tg 21261.10 (c33208_20 b0) operating instructions
TRANSCRIPT
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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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TG 21261.10 Operating Instructions
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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
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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
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Chapter 2
Installation and operation
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.