the "Site Master" using the appropriate RF cable and measuring adapter.

Note: Both the measuring adapter and RF cable are frequency-dependent!

2. Switch on the "Site Master".

3. Set the "Measuring Mode" to "Return Loss".

4. Enter the frequency range, F1 lower measuring frequency and F2 upper measuring frequency. These values are included in the Commissioning Manual or Customer Acceptance Manual.

The test setup can now be calibrated as follows:

1. Press the "Start Cal" button.

2. Select the Waveguide Flange menu by means of the cursor keys. Then confirm your selection by pressing the "Enter" key.

3. Select the correct flange type by means of the cursor keys and confirm again your selection by pressing the "Enter" key.

4. Select the "Start Calibration" menu item by means of the cursor keys. Then start the calibration process by pressing the "Enter" key.

5. Please follow the instructions displayed in the lower part of the screen.

Now connect the 1/8 Offset, 3/8 Offset and Absorber/Load to the measuring adapter one after the other. Ensure that the calibration adapter is securely attached to the measuring adapter by using the screws included in the delivery scope.

Note: Before connecting the measuring adapter to the antenna system, call up the Sweep Mode: "Single Sweep" via the "Option" menu item.





6.1.2 Reflection Measurement Description

Carry out the reflection measurement as follows:

1. Connect the measuring adapter of the calibrated test setup to the equipment side of the waveguide to be measured (with the antenna connected as "termination" to the other end).

2. Now perform a "Single Sweep" at the reflection-measuring unit over the calibrated frequency range (e.g. 7.1 to 7.75 GHz).

Requirement: The reflection measured must be ≥ 20 dB over the entire frequency range!

The graphical measuring result can be saved with the adjusted measuring parameters of the "Site Master“.

Via the keyboard, the measuring result can be assigned to a directory on the hard disk, a time and date stamp as well as a "Trace Designator". Then the measuring result can be copied to a computer/laptop by using of the "Site Master Software Tool“.

If required, the amplitude scale can be adapted as required. In addition, it is also possible to enter the Limit Line (20 dB) as well as a station name.

The measuring characteristic is exported as WMF file (Windows Meta File). The corresponding procedure is described in the operating instructions of the measuring unit that is used. The measuring characteristic exported in the form of a WMF file can be inserted in the corresponding sheet of the Commissioning Protocol.

In case of diversity operation, this measurement must be repeated for the second antenna system.

To save the measuring result, please press the "Save Display" button.

If the required reflection value is not reached, the measurement must first be performed for the waveguide only (without antenna system). For this purpose, the waveguide must be terminated with an absorber instead of the antenna (reflection value of the absorber: ≥ 40 dB).

Requirement: The reflection measured over the entire frequency range must be ≥ 23 dB for the waveguide!

When this value is reached, please check the remaining antenna system (without waveguide), so that the reflection loss measured for the whole system over the entire frequency range is ≥ 20 dB.





6.2 Distance-To-Fault measurement at the waveguide

6.2.1 Setup and calibration for test gear

6.2.1.1 General

The Distance-To-Fault measurement is carried out using the following measuring units and accessories:

Distance-To-Fault measuring unit, e.g. "Site Master“ S820D (up to 18GHz)

from Anritsu

Laptop with operating software from manufacturer of test gear

Measuring adapter with accessories depending on the RF frequency from

manufacturer of test gear (set of accessories)

Alternatively, this measurement can also be performed using comparable measuring units from other manufacturers.

6.2.1.2 Test setup for Distance-To-Fault measurements:

Measuring adapter

1/8 Offset

3/8 Offset

Absorber/Load

Fig. 6-3 Test setup for Distance-To-Fault measurement (calibration)





6.2.1.3 Front Panel Overview Site Master S820D

Fig. 6-4 Site Master Front Panel overview

6.2.1.4 Preparing the Distance-To-Fault measurement

1. Connect the "Site Master" using the appropriate RF cable and measuring adapter.

Note: Both the measuring adapter and RF cable are frequency-dependent!

