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1. 发明专利

JPH04223627A FAULT LOCATION METHOD 失效
公开(公告)号：JPH04223627A
公开(公告)日：1992-08-13
申请号：JP8115191
申请日：1991-03-22
申请人： STC PLC
发明人： TOOMASU OZUWARUDO , IAN JIYONSON HAASUTO
IPC分类号： G01R31/08 , H04B10/00 , H04B10/02 , H04B10/08 , H04B17/40
摘要： PURPOSE: To provide a simple method applicable even in the case that a fault is an intermittent electric fault in the case of locating the fault of the certain submarine long distance optical transmission system of plural optical relay system. CONSTITUTION: Connection is performed from a first terminating part TERM1 on the ground under a water surface to a second terminating part TERM2 on the ground through plural optical repeaters. Counters 1 and 2 at the respective terminating parts count frame alignment word(FAW) pulses and the counters 1 and 2 are started by the injection of a single error at the transmission rack 4 of the terminating part 2 by pulses from a pulse generator 5. When a signal error arrives at the other terminating part 1 after the delay of Nt clock pulses, the counter 1 is started. When a high voltage fault is present, the error is simultaneously generated on all fibers. Since propagation time from a fault part to the terminating part depends on the fault, the position of the fault is decided by a counted number on the stopped counter.

2. 发明专利

JPH02259477A DETECTION OF FAULT POSITION FOR SUBMARINE OPTICAL FIBER CABLE 失效
公开(公告)号：JPH02259477A
公开(公告)日：1990-10-22
申请号：JP33458989
申请日：1989-12-22
申请人： STC PLC
发明人： TOOMASU OZUWARUDO
IPC分类号： G01R17/10 , G01R31/08 , H04B10/00
摘要： PURPOSE: To detect the position of the failure of a repeating communication cable containing the surge protective device of a repeater by measuring the resistance of the cable by setting the protective device in a conducting state in a lowresistance state by eliminating normal power supply from the end of the cable. CONSTITUTION: The resistance of a repeating communication cable is measured at the terminal of an electrical conductor in the cable by effectively setting the surge protective device of a repeater in a conducting state in a low- resistance state by eliminating normal power supply from the end of the cable and impressing a current modulated to the electrical conductor at a terminal having a polarity and amplitude sufficient to reduce the effect of the polarity when a failure occurs. Therefore, the position of the failure of the cable including the surge protective device can be detected.

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