Key telephone system optically coupled protective coupler

Details Key telephone system optically coupled protective coupler Key telephone system optically coupled protective coupler

1977-11-03

1979-01-02

Stellar, George G.

H04M 100

Patent

active

041328701

ABSTRACT:
There is disclosed a protective coupler circuit of the circuit breaker type having a relay contact inserted in the communication line between the key telephone station and the central office in order to protect the central office line from hazardous voltages. A longitudinal unbalance detector is coupled with a metallic high voltage detector to control the relay operation. Circuitry is provided to operate in conjunction with the ring detection circuitry of the key telephone unit to insure proper circuit operation when ringing potential is present on the communication line even though that potential is over the threshold level of the hazardous voltage protector.

REFERENCES:
patent: 3925624 (1975-12-01), Earle et al.

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