Electronic telephone circuit for subscriber-line

Details Electronic telephone circuit for subscriber-line Electronic telephone circuit for subscriber-line

H - Electricity

04

M

379/67

H04M 19/00 (2006.01)

Patent

CA 1114084

ABSTRACT A subscriber line circuit comprises two electronic circuits for supplying the subscriber set with feed current via the telephone pair, and for simulating an inductive impedance. The circuits detect current variations on the line due to signalling conditions at the subscriber set. Two hysteresis threshold comparators recognize voltage variations in the electronic circuits due to signalling conditions, and emit corresponding driving currents when the variations lie within a predetermined range. In this way, interference problems arising from the use of a common power supply for a number of subscriber sets are eliminated by relatively simple circuitry.

328048

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