Communication system and a method, to detect a power exposure of

Details Communication system and a method, to detect a power exposure of Communication system and a method, to detect a power exposure of

1991-10-18

1993-06-22

Schreyer, Stafford

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 32, 379 24, 379 26, 379 29, H04M 124, H04B 346

Patent

active

052221199

ABSTRACT:
A telephone system comprises a multi-channel transmission apparatus for connecting a subscriber line to a telephone exchanger, where the transmission apparatus comprises: a subscriber interface for interfacing said subscriber line; a detecting circuit in the subscriber interface for detecting a change in a voltage on the subscriber line; and a discriminating circuit for discriminating whether the change detected by the detecting circuit is continuous or intermittent, upon discriminating the detected change in voltage as intermittent the discriminating circuit outputs a first alarm signal. The discriminating circuit may be formed of a software counter which counts a number of the intermittent signals for a predetermined period. The software counter does not require a bulky and expensive components, such as a 60 Hz filter. If the counted number is larger than a predetermined number the signal is determined to be intermittent. The first alarm signal may start a subscriber line tester which includes an AC voltage tester to measure an AC voltage on the subscriber line. If the measured AC voltage exceeds a predetermined criterion, it is determined that a power exposure has happened. This method allows a quick and correct detection of power exposure by merely adding a program into a currently provided micro processor, without requiring additional component.

REFERENCES:
patent: 4197435 (1980-04-01), Jackson et al.

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