Protection and recovery of telephone line interface circuits

Details Protection and recovery of telephone line interface circuits Protection and recovery of telephone line interface circuits

1993-04-01

1995-02-14

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 26, 379 34, 379377, 379412, 361 71, 361119, H04M 124, H04M 100, H04M 908, H04M 926

Patent

active

053902319

ABSTRACT:
An automatic protection and recovery method for a telephone line interface circuit is described. The interface circuit monitors current on the line, and in the event of a fault producing an excessive current a protection relay interrupts a connection of the interface circuit to the line, and the interface circuit monitors common mode voltage on the line. The interface circuit is reconnected in response to the monitored voltage being below a relatively high threshold. If a second interruption results, the interface circuit is then reconnected in response to the monitored voltage being below a lower threshold. If a further interruption results, the interface circuit enters a ground fault recovery process. The method facilitates protection and rapid recovery from arbitrary fault conditions on the telephone line.

REFERENCES:
patent: 4385336 (1983-05-01), Takeshita et al.
patent: 4709296 (1987-11-01), Hung et al.
patent: 4720845 (1988-01-01), Lechner et al.
patent: 4897872 (1990-01-01), Siligoni et al.
patent: 4947427 (1990-08-01), Rosch et al.
patent: 5003588 (1991-03-01), Winegerath
patent: 5146384 (1992-09-01), Markovic et al.
patent: 5222119 (1993-06-01), Asano

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