Protection arrangement for a telephone subscriber line interface

Details Protection arrangement for a telephone subscriber line interface Protection arrangement for a telephone subscriber line interface

1989-10-12

1990-08-07

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

361102, 361119, 361 56, H02H 320, H04M 700

Patent

active

049474278

ABSTRACT:
A telephone subscriber line is connected to a SLIC via contacts of an isolation relay. Line voltage on the line side of the relay contacts, and line current on the SLIC side of the relay contacts, are detected during opposite polarity half-cycles of an a.c. fault on the line, and the contacts are opened to protect the SLIC if the voltage and/or current is excessive. The interruption of current causes the line voltage to rise to maintain the protection for the duration of a fault.

REFERENCES:
patent: 4563547 (1986-01-01), Booth
patent: 4571460 (1986-02-01), Rosenbaum et al.
patent: 4585905 (1986-04-01), Brown
patent: 4618743 (1986-10-01), Falater
patent: 4661979 (1987-04-01), Jakab
patent: 4709296 (1987-11-01), Hung et al.
patent: 4718084 (1988-01-01), Dragotin
"AM 7950", Advanced Micro Devices, Jun. 1984 and Jun. 1985.
"Switching Device for Use in Limiting Voltage on Customer Lines", L. R. Card et al., Western Electric Technical Digest, No. 64, Oct. 1981, pp. 7-8.

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