SCOPE :-
This system is used for emergency communication in tunnel. This unit is used by the Station Master. When there is an emergency in tunnel, driver of the train having 2W / 4W Portable Control Telephone with Code Generator working on 3V DC of ACES make can communicate with the Station Master by inserting “6 Pin Emergency Plug” of Portable Control Telephone into the socket. Driver of the train can call Station Master by pressing CALL button given on Portable Control Telephone in 4 wire mode only even if the Tunnel System is in Standby mode. This is Hand Free system.
FEATURES :-
-
The unit works on 12V DC / 2Amp Supply.
-
Table top model.
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Cabinets are of M.S. and duly Powder Coated in Siemens Gray Colour.
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Glassy Epoxy Printed Circuit Boards with Green Masking is used.
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Transmitting & Receiving Signal :- Hand free
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Transmitter :- Condenser Microphone.
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Receiver :- External 4” Speaker.
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Dialing on DTMF Principle.
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Volume Control: – Only for Receiving.
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The system has “PRESS TO CALL” facility. When the selective Switch at caller unit is operated for other Receiver Unit, a DTMF Signal is transmitted to the Receiver Unit. There will be Visual and Audio alarm indications on the receiver unit, which attracts the attention at other end.
-
Indications:-
A. Incoming Ring :-
i) Visual : Yellow LED
ii) Audio : Buzzer for audible tone.
B. Power ON :- Green LED
-
Incoming Ring through Pizzo Buzzer even Power supply Switch is in OFF Position.
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On getting an Audio & Video indication, the Caller unit will Switch ON the system and starts the conversation, without operating any Switch.
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ON / OFF Switch – ON for communication & OFF for incoming Ring.
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Equipment is protected from:
Surge & transients current from lightning.
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Suitable to work with “2W / 4W Portable Control Telephone with Code Generator” working on 3V DC in ABS Cabinet of ACES make in 4 wire mode only.
TECHNICAL SPECIFICATIONS:-
|
SR. NO. |
TESTS |
RANGE |
|
1 |
4W TRANS EFFICIENCY |
> +3.8dBm |
|
2 |
4W TRANS DISTORTION |
< 3% |
|
3 |
4W TRANS FREQUENCY RESPONSE |
+/- 3dB |
|
4 |
4W RECEIVE EFFICIENCY |
> -26dBm |
|
5 |
4W RECEIVE DISTORTION |
< 3% |
|
6 |
4W RECEIVE FREQUENCY RESPONSE |
+/- 3dB |
|
7 |
4W INSERTION LOSS (LISTEN) |
< 0.5dB |
|
8 |
4W INSERTION LOSS (TALK) |
< 1.0dB |
|
9 |
4W CODE |
0dBm to -7dBm |
|
10 |
IDLE CURRENT |
< 50mA |
|
11 |
TALK CURRENT | |
| a) At V / C min. |
< 150mA |
|
| b) At V / C max. |
< 300mA |
|
|
12 |
RING CURRENT |
< 120mA |
All Technical & Mechanical specifications are subject to change, without prior notice, for better performance & up gradation.
End.
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