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System and method for automatically detecting root causes of switching connection failures in a telephone network

  • US 5,392,328 A
  • Filed: 02/04/1993
  • Issued: 02/21/1995
  • Est. Priority Date: 02/04/1993
  • Status: Expired due to Term
First Claim
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1. A system for operating an analog telephone switching machine having a first plurality of paired line link and trunk link networks, each of the paired networks having a second plurality of sequentially interlinked switch stages, each of the switch stages having multiple grids with input levels and output levels interconnectable at crosspoints by respective relay switches and interconnectable between switch stages by links to form call connection paths, and pulse order objects being provided in a third plurality of pulse paths for energizing the crosspoint relays, the system comprising:

  • a controller for generating network call connection orders and operating the pulse devices to implement the network orders;

    said controller generating a post-connection continuity check and generating an error message if the continuity check indicates that the ordered connection has failed;

    means for processing the error messages generated over time to identify the root cause of connection failures;

    said processing means having means for identifying failed crosspoints from error messages that represent failed crosspoints; and

    said processing means having means for identifying failed pulse path objects from error messages that represent failed pulse paths.

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