The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1994
Filed:
Oct. 17, 1991
Masahiro Shinbashi, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
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.