Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent
1993-06-09
1994-10-25
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
361119, 361124, 337 32, H02H 100, H02H 104
Patent
active
053596579
ABSTRACT:
An overvoltage protection apparatus used with a pair of telephone lines includes first voltage clamping circuitry for clamping voltage signals on the lines at a first predetermined voltage potential. The first voltage clamping circuitry is formed by at least a pair of solid-state protective chip devices and a failure mode mechanism adapted for connecting the lines to ground responsive to increased temperature of the solid-state protective chip device and providing a ground connection for the pair of solid-state protective chip devices. A pair of current limiting resistors operatively connected to the failure mode mechanism provide sneak current protection.
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Dwyer James L.
Oneac Corporation
Weaver Scott L.
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