Communications: electrical – Continuously variable indicating – Condition responsive
Patent
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.
Ota Chuichi
Sakaguchi Haruo
Seki Norio
Adams Bruce L.
Burns Robert E.
Groody James J.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
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