2. Switch on the "Site Master".

3. Set the "Measuring Mode" to "Return Loss".

4. Enter the frequency range, F1 lower measuring frequency and F2 upper measuring frequency. These values are included in the Commissioning Manual or Customer Acceptance Manual.

5. Set the display resolution at the highest resolution rate. Function Hard Key Soft Key Resolution e.g. Soft Key 517 Keypad Hard Key





6.2.1.5 The test setup can now be calibrated as follows

1. Press the button.

2. Select the Waveguide Flange menu by means of the cursor keys. Then confirm your selection by pressing the key.

3. Select the correct flange type by means of the cursor keys and confirm again your selection by pressing the key.

4. Select the "Start Calibration" menu item by means of the cursor keys. Then start the calibration process by pressing the key.

5. Please follow the instructions displayed in the lower part of the screen.

Now connect the 1/8 Offset, 3/8 Offset and Absorber/Load to the measuring adapter one after the other. Ensure that the calibration adapter is securely attached to the measuring adapter by using the screws included in the delivery scope.

6.2.1.6 Select the Distance-To-Fault measurement

1. Set the "Measuring Mode" to "DTF-SWR" "Return Loss". DTF_SWR Return Loss

2. Enter the distance range, D1 distance measuring start point (0.0 m) and D2 distance measuring end point (waveguide-length). The measuring end point should be chosen up to the following full 10th meter of the waveguide-length, but at least 3 meter after the waveguide end.

3. Select the appreciated Waveguide Type. Soft Key Menu More Waveguide

4. Set the Windowing Mode at Rectangular. Soft Key Menu Window Rectangular

Note: Before connecting the measuring adapter to the antenna system, call up the Sweep Mode: "Single Sweep" via the "Option" menu item.





6.2.2 Distance-To-Fault Measurement Description

6.2.2.1 Carry out the Distance-To-Fault measurement as follows

1. Connect the measuring adapter of the calibrated test setup to the equipment side of the waveguide to be measured (with the antenna connected as "termination" to the other end).

2. Now perform a "Single Sweep" at the Distance-To-Fault-measuring unit over the calibrated frequency range (e.g. 7.1 to 7.75 GHz).

The graphical measuring result can be saved with the adjusted measuring parameters of the "Site Master".

Via the keyboard, the measuring result can be assigned to a directory on the hard disk, a time and date stamp as well as a "Trace Designator". Then the measuring result can be copied to a computer/laptop by using of the "Site Master Software Tool".

If required, the amplitude scale can be adapted as required. In addition, it is also possible to enter the Markers as well as a station name.

The measuring characteristic is exported as WMF file (Windows Meta File). The corresponding procedure is described in the operating instructions of the measuring unit that is used. The measuring characteristic exported in the form of a WMF file can be inserted in the corresponding sheet of the Commissioning Protocol.

In case of diversity operation, this measurement must be repeated for the second antenna system.

To save the measuring result, please press the button.





6.2.2.2 Requirement

The following pattern shows the value limits for the DTF result

Fig. 6-5 Distance-To-Fault measurements limit lines

Length

Frequency range0 l 10 m 10 m l (lmax – 3 m) (lmax – 3 m) l lmax

3 to 5 GHz 20 – 42 dB 32 – 42 dB 18 – 42 dB

6 to 8 GHz 20 – 42 dB 32 – 42 dB 18 – 42 dB

11 to 13 GHz 20 – 42 dB 32 – 42 dB 14 – 42 dB

Table 6-1 Distance-To-Fault measurements limits

The length of the waveguide between the interface at the equipment rack and the antenna interface is defined as lmax.





Description of the limits

0 < l ≤ 10 m In the first 10 m, the DTF value shall be better than 20 dB with no more than 3 peaks exceeding 42 dB.

10 m < l ≤ (lmax – 3 m)

From the first 10 m to 3 m before the antenna interface, the DTF value shall be better than 32 dB with no more than 4 peaks exceeding 42 dB.

