Ringtrip judging circuit

Details Ringtrip judging circuit Ringtrip judging circuit

1995-11-13

1997-11-04

Bost, Dwayne

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379382, 379377, H04M 100

Patent

active

056848749

ABSTRACT:
A ringtrip judging circuit includes a single comparator for comparing a detection value of a ringing current with a threshold value and for outputting the result of the comparison, a threshold value control circuit for supplying the threshold value to the comparator, and a judging circuit for judging ringtrip based on the output of the comparator. During a prescribed period after ringing signal transmission, the threshold value control circuit changes the threshold value in a steplike manner in accordance with the result of the comparison, thereby determining a threshold value greater than a peak value during the prescribed period, and based on it, determines a threshold value for ringtrip judgement and supplies it to the comparator.

REFERENCES:
patent: 4455456 (1984-06-01), Cochran
patent: 4677664 (1987-06-01), Siligoni et al.
patent: 5293420 (1994-03-01), Nagato
patent: 5402482 (1995-03-01), Minohara

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