Integrated ringing circuit and a ring trip circuit for the same

Details Integrated ringing circuit and a ring trip circuit for the same Integrated ringing circuit and a ring trip circuit for the same

H - Electricity

04

M

379/16

H04M 19/02 (2006.01)

Patent

CA 1272318

ABSTRACT OF THE DISCLOSURE A constant current circuit, including a constant current source which draws a current and a constant current source which sends a current, is connected to a two-wire subscriber line. A ringing signal made up of constant stream of positive and negative current signals is transmitted to the telephone line. The OFF-hook condition of a telephone set is detected by comparing the output voltage of a constant current circuit with a reference voltage for ring trip.

549555

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