TG 21261.10 (C33208_20 B0) Operating Instructions

7/30/2019 TG 21261.10 (C33208_20 B0) Operating Instructions

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C33208001SE_A0 E Copyright Nokia Networks Oy

TG 21261.10

Ring Generator

Operating Instructions

C33208.20 B0


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TG 21261.10 Operating Instructions

C33208001SE_A0E Copyright Nokia Networks Oyii

E COPYRIGHT Nokia Networks Oy 1999All rights reserved.

No part of this publication may be copied, distributed, transmitted, transcribed, stored in a retrieval system, or translated into

any human or computer language without the prior written permission of Nokia NetworksOy.

The manufacturer has made every effort to ensure that the instructions contained in the documents are adequate and freeof errors and omissions. The manufacturer will, if necessary, explain issues which may not be covered by the documents.The manufacturers liability for any errors in the documents is limited to the correction of errors and the aforementionedadvisory services.

The documents have been prepared to be used by professional and properly trained personnel, and the customer assumesfull responsibility when using them.The manufacturer welcomes customer comments as part of the process of continualdevelopment and improvement of the documentation in the best way possible from the users viewpoint. Please submit yourcomments to the nearest Nokia sales representative.

NOKIA is a registered trademark of Nokia Corporation.

Any other trademarks mentioned in the documents are the property of their respective owners.


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Document History

Document Date Comment

C33208001SE_00 20 Apr 1993

C33208001SE_A0 7 Oct 1999 Infomation updated


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Contents

Chapter 1

Product description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Structure 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Operation 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.1 Power supply block 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.2 Reference circuit block 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.3 Control circuit block 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.4 Switching circuit block 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3.5 Signal tone generator block 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Technical Specifications 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 2Installation and operation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Introduction 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Connecting jumper settings 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.2.1 Setting Ring Generator to keyed or unkeyed mode 7. . . . . . . . . . . . . . .2.2.2 Setting frequency of the ringing voltage 7. . . . . . . . . . . . . . . . . . . . . . .2.2.3 Selecting ringing voltage 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.2.4 Bringing local and central batteries into use 8. . . . . . . . . . . . . . . . . . . .

2.3 Operation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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Product description

C33208001SE_A0 E Copyright Nokia Networks Oy 1

Chapter 1

Product description

1.1 Introduction

TG 21261 is a plug-in unit that generates the ringing voltage used for the ringingtone of the telephone set. It also generates the voltage required for the signal toneof the telephone set.

LED holder and unitextractor

Front plate

Figure 1 TG 21261.10 front plate


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1.2 Structure

The Ring Generator unit is a plug-in unit constructed on a EURO-2 size printedcircuit board and can be installed in any TM4 equipment cartridge or DYNANET

subrack. The unit is enclosed in a steel case. The front edge of the printed circuitboard provides a LED holder that also serves as the unit extractor. This LEDholder includes a green LED which is ON when the unit is operative, see Figure 1.

At the rear edge of the printed circuit board, there is a 232-pin Euroconnector.Through this connector, the unit receives its operating and control voltages fromthe backplane of the cartridge. In addition, the output voltages of the unit areconnected through this connector to the backplane of the cartridge.

The unit also incorporates the signal tone generator module.

1.3 OperationThe block diagram of the Ring Generator unit is shown in Figure 2. The unitconsists of the following blocks:

D power supply blockD reference circuit blockD control circuit blockD switching circuit blockD signal tone generator block.

A

E

B C D

425 Hz

1 V

16,67 Hz25 Hz50 Hz

75 V

90 V

A = Power supplyB = Reference circuitC = Control circuitD = Switching circuitE = Signal tone generator

REN = Ringing enabledCLK = Clock signal frequencyUref = Reference voltage

20.472 V

20.472 V

REN

CLK

Uref

DC

Figure 2 TG 21261.10 block diagram


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Product description


1.3.1 Power supply block

The integrated power supply generates the voltages required by the RingGenerator unit. In addition, the power supply extracts the output voltages of theunit from the battery voltage. You can select if the power supply uses the ringgenerator in the keyed or unkeyed mode. In the keyed mode, the power supply canbe turned ON or OFF remotely.

