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This equipment is connected to a divisional office DTMF exchange and allotted a distinctive subscriber number (say 8888). The existing 4 Wire Trans and Receive lines can also be connected to this equipment so that a remote location (say an accident spot) in a 4 wire area can access the exchange located in the divisional office. Special DTMF equipment provided at the remote location will become a subscriber of the divisional office exchange through this interface. Divisional office can dial the remote telephone and vice versa.
The equipment has all the hardware required to interface a 2 Wire telephone exchange to a 4 Wire telephone in a remote area. In addition it can also respond to special DTMF signals from the remote 4 wire telephone to connect it to the local exchange. The equipment is housed in a compact module which can be easily interconnected to the exchange and the underground cable pairs. Indications are provided to monitor the status of the line during ringing and conversation.
| Tummala Product Code: | TEL/AEI/98 |
| Operating voltage: | 12 Volts DC |
| Current consumption: | < 25 mA (Stand by) < 100mA during conversation |
| Exchange ringing voltage detection range: | 40 to 100 Volts rms |
| Signalling mode: | Standard DTMF codes as per CCITT |
| Signalling Level: | -7 dB |
| Indications: | Power ON, Auto EXCH. ON. Ring ON. |
| Size: | X x X x X |
| Weight: | 2 kgs |