Ground start detection in telephone loop signalling circuit

Details Ground start detection in telephone loop signalling circuit Ground start detection in telephone loop signalling circuit

H - Electricity

04

M

379/56, 379/57

H04M 3/22 (2006.01) H04M 19/02 (2006.01) H04Q 1/38 (2006.01)

Patent

CA 1201229

GROUND START DETECTION IN TELEPHONE LOOP SIGNALLING CIRCUIT Abstract of the Disclosure A circuit configuration for a telephone loop signalling circuit, for detecting a ground start condition on a telephone line. The circuit operates without modification under both loop start and ground start conditions in the presence of heavily induced power line voltages. The circuit configuration utilizes two line current detectors, one driven via a low pass filter to control a D-type flip-flop which controls a ground start condition applied to the line. The other detector resynchronizes a normally free-running clock to the start of each half-cycle whenever current is detected on the line. The clock in turn also controls the set/reset times of the D-type flip-flop.

451895

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