02/12/2021

    Failure Evaluating Technology to Promptly Identify Failure Locations in the Light PathNTT Network Service Systems Laboratories

    Overview

    The prompt recovery of facility is wanted at the time of a failure occurrence in the maintenance operation of optical transmission networks. However, it is estimated that the period to evaluate a failure may be elongated in the case in which it is difficult to evaluate a failure based on the checking of alarm-monitoring and/or device logs. For the solution of this, we have been studying the failure evaluating technology to use a variety of performance information on the optical signals gained from optical transmission devices. This technology analyzes the performance information on the optical signals including the influence from failures occurring on transmission paths and identifies the location/cause of the occurrence of such failures.

    Background and existing issues

    Optical cross connections and optical amplifiers are connected in multiple phases for the long-distance transmission in multiple directions on networks of core optical transmission. The device such as these is not equipped with detailed monitoring functions concerning the conditions of optical signals; there may be a case in which a failure is detected only on the reception terminal on an optical path (a module to send and receive client signals) concerning a failure having occurred in the middle of a transmission path. In a case like this, where the quality degradation of optical signals has occurred is not known from device logs; there may be a case in which it is not possible to identify the location or the cause of such failure occurrence.

    Advantages of this technology

    • Even in the case in which it is difficult to identify the location or the cause of a failure occurrence based on the checking of the monitoring and device logs concerning a device alert, the prompt evaluation of the failure is made possible.
    • As for the failures that conventionally take a long time for the isolation of a cause, it is expected that the labor of maintenance operators is reduced and that the period for the recovery of facility is shortened.
    • As a variety of performance information on optical signals is analyzed, this can be applied to the early detection of degradation in performance and malfunction of device.

    Use Scene

    • To isolate failures in optical transmission systems

    Explanatory chart

    Department in charge

    NTT Network Service Systems Laboratories - ·Transport Network Innovation Project

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