On-hook/off-hook status check circuit

Details On-hook/off-hook status check circuit On-hook/off-hook status check circuit

H - Electricity

04

M

379/57

H04M 3/22 (2006.01) H04M 1/82 (2006.01)

Patent

CA 1154183

BIGGS-3 ON-HOOK/OFF-HOOK STATUS CHECK CIRCUIT Abstract of the Disclosure_ An off-hook/on-hook status check circuit is adapted to be connected in series with either the tip or the ring lead of a telephone subscriber loop at a location remote or apart from the telephone station set. The circuit comprises an opto-emitter subcircuit in series with a capacitor. These are connected in parallel with a pulsing contact 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 pulse signaling system, 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.

378140

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