Electronic trigger switch for maintenance termination unit

Details Electronic trigger switch for maintenance termination unit Electronic trigger switch for maintenance termination unit

1988-07-21

1989-05-02

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of network terminating interface, subscriber trunk...

307256, H04B 346

Patent

active

048274976

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.

REFERENCES:
patent: 4373121 (1983-02-01), Sartori et al.
patent: 4396809 (1983-08-01), Brunssen

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