Electronic common switch having an improved receiver mating arra

Details Electronic common switch having an improved receiver mating arra Electronic common switch having an improved receiver mating arra

1982-07-07

1984-04-10

Pellinen, A. D.

179 84VF, H04M 126

Patent

active

044423225

ABSTRACT:
In a telephone substation employing a dual tone multi-frequency signal generator, the common switch functions of disabling the transmitter and muting the receiver are performed by transistor devices responsive to a control signal produced by the signal generator. A bias voltage provided by the transistor device associated with the transmitter prevents dialing signals from reverse biasing the transistor device associated with the receiver and defeating receiver muting.

REFERENCES:
patent: 4087638 (1978-05-01), Hayes et al.
patent: 4315108 (1982-02-01), Hoffman et al.
patent: 4332984 (1982-06-01), Davis et al.

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