Interference limiting two-port network for 1+1 type transmission

Details Interference limiting two-port network for 1+1 type transmission Interference limiting two-port network for 1+1 type transmission

1982-02-22

1983-11-29

Rubinson, G. Z.

Multiplex communications

Wide area network

Packet switching

370 72, H04J 100

Patent

active

044182457

ABSTRACT:
The present invention relates to 1+1 type carrier telephone transmission systems for connecting two subscriber terminals to a telephone exchange via a common two-wire link, one of the terminals being connected via the conventional audio channel, and the other terminal being connected by a channel referred to as a super-audio channel. Disturbances caused in the super-audio channel by signalling, dialling and calling signals of the audio channel are reduced by inserting a current-limiting two-port network in series in the audio channel and at the exchange end of the 1+1 system, in between the filter which separates out the audio channel and the rest of the exchange. Advantageously, an interference limiting low-pass filter (50) is also placed in series on the audio circuit. It has a capacitive shunt arm with a mid point connected to exchange battery ground.

REFERENCES:
patent: 4210779 (1980-07-01), Simokat

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