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:
Mar. 17, 1981
Filed:
Aug. 02, 1979
Kokusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
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.