Fault detecting system for duplexing type local area networks

Details Fault detecting system for duplexing type local area networks Fault detecting system for duplexing type local area networks

1990-04-18

1992-05-19

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324534, 324535, 324642, 370 17, 379 26, G01R 3111

Patent

active

051151995

ABSTRACT:
In a fault detecting system suitable for the carrier band type LAN regulated by IEEE, and employed in each of stations coupled with each other via LAN, there are provided: a signal trail detector for detecting a signal trail of a solicit-successor frame contained in a transmission signal thereby to produce a trail start-timing detection signal; a carrier detector for detecting a carrier signal component contained in a reflection signal of the signal trail, which has been reflected from a fault occurrence place on the local area network, within a response window frame, thereby to produce a reflection end-timing detection signal; a timer unit for measuring a time period after the trail start-timing signal is produced from the signal trail detector until the reflection end-timing detection signal is produced from the carrier detector; and, a processor for processing the time periods derived from the timer unit of the fault detecting systems employed in the first and second stations so as to calculate a distance from the fault occurrence place on LAN to each of the first and second stations.

REFERENCES:
patent: 2315450 (1943-03-01), Nyquist
patent: 2931975 (1960-04-01), Bechtel
patent: 3462681 (1969-08-01), Biskup
patent: 4500834 (1985-02-01), Ko et al.
patent: 4970466 (1990-11-01), Bolles et al.

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