Subset switching means in apparatus for a key telephone system f

Details Subset switching means in apparatus for a key telephone system f Subset switching means in apparatus for a key telephone system f

1976-11-29

1978-03-28

Cooper, William C.

H04Q 300

Patent

active

040816150

ABSTRACT:
In an attachment apparatus for a key telephone system of the type which permits a plurality of intercom substations to access a trunk telephone line via a common communication circuit, a novel subset operable switching circuit is disclosed that permits each subset access to said common communication circuit only on an individual one-at-a-time basis. Transistor circuitry is provided to lock out other stations when more than one subset tries to gain access at the same time.

REFERENCES:
patent: 3254158 (1966-05-01), Mallery et al.
patent: 3892929 (1975-07-01), Shylo

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