Privacy circuit for key telephone systems

Details Privacy circuit for key telephone systems Privacy circuit for key telephone systems

1974-08-08

1976-03-02

Claffy, Kathleen H.

179 32, H04M 170

Patent

active

039419436

ABSTRACT:
In key telephone systems where a plurality of stations have access to a line by merely depressing a line key, a circuit is provided to prevent that station from entering a busy line. The circuit uses a single relay per station to provide a normal condition of privacy for any line at a station to equipped. The circuit senses the condition of the line and on a busy condition, the station cannot access the busy line. By providing all stations of a key group with privacy circuits, all stations can have complete privacy on line calls. Privacy control is possible on less than all stations of a system and less than all lines by selective deployment of privacy circuits. Optionally, a privacy release button can be provided to allow a station to enable other stations to access that busy line. Protection has been built into the circuit against transient surges and the like.

REFERENCES:
patent: 3725601 (1973-04-01), Jetzt et al.
patent: 3819866 (1974-06-01), Hawley
patent: 3860763 (1975-01-01), Sudoh et al.

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