Electronic trigger switch for maintenance termination unit

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

1985-11-26

1987-08-04

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of network terminating interface, subscriber trunk...

307632, H04B 346

Patent

active

046851208

ABSTRACT:
A telephone maintenance termination unit utilizes a low voltage, bidirectional trigger switch. 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: 4169220 (1979-09-01), Fields
patent: 4373121 (1983-02-01), Sartori et al.
patent: 4396809 (1983-08-01), Brunssen
General Electric Co., SCR Manual, p. 110 (6th ed., 1979).
Teccor Electronics, Inc., General Catalog: Semiconductor Devices, pp. 8-9, 95-103 (1982).
Bell System Technical Reference, Maintenance Termination Unit Specification, pp. 1-20 (A.T. & T., Apr. 1983).
Circuit diagram prepared by applicants, Feb., 1986.

Affiliated with

Also associated with

Rating

Electronic trigger switch for maintenance termination unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic trigger switch for maintenance termination unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic trigger switch for maintenance termination unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-887797