Telephonic communications – Polystation line system
Patent
1985-07-10
1987-10-13
Schreyer, Stafford D.
Telephonic communications
Polystation line system
379 26, 379387, H04M 320
Patent
active
047003804
ABSTRACT:
A solid state remotely actuable switch includes at least one solid state bilateral switch having a first and a second terminal connected in series with the telephone circuit and a gate for rendering the switch conductive between the terminals in response to a specific gate trigger current. A solid state unilateral switch is provided for each bilateral switch, which includes first and second terminals and a gate for actuating the unilateral switch between the terminals in response to a telephone operation voltage. A diode bridge circuit having positive and negative terminals connects the gate and second terminal of the bilateral switch to the first and second terminals of the unilateral switch. A solid state avalanche device is connected between the first terminal of the unilateral switch and the positive terminal of the bridge circuit. The unilateral switch is rendered nonconductive in response to a control signal from the central office to render the bilateral switch nonconductive for disconnecting the remote circuit.
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