Electronic hybrid circuit for connecting a two-wire line to swit

Details Electronic hybrid circuit for connecting a two-wire line to swit Electronic hybrid circuit for connecting a two-wire line to swit

1977-02-16

1978-04-25

Claffy, Kathleen

H04B 158

Patent

active

040864472

ABSTRACT:
This invention comprises a telephone hybrid circuit having two opto-coupler arrangements for transferring voice signals from the two-wire line to a port of the switching system on one hand and from a port of the switching system to the two-wire line on the other hand. In addition, a pair of feeder circuits in the form of current sources comprising active elements are provided for feeding a constant positive direct current to one wire of the two-wire line and a negative direct current of equal magnitude to the other wire of the two-wire line. Each of the current sources includes control circuitry for maintaining a constant ratio between the current furnished by the current source and a control current common to both current sources. A control current path is connected to the output of one of the opto-coupler arrangements for generating a common control current in response to a dc signal and a superimposed voice signal received from a port of the switching system. The other opto-coupler arrangement couples the signals from the two-wire line to a port of the switching system.

REFERENCES:
patent: 3410961 (1968-11-01), Slana
patent: 3855430 (1974-12-01), Colardelle et al.
patent: 3886322 (1975-05-01), Colardelle et al.
patent: 3909559 (1975-09-01), Taylor
patent: 3970805 (1976-07-01), Thomas
patent: 3987257 (1976-10-01), Place
patent: 4004109 (1977-01-01), Boxall

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