Constant current line circuit with class features

Details Constant current line circuit with class features Constant current line circuit with class features

H - Electricity

04

M

H04M 19/00 (2006.01)

Patent

CA 2342557

A line circuit utilizing a differential amplifier whose output is regulated to zero volts D.C. (when the subscriber's set is off hook) by a negative feedback circuit, for controlling a voltage controlled power supply which provides a constant current feed to the subscriber's loop. The differential amplifier also transmits audio signals received from the subscriber's loop directly to a PABX via an unbalanced terminal. When the loop range exceeds a predetermined threshold, the circuit reverts to a voltage feed operation thereby allowing operation over long loop lengths and the ability to provide on-hook CLASS services.

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