Troubleshooting ISDN-PRI endpoints (wideband)

Last Updated : Jan 11, 2024 |

About this task

This procedure describes a layered approach for troubleshooting problems with an ISDN-PRI endpoint. Because problems at lower layers affect upper layers, layers are investigated from low to high. In this procedure, the layers are investigated in the following order:

  • DS1 facility is Layer 1

  • Procr Layer 2

  • PRI endpoint’s ports are Layer 3

    Note:

    This troubleshooting procedure is limited to diagnosing faults between the switch and the ISDN-PRIs. Problems encountered on the network side of a wideband connection or problems with end-to-end equipment compatibility are beyond the scope of this section.

Procedure

  1. If there are alarms or errors against any of the following maintenance objects, resolve those alarms or errors in the order listed at left by following procedures for the appropriate MO in Avaya Aura® Communication Manager Alarms, Events, and Logs Reference.

    • UDS1-BD

    • PKT-INT

    • SYS-LINK

    • ISDN-LNK

    • ISDN-SGR

    • PE-BCHL

  2. If there are no alarms or errors, at the endpoint, check the status of the endpoint equipment or terminal adaptor.
  3. If the status of the endpoint equipment or terminal adaptor indicates a problem, follow repair procedures recommended by the provider of the terminal adapter or endpoint equipment.
  4. If the administration at the endpoint and on the switch are inconsistent, correct the administration so that both ends match. If both ends already match, check if every call fails, or are the failures transient.
  5. If every call fails, check the health of the application equipment, for example, the video codec and that of the S8700 Media Server network. If constant failures persist, follow normal escalation procedures.
  6. Use list measurements ds1 to check for bit errors over the DS1 interface between the switch and the terminal adapter or endpoint equipment.
  7. If bit errors are confirmed, perform an in-depth analysis of the DS1 interface including premises distribution wiring, endpoint equipment, and any other possible source of noise. If the problem cannot be isolated, follow normal escalation procedures. If the problem is isolated, check for alarms and errors against SYNC.
  8. If a synchronization source is stable, or the system does