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:
Aug. 29, 1995
Filed:
Sep. 30, 1993
Yoshiyuki Inoue, Kawasaki, JP;
Makoto Sumitani, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A fault locating method and submarine equipment for detecting the location of a fault developed in a communication system including an optical submarine cable and submarine equipment such as repeaters and branching units inserted in the cable, which is supplied with operating current via a feed line of the cable. The submarine equipment has a main processing circuit for transmitting signals via the submarine cable; an power unit inserted in the feed line so as to supply operating power for the main processing circuit by receiving the operating current from the feed line; a nonlinear resistance device which is connected to the feed line and the resistance value of which increases as a current flowing through it decreases, and a charging/discharging resistor disposed in parallel to the nonlinear resistance device. The fault locating method detects the location of an open-circuit fault occurring in the cable by measuring the capacitance of the open-circuit cable. The capacitance measurement is quickly and accurately carried out by charging and discharging the cable capacitance through the charging/discharging resistor.