In final 3 m at the antenna, the limit for the DTF value depends on the frequency band:

3 – 5 GHz RLmax > 18 dB



(lmax – 3 m) < l ≤ lmax

No more than 3 peaks exceeding 42dB are allowed.

Table 6-2 Description of the limits

There is no requirement for measured values better than 45 dB.

If the required Distance-To-Fault values are not reached, the waveguide and antenna system needs to be observed.





6.3 Test setup for RTL and DTF Measurements

Fig. 6-6 RTL and DTF measurements at the waveguides

7 Fade Margin Test

7.1 Introduction

The comparison between the calculated and in dependence on the receiver's input power measured fade margin delivers a statement about the design of a microwave radio link.

The fade margin has to be measured for every channel on every radio site of the microwave link as well as for every or intended polarization used at the time of acceptance.

7.2 Power measurement with Power Meter

7.2.1 Power Meter Calibration

The power meter needs to be calibrated and set to zero before each usage and before each change of the power sensors. The detail procedure for the power meter setup is described in the user guide of the power meter. Beware that Lin-factor and Cal-factor are frequency dependent and are needed to re-adjust for every usage.





7.2.2 Receive Level Measurement

1. Make sure that the ATPC at the transmitter/s on site A and B are switched off.

2. Site B: Remove the Semi-Rigid-Line from the channel branching network (CBN) which is connected with the receiver (RX or RXD below the cooling radiator).

3. Site B: Connect a suitable power meter (see test equipment list in the system description) to the output of the channel branching network (CBN). Make sure using the right measuring range at the power meter.

Power Meter

Power Sensor (low power)

Fig. 7-1: Principal receive power measurement with power meter

Note down the value for the receive level measured with the power meter in the electronic protocol at sheet „Site Measurement (2)“.

Check the measurement result according to the conception:The measured receive level is in the range of +3dB/-2 dB of the calculated receive

level.

4. Site B Remove the power meter and reconnect the Semi-Rigid-Line between receiver inputs and channel branching network (CBN).





7.2.3 Transmit Power Measurement

5. Site A: Remove the Semi-Rigid-Line between the channel branching network (CBN) and transmitter output (TX ).

6. Site A: Connect a suitable power meter (see test equipment list in the system description) to the transmitter output. Make sure using the right measuring range of the power meter. May use an additional attenuator (e.g. 20dB) in order to prevent damage to the power sensor.

Power Meter

TRX output optional attenuation (10dB or 20dB)

Power Sensor (high power)

Fig. 7-2: Principal of transmit power measurement with power meter

Note down the value for the transmit power measured with the power meter in the electronic protocol at sheet „Site Measurement (2)“.

Check the measurement result according to the conception:The measured transmit power is in the range of +1dB/-1 dB of the nominal transmit

power.





7.3 Fade Margin Test Procedure

7. Site A Remove the power meter and insert a variable attenuator (0-30dB) including cabling and connector between the transmitter output and it’s channel filter. Setup the variable attenuator at 0dB attenuation.

8. Site A Connect a SDH-Tester at the channel under test. Instead of a SDH-Tester it is also possible to use a PCM analyzer (2Mbit/s signal) connected through a multiplexer or WSC using the channel under test.

9. Site B: Connect a SDH-Tester at the channel under test or set a hardware/software loop instead. Use the same channel as at site A. As well it is possible to use a PCM analyzer (2Mbit/s signal) connected through a multiplexer or WSC using the channel under test.

radio hop variable attenuator for fade margin test

Site B Site A

PCM-Tester

2 MB-distributor

HW/SW-loop SDH-Tester

Fig. 7-3: Fade Margin Test

10. Site A: Increase the value of the attenuation at the variable attenuator until the PCM analyzer display at Site B a bit error rate (BER) of 10-6. If a HW/SW-loop is performed at site B, the PCM analyzer at Site A displays the bit error rate (BER).

Note: For measurement the fade margin it is essential, not to change the adjusted value at the variable attenuator when disconnecting from channel branching network (CBN).





11. Site A: In order to measure the actual transmit power, disconnect the measuring cable from the channel branching network (CBN).

