Electronic trigger switch for maintenance termination unit
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United States of America Patent
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May 2, 1989
Issued Date -
N/A
app pub date -
Jul 21, 1988
filing date -
Nov 26, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telephone maintenance termination unit utilizes a low voltage, bidirectional trigger switch for performing diagnostic functions on a telephone line. The trigger switch provides low voltage, low current triggering in conjunction with a high holding current requirement. The trigger switch may comprise either two silicon controlled rectifiers connected in inverse parallel relationship with their gates connected, a bidirectional diffused PNPN semiconductor device, or an NPN semiconductor device, any one of which is used to trigger a power control TRIAC. In another embodiment, the switching device may be a two-terminal, unitary semiconductor device incorporating the functions of both the TRIAC and the bidirectional trigger switch.
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