Overvoltage protection scheme for subscriber loops and method of

Details Overvoltage protection scheme for subscriber loops and method of Overvoltage protection scheme for subscriber loops and method of

1992-05-18

1995-02-21

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

379413, 361119, H04M 700

Patent

active

053923499

ABSTRACT:
By opening switches coupling a subscriber loop to circuits in a SLIC when an overvoltage condition occurs, the SLIC is protected from damage. The overvoltage is detected by a overvoltage protector behind the switches. The overvoltage condition is latched and the common control is notified of the condition. The common control may then clear the latch, reclosing the switches. If the overvoltage still exists, the switches are re-opened and maintenance personnel is notified of the fault.

REFERENCES:
patent: 4709296 (1987-11-01), Hung
patent: 4862309 (1989-08-01), Tojo et al.
patent: 4896352 (1990-01-01), Dabin
patent: 4905119 (1990-02-01), Webb
patent: 4941063 (1990-07-01), McCartney et al.
patent: 4947427 (1990-08-01), Rosch et al.
patent: 5146384 (1992-09-01), Markovic et al.
patent: 5161183 (1992-11-01), Maytum
"PBX Line Interface Circuit Design Using The LH1208AAJIC", Application Note, AT&T Microelectronics, Apr. 1991, pp. 1-11.
"LH1208AAJ/AAR PBX Switch Set", Preliminary Data Sheet, AT&T, Jul. 1990 pp. 1-19.

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