Duplex telephone signalling system

Details Duplex telephone signalling system Duplex telephone signalling system

1977-07-27

1978-08-29

Cooper, William C.

179 43, H04M 702

Patent

active

041105656

ABSTRACT:
Disclosed is circuitry interfacing telephone branch or trunk lines to provide D.C. driving voltages in response to, for example, on-hook and off-hook signals from a telephone set. The disclosed circuitry employs both lines to transmit useful signalling information to achieve, substantially, a doubling of the line voltage and a reduction of the common-mode burden on a differential voltage comparator for sensing the signalling information. These results are obtained with lower power dissipation than prior art systems.

REFERENCES:
patent: 3610834 (1971-10-01), Guelgenpfennig

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