Excavating
Patent
1991-10-17
1994-06-28
Harvey, Jack B.
Excavating
371 48, 375 20, G06F 1100
Patent
active
053253663
ABSTRACT:
A line monitoring system for a station in a communication system in which communication with an asynchronous third-digital-stage signal is made through a communication network with which the main station and an interface device, on the sides of subscribers, are connected. Each interface device is provided with an abnormality detection device for detecting abnormality in the network and abnormality in the asynchronous third-digital-stage signal and an insertion device for inserting the output of the abnormality detection device into a special bit of the asynchronous third-digital-stage signal. On the other hand, the main station is provided with alarm receiving device performing frame synchronization of the asynchronous third-digital-stage signal output from the insertion device for deciding the state of the special bit. By virtue of the present line monitoring system monitoring an alarm for a station, when a fault occurs in the line on the side of subscriber or in the transmitted signal, the fault can be detected by the main station immediately.
REFERENCES:
patent: 3988676 (1976-10-01), Whang
patent: 4271526 (1981-06-01), Flora
patent: 4282601 (1981-08-01), Flora
patent: 4503546 (1985-03-01), Yoshine et al.
patent: 4910750 (1990-03-01), Fisher
Fujitsu Limited
Harvey Jack B.
Pipala Edward
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