Fault locating system capable of quickly locating a fault in a h

Details Fault locating system capable of quickly locating a fault in a h Fault locating system capable of quickly locating a fault in a h

1990-07-11

1993-02-23

Atkinson, Charles E.

Excavating

371 204, 371 251, 371 26, G01R 3128

Patent

active

051896745

ABSTRACT:
In a fault locating system for use in combination with a communication network of a hierarchy comprising a plurality of communication units which are divisible into a plurality of layers, each of the communication units produces, on occurrence of a fault, first, second, and third alarm signals Iu, Id, and Ou representative of interruption of an input signal from an upper communication unit, interruption of an input signal from a lower communication unit, and interruption of an output signal to an upper communication unit. A pattern of the first through the third alarm signals Iu to Ou is extracted from three specific communication units and is monitored to locate the fault. In order to locate multiple faults, the first through the third alarm signals are erased after a single fault is located to monitor whether or not alarm signals remain without an erasure. Similar operation is repeated until no alarm signal remain. The three specific communication units may be composed of a highest communication unit located at a highest layer in faulty communication units, a counterpart communication unit of the highest communication unit, and an upper communication unit of the counterpart communication unit.

REFERENCES:
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patent: 4709366 (1987-11-01), Scott et al.
patent: 4719625 (1988-01-01), Bell et al.
patent: 4872165 (1989-10-01), Mori et al.
patent: 5046034 (1991-09-01), Stark et al.
Japanese Paper No. 1791, Imada et al., "Fault Discrimination Method for Supervision of Communication Network", 1987 National Convention of The Institute of Electronics, Information & Communication Engineers, Mar. 26-29, 1987.

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