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

1984-04-16

1985-08-13

Rubinson, Gene Z.

179 18AH, H04M 322, H04M 714

Patent

active

045352011

ABSTRACT:
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.

REFERENCES:
patent: 3936614 (1976-02-01), Suntop
patent: 4002850 (1977-01-01), Richards et al.
patent: 4079208 (1978-03-01), Rogers et al.
patent: 4190745 (1980-02-01), Josinskas, Jr. et al.
patent: 4194230 (1980-03-01), Danford
patent: 4221936 (1980-09-01), Vaughan
patent: 4310725 (1982-01-01), Mehaffey
patent: 4385336 (1983-05-01), Takeshita et al.

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