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    FAULT LOCATION METHOD
    1.
    发明专利
    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

    Applicant: STC PLC

    Inventor： TOOMASU OZUWARUDO ,  IAN JIYONSON HAASUTO

    IPC: G01R31/08 ,  H04B10/00 ,  H04B10/02 ,  H04B10/08 ,  H04B17/40

    Abstract: 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.

    DETECTION OF FAULT POSITION FOR SUBMARINE OPTICAL FIBER CABLE
    2.
    发明专利
    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

    Applicant: STC PLC

    Inventor： TOOMASU OZUWARUDO

    IPC: G01R17/10 ,  G01R31/08 ,  H04B10/00

    Abstract: 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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