Telephone instrument

Details Telephone instrument Telephone instrument

1987-06-08

1989-12-12

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379387, 379424, H04M 131

Patent

active

048872954

ABSTRACT:
Telephone instruments generally comprise a mechanical hookswitch connected across the pair of speech wires. This specification discloses solid state hookswitch circuitry comprising a switching transistor controlled by a hookswitch and connected in series with the output of a rectifier, the rectifier being connected directly to the incoming speech wires. Because the hookswitch controls a switching transistor, rather than having to switch line voltages directly, any reliable low current make/break switch may be employed.

REFERENCES:
patent: 4360710 (1982-11-01), Chaput et al.
patent: 4465903 (1984-08-01), Barber
patent: 4492823 (1985-01-01), James et al.
patent: 4506112 (1985-03-01), Bitsch
patent: 4647787 (1987-03-01), Pommer, II
patent: 4653088 (1987-03-01), Budd et al.
patent: 4756021 (1988-07-01), Nakayama

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