12. Site A: Connect a suitable power meter as described in section “Transmit Power Measurement” to the now open end of the fade margin test set. Make sure using the right measuring range at the power meter. The difference between the nominal transmit output power and the measured transmit power after increasing the variable attenuator displays the fade margin. (TFM = PTXnom. – Pvar.).

Note down the value for the transmit power measured with the power meter in the electronic protocol at sheet „Site Measurement (2)“.

Check the measurement result according to the conception!

13. Site A: Remove the fade margin test set and reconnect the Semi-Rigid-Line between transmitter output and the channel filter.

14. If the measurements from site A in direction site B (TFM at site B) are carried out, the tests need to carry out from site B in direction site A.

15. Switch the ATPC on, after the fade margin test is performed at all channels at both sides of the microwave link!

8 Initial System Measurements and Setups

8.1 Measurement finalization

At this stage at both sites, far end and near end all measurements should be performed.

The next step is to interchange the necessary results between near and far end, which are:

1. transmit power of the corresponding receiver during receive level measurement from far end site

2. waveguide length at the far end site

3. antenna size(s) at the far end site

Note down the above-mentioned results.





8.2 Commissioning finalization

After finishing the measurements, the initial system setup needs to be configured.

Following steps needs to be done:

1. enable the ATPC at all channels (OPn and PR1)

2. Transmitter config. ATPC : On

3. Change the operating mode for all OPn to automatic

4. Protection Config.

Line protection n+1

OP: Operating mode: Automatic (if applicable)

5. Alignment of operating channels with the protecting channel

LMT – signal structure:

/ SDH-NE / Equipment / Network element: MDRS155-EC / Functional view/OPn / Commissioning, OPn

Commissioning Alignment:

1. Click the button: Start alignment with PR

2. Click the button: Start test with PR

3. Click the button: End alignment/test

4. Perform this alignment at all OP’s

6. Protection switching tests and setup

Before starting the protection-switching test, the alignment of each OP with the PR needs to be done.

Check the protection switching from OPn PR Pn, by switching of TX IF and by manual switchover with service PC (LMT) while checking the LED and the bit error tester. The bit error tester must run after every switchover error free.

7. Database upload

The system database needs to be read out after finishing all software settings and all necessary measurements. To start the database readout use the PullDown menu NE/Database/Upload. Store the database file locally by naming as following example: e.g. RRJ7503 to MRJ6741.mib

The data file ending is *.mib.

As well the database will be stored automatically into the SD-Card Memory on the TMN Module. This action will make the system finally ready for Plug&Play functionality.

Finally save a copy of an Offline session of the network elements. Use the PullDown menu File/Save as… . Store the Offline session file locally by naming as following example: e.g. RRJ7503 to MRJ6741.rse

The Offline session file ending is *.rse.





9 Firmware Download and Activation

9.1 General

The Marconi LH system supports firmware download features. The Marconi LH will be delivered usually with the latest firmware (SW) release. Up- and Downgrades are possible. Two independent firmware releases can be stored within the system. The firmware will be downloaded without activation. The firmware activation must be done in a further configuration step. Depending on customer requirements, the firmware may need to be changed. As well later firmware upgrades are possible. The firmware upgrade should be performed by authorize personal only. A change of the firmware may be traffic affecting.

9.2 Preparation

The firmware download file needs to be installed at the service PC. Therefore follow the firmware download installation descriptions. The system download control file needs a system download description file in the same directory: system_download_rel_25x_n.ctl -> system_descript_rel_25x_n.xml

9.3 Download of the system software packet

Procedure:

login to the Marconi LH system by using the LMT

be sure having write excess for the network element

open the '+ Equipment' path in the signal structure

the menu 'Network element MDRS155-EC' appears

with a left mouse click the line will be highlighted

with a right mouse click in the highlighted line a sub menu appears

choose the 'Network element File transfer'

press the "Load job list" button (File open symbol) for choosing the location of the System Download Control file

with a left mouse click on the 'Start' button the transmission of all system download files onto the plugged storage card (SD card) of the TMN board starts

if the message 'Control file completely processed' appears the download is completed

now the software packet is ready for activating

the system download needs approximately one a half hour





9.4 Activating of the system software packet

Any firmware update needs at least system software activation.

