Fault locating system in optical fiber transmission system

Details Fault locating system in optical fiber transmission system Fault locating system in optical fiber transmission system

1979-08-02

1981-03-17

Groody, James J.

Communications: electrical

Continuously variable indicating

Condition responsive

179170F, 17917531R, 34087029, 375 4, 455601, H04B 900, G08C 2500, G08C 1936

Patent

active

042570336

ABSTRACT:
A fault location system in an optical fiber transmission system, in which a plurality of optical signal regenerative repeaters are sequentially connected in cascade in an optical fiber transmission cable at predetermined intervals to transmit digital information in the form of optical signals. Each of the plurality of optical signal regenerative repeaters sends out a fault location information signal composed of an inherent pattern and a fixed pattern when a fault occurs in the corresponding repeater. The inherent pattern is uniquely assigned to the optical signal regenerative repeater from a plurality of individually distinguishable inherent patterns obtained by establishing the start bits of a pseudo-noise sequence at time positions successively delayed from one after another. The fixed pattern is necessary for indicating the time positions of the start bits. A malfunction position in the optical fiber transmission system can be detected by detecting the fault location information signal at a monitor station in the optical fiber transmission system.

REFERENCES:
patent: 3705307 (1972-12-01), Reeves et al.
patent: 3731203 (1973-05-01), Lieberman
patent: 3917916 (1975-11-01), Ghosh
patent: 4047127 (1978-02-01), Mochida et al.

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