Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Including fault responsive disconnection of tested component
Patent
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.
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Darveau Joseph F. M.
Hung Paul F.
Rosch Reinhard W.
Rosenbaum Stanley D.
Sutherland Brian A. F. S.
Chin Stephen
Haley R. John
Loomis Paul
Northern Telecom Limited
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