Circuit for detection of off-hook condition of extension telepho

Details Circuit for detection of off-hook condition of extension telepho Circuit for detection of off-hook condition of extension telepho

1985-05-09

1987-03-03

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379164, H04M 100

Patent

active

046477233

ABSTRACT:
A solid state circuit designed to be incorporated into a telephone terminal instrument to provide a visual indication at that instrument that a telephone line to which the instrument is connected is already in use by another telephone instrument.

REFERENCES:
patent: 3395256 (1968-07-01), Limiero et al.
patent: 4394544 (1983-07-01), De Leon

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