Hold circuit for telephone

Details Hold circuit for telephone Hold circuit for telephone

1976-01-12

1977-03-08

Cooper, William C.

179 99, H04M 100

Patent

active

040114139

ABSTRACT:
An electronic hold circuit for a telephone. A single sensing and latching module is connected across the telephone lines, and is adapted to sense the voltage present on the telephone lines to distinguish between on-hook, off-hook and hold conditions. The hold feature is engagable by one or more hold signaling modules disposed, for example, near each telephone and extension telephone in the system. Each hold signaling module comprises a switch associated with a level establishing device, for establishing a voltage on the telephone lines at a level intermediate the relatively high on-hook voltage and the relatively low off-hook voltage. The sensing and latching module responds to this intermediate level by latching the telephone lines at a voltage sufficiently low to maintain the connection with the called or calling party.

REFERENCES:
patent: 3246082 (1966-04-01), Levy
patent: 3598924 (1971-08-01), Zucker
patent: 3725600 (1973-04-01), Hutton
patent: 3742151 (1973-06-01), Ruether
patent: 3870831 (1975-03-01), McCarley

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