Right-of-way control circuit for key telephone intercommunicatio

Details Right-of-way control circuit for key telephone intercommunicatio Right-of-way control circuit for key telephone intercommunicatio

1976-05-28

1977-07-12

Claffy, Kathleen H.

H04M 172

Patent

active

040355888

ABSTRACT:
A circuit for controlling multiple signalling sources within a key telephone system for the establishment of priorities. The circuit inhibits connection to, or permits disconnection of a secondary signal source from a selected amplifier whenever a primary signal source is connected to the same amplifier. Circuitry is also provided to indicate the disconnect condition.

REFERENCES:
patent: 2850579 (1958-09-01), Carter
patent: 3887774 (1975-06-01), Takubo et al.
patent: 3965308 (1976-06-01), Jones et al.

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