Telephone circuit monitoring system

Details Telephone circuit monitoring system Telephone circuit monitoring system

1975-03-28

1978-01-03

Claffy, Kathleen H.

179 71R, H04M 1538

Patent

active

040668436

ABSTRACT:
A telephone circuit monitoring system includes sampling means for repeatedly sampling the bistate and linear (a-c and d-c) control signals concurrently on a plurality of trunk circuits. When any of the circuits go off-hook, a central control initiates the sampling operation and repeatedly directs the sampling of the linear signals and bistate signals of each of a plurality of off-hook circuits until the monitoring purpose has been served.

REFERENCES:
patent: 3551598 (1970-12-01), de Varda et al.
patent: 3562436 (1971-02-01), Lutgenau
patent: 3651269 (1972-03-01), Le Strat et al.
patent: 3760110 (1973-09-01), Joel, Jr.
patent: 3825689 (1974-07-01), Baichtal et al.
patent: 3835257 (1974-09-01), McLaughlin
patent: 3852533 (1974-12-01), Henrickson et al.
patent: 3870823 (1975-03-01), Gayler et al.
patent: 3925623 (1975-12-01), Tysseland

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