Off-hook/on-hook status check circuit

Details Off-hook/on-hook status check circuit Off-hook/on-hook status check circuit

1980-07-30

1982-03-02

Brown, Thomas W.

179 1MN, H04M 100

Patent

active

043179649

ABSTRACT:
An off-hook/on-hook status check circuit is adapted to be connected in series with either the tip (2) or the ring lead (3) of a telephone subscriber loop (1) at a location remote or apart from the telephone station set (13). The circuit comprises an opto-emitter subcircuit (7) in series with a capacitor (4). These are connected in parallel with a pulsing contact (K.sub.1) which alternately permits the charging of the capacitor by the telephone central office voltage or its discharge through the opto-emitter subcircuit. As the capacitor may only be charged when the telephone station set is off-hook drawing loop current, the opto-emitter subcircuit provides a predetermined output when the capacitor discharges, identifying the off-hook condition of the telephone station set. No output from the opto-emitter subcircuit during the capacitor discharge interval identifies the on-hook condition of the set. If the present circuit comprises an element of a dial signaling system (10), the dial pulse signaling system is able to abort dial pulsing when the telephone set is on-hook and continued dial pulsing is not desirable.

REFERENCES:
patent: 3128351 (1964-04-01), Hohmann, Jr. et al.
patent: 3205312 (1965-09-01), Brightman et al.
patent: 3614334 (1971-10-01), Bonvallet
patent: 3819866 (1974-06-01), Hawley
patent: 3932707 (1976-01-01), Connolly et al.
patent: 4001520 (1977-01-01), Waldman et al.
patent: 4171469 (1979-10-01), Brooks
patent: 4209668 (1980-06-01), Weinberger et al.
patent: 4220825 (1980-09-01), Fahey

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