Procedure:

log in the Marconi LH system by using the LMT

be sure having write excess for the network element

open the '+ Control' path in the signal structure

the menu 'EDI, NEControl' appears

with a left mouse click the line will be highlighted

with a right mouse click in the highlighted line a sub menu appears

choose the 'NE Control Software'

If there are one respectively two packets on the storage card, each of them will be displayed in a description line

The command line below (- Select command -) offers two possibilities, to activate or delete (deactivate) SW packet 1 or 2. You have to chose 'SW x: activate'

With the 'Send' button the command is transmitted to the network element. The control question window has to be closed with ‘OK'

At the beginning of the activating phase the red LED of the TMN board flashes a few time

The activating process interrupts the connection between the service PC and the network element.

restart the connection via LMT main window menu: Session Online

check the running software packet by opening the configuration window: - Control - EDI, NEControl NEControl Software

Example for presentation of the software packet after successfully activation of packet 2:

SW Description Activated Running ---- ------------------ ----------- -------------- 1 DRS-EC 2.5.x BUILD m No 2 DRS-EC 2.5.x BUILD n Yes all nodes





10 Bit Error Rate Test (BERT)

10.1 General

A Bit Error Rate Test (BERT) delivers a statement about the design and performance of a microwave radio link. The BERT can be setup multiply looped via the operating channels and embedding several microwave hops. In cases of alarms and/or bit errors exceeds during the measurement period the BERT need to be performed for each channel and each link separately. The equipment internal performance counter supports to find the fault location. During a minimum registration period of 24 hours, the result of the BERT should reach the requirements as calculated in the link design report.

10.2 Procedure

The final commissioning step is a Bit Error Test performed over all new microwave radio channels. Different measurement methods are possible.

1. BERT each channel separately with two bit error tester (PDH/SDH)

2. BERT each channel separately with one bit error tester (PHD/SDH) and a far end loop (HW/SW)

3. BERT all channels multiply looped

For a daisy-chain constellation of microwave links all channels and all links can be multiply looped to perform the BERT in one term.

radio hop

Site B Site A

PCM-Tester

2 MB-distributor

HW/SW-loop(s) SDH-Tester

Fig. 11-1: Bit Error Test





11 Commissioning Protocol Marconi LH

11.1 General

An electronic protocol exists for documentation of the measurement results. Start the protocol and save the protocol as „[StationNo (near end)]_[StationNo (far end)].xls”e.g. MRJ6741A_RRJ7503A.xls

11.2 Using the electronic protocol (if recommended)

The following sections describe how to fill out the electronic protocol. The main pages are described below.

1. [Input]-page

- fill out the required data according to the path survey and the link calculation- measure with the LMT-SW the required value- fill out the measurement boxes (yellow boxes)- check the function of the dehydrator

(leakage of the feeder system; alarm output [LED; LMT-SW; XQI])

2. [Front page]-page

- fill out

3. [Hop calculation Main]-page

- fill out the missing points- if fading during measurement is recognizable, fill out the fading-condition-box,

otherwise type 0dB (beware! the tolerance will change)

4. [Hop calculation Div]-page

- if required, see above

5. [Site configuration]-page

- fill out the frequencies, band positions, polarization, hop ID- fill out the User-Data

6. [Site Measurement]-page

- fill out the measurement values, read out with LMT-SW- fill in the measured fade margin and the measured XPD





7. [WG-Reflection Main]-page

- fill out the maximal measured value- automatic read in from digital analyzer- or enclose an additional page with the protocol- or only value

8. [WG-Reflection Div]-page

- if necessary, same procedure as [WG-Reflection Main]-page

9. [Waveguide-Measurement]-page

Check whether all the yellow boxes filled out. Save the protocol. For printing, click the printout button.

Commissioning Instruction MDRS155EC

Documents

Transcript of Commissioning Instruction MDRS155EC