1.3.2 Reference circuit block

A sinusoidal reference voltage (Uref) is generated in the reference circuit. Thefrequency of this sinusoidal voltage is determined by the clock signal frequencythat is brought from the control circuit. You can select from three alternativereference frequencies: 16 2/3 Hz, 25 Hz or 50 Hz. The selected referencefrequency is brought into use by changing the frequency of the control circuitclock-oscillator. The reference voltage of the reference circuit is directed to thecontrol circuit (See Figure 2).

1.3.3 Control circuit block

The control circuit controls the operation of the Ring Generator unit. In the controlcircuit, the reference voltage is compared with the measuring voltage that isobtained from the switching circuit. The measuring voltage is a voltage directlyproportional to the output voltage of the unit. The control circuit controls the FETswitches of the switching circuit so that the difference between the reference andmeasuring voltages remains as small as possible. A current measuring voltage thatis directly proportional to the current of the FET switches is also directed to thecontrol circuit from the switching circuit. If the measuring voltage exceeds itslimits, the control circuit will protect the unit against the output short circuits bydisabling the control of the FET switches.

1.3.4 Switching circuit block

The FET switches are incorporated in the switching circuit block. The controlcircuit turns the FET switches ON and OFF via the control transformers whichgenerate a sinusoidal ringing voltage at the output of the block. The switchingcircuit generates a ringing voltage through the line filter to the output pins of the

Ring Generator unit.

1.3.5 Signal tone generator block

The signal tone generator includes a Wien-bridge oscillator that receives itsoperating voltage from the poles of the input capacitor in the power supply. Thesignal tone generator is continuously operational when the unit is connected to thebattery voltage. Keying has no effect on the signal tone generator. The voltagefrom the oscillator is fed via the transformer to the pins of the unit connector. Thetransformer separates the power supply battery from the output pins of the block.A voltage with the level of 1 V and the frequency of 425 Hz is received from the

connector. The output is protected against short circuits.


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1.4 Technical Specifications

Output of the ring generator

Output voltages 75 VRMS (0 - 10%) or90 VRMS (0 - 10%)

Frequency 16.7 Hz 5%25 Hz 5%50 Hz 5%

Output power (continuous max.) 15 W

Efficiency(UIN = 48 V and Pout =15 W)

> 43 %

Keying pin

Output voltages -20.4 V to -72 V

Frequency approx. 100 mA

Impedance approx. 200 kW

Output of the signal tone generator

Output voltage 1 VRMS10%

Frequency 425 Hz 5%

Output impedance approx. 300 W

Power supply

Input voltage 20.4 V to 72 V

Power dissipation of open-circuit approx. 11 W

Power dissipation of idle state 0.6 W to 3 W

Dimensions and weight

Height 233 mm (6 U)

Width 43 mm (8 3/5 T)

Depth 160 mm

Weight 1.4 kg


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Installation and operation


Chapter 2


There are dangerous voltages in the unit, the covers must NOT beopened when the unit is connected to the operating voltage.

2.1 Introduction

Ring Generator TG 21261 can be installed in any TM4 cartridge or DYNANETsubrack. When installing the unit, take into consideration the following factors:

D Is the operation keyed or unkeyed.

D What is the capacity of the output voltage.

D What is the frequency of the output voltage.

D Will the central battery (CB), local battery (LB) or both be used.

D Will the signal-tone generator be used.

D If the central battery or both batteries are used, the installation is affected bythe selection of Ring Generator output pin (RG1 or RG2) that is connectedonline through the signalling equipment.

D If the central battery is used, the installation is affected by the selection of the

battery that is connected in series with the output of the Ring Generator unit.

The features of the Ring Generator unit can be altered with the jumper settings ofthe jumper settings. See Figure 3 for the location of the jumper settings.

Power for both central battery and local battery ring generators can be suppliedsimultaneously by the same power supply.

Keying of the Ring Generator unit can be controlled only by a unit located in thesame cartridge.


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2.2 Connecting jumper settings

Locations of the jumper settings and their pin numbers are presented in Figure 3.

In order to achieve the required feature, the U-links of the jumper settings must beinstalled in the locations shown in Table 1 to Table 8. The following features canbe set with the jumper settings:

D Set Ring Generator to keyed or unkeyed mode with jumper setting NR1A(see Table 1).

D Select frequency for Ring Generator with jumper setting NR1C (see Table 2).D Set the value of the ringing voltage with jumper setting NR1D (Table 3).D Bring local battery, central battery, or central and local battery into use (see

Table 5 Table 8).

NR1C

NR1D

NR1A14 8

1 7

1 2 3

1

2

4

3

1

17

NR1

A

A

See Figure 5 for a detailed picture of Section AA

Figure 3 Jumper settings

Note In Table 1 to Table 8, the jumper settings written in bold are the defaultsettings. See also Figure 4 for default settings.


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2.2.1 Setting Ring Generator to keyed or unkeyed mode

Jumper setting Keying

On Off

NR1A 78

NR1A 69

Table 1 Setting the Ring Generator to keyed or unkeyed mode (NR1A)

2.2.2 Setting frequency of the ringing voltage

Jumper setting Frequency

16.67 Hz 25 Hz 50 Hz

NR1C 12

NR1C 14

NR1C 23

Table 2 Setting the frequency of the ringing voltage (NR1C)

2.2.3 Selecting ringing voltage

Jumper setting Output voltage

75 V 90 V

NR1D 23

NR1D 12

Table 3 Selecting the value of the ringing voltage (NR1D)


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2.2.4 Bringing local and central batteries into use

1

17

See Figure 3 for the complete view of the Ring Generator unit

2

34

BACK

CONN

ECTOR

NR 1

5

6

7

8

109

11

12

14

13

15

16

Section AA

Uref

RG 1

RG 2

VNB

RVC 23

RG 1

RG 2GND

B1, SV1

B2, SV2

Figure 5 Default jumper settings for NR1 (Section AA)

With jumper setting NR1, you can select the following features:

D Connect the output transformer of the signal tone generator to the output pin.

D Bring the central battery, local battery or both into use.

D Connect one of the output pins online through the signalling equipment, if thecentral battery is in use.

D Connect battery or ground in series with the Ring Generator unit, when thecentral battery is selected.

The following tables show the jumper settings when a particular connection is

required for the Ring Generator unit. Figure 5 shows the default settings for NR 1and also the alternative jumper settings.


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Connecting signal-tone generator

Jumper setting Connected Not connected

NR1 12

NR1 23

Table 4 Connecting the transformer of the signal-tone generator to theoutput (NR1)

Bringing local battery into use

Jumper setting Connected

NR1 45 and 89

Table 5 Bringing the local battery (LB) into use

Bringing central battery into use

Jumper setting Connected Output connected online

NR1 45 and 78 RG1

NR1 89 and 67 RG2

Note that RG 1 or RG 2 can not be connected at the same time

Table 6 Bringing RG 1 or RG 2, and the central battery into use

Jumper setting Connected Battery

NR1 1112 Connect reference voltage(Uref)

1314 B1 / SV1

1415 B2 / SV2

1617 B (operating voltage)

NR1 1011 Ground (GND)

Table 7 Bringing the battery into use that is connected in series with theRing Generator unit output when using the central batteryconnection (NR1)

Note Central battery and the local battery connections can be usedsimultaneously.


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Bringing local battery and central battery into use

Jumper setting Connected Output connected online

NR1 45 and 67 RG1

89 RG2

1112 Reference voltage (Uref) toRG1

NR1 1011 Reference ground (GND)to RG1

Table 8 Using both central battery connection and local battery connectionof the desired output on the line through signalling equipment(NR1)

2.3 Operation

No special measures have to be taken in order to operate the Ring Generator unit.

TG 21261.10 (C33208_20 B0) Operating Instructions

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