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Diagnostic method of equipment and system using the same

  • US 4,858,224 A
  • Filed: 01/05/1988
  • Issued: 08/15/1989
  • Est. Priority Date: 01/09/1987
  • Status: Expired due to Fees
First Claim
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1. A diagnostic method in a line equipment including a plurality of receiving circuits for receiving respective input signals and for converting the input signals into a plurality of sub-highways, a multiplexer connected to said plurality of receiving circuits for multiplexing the sub-highway to configure a highway having a plurality of time slots, a time division switch connected to said multiplexer for exchanging time slots of an information sequence including said highway, a demultiplexer connected to said time division switch for demultiplexing said highway outputted from said time division switch into a plurality of sub-highways, and a plurality of transmitting circuits connected to said demultiplexer for respectively transmitting said sub-highways, comprising the steps of:

  • providing each of said receiving circuits with a circuit for inserting a specific sequence into filling time slots of a corresponding sub-highway;

    exchanging, by said time division switch, each filling time slot over a specific route in accordance with said specific sequence inserted therein;

    providing each of said transmitting circuits with an error detection circuit for detecting whether an error exists in said specific sequence inserted into filling time slots supplied by a specific route, wherein each of said error detection circuits are connected to a specific route by said time division switch;

    effecting, when one of said error detection circuits detects an error, a route change of the filling time slots supplied thereto by said time division switch; and

    predicting a location of occurrence of a failure depending on a change in a detection state of said error detection circuits in association with said route change.

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