Line interface circuit

Details Line interface circuit Line interface circuit

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1298678

LINE INTERFACE CIRCUIT Abstract of the Disclosure A telephone line interface circuit includes a transformer with tip and ring windings connected between tip and ring feed resistors and tip and ring leads of a telephone line, for feeding energizing current from a telephone facility to the telephone line. A secondary winding in combination with the tip and ring windings couples a.c. signals between the facility and the telephone line. A capacitance device is connected in combination with the secondary winding to simulate a function of a capacitance device as would normally be connected between the tip and ring windings in prior art circuits. The telephone line interface circuit is particularly useful in association with battery reversal responsive telemetry devices as any tendency for false ringer activation, in a connected telephone set, is reduced. -i-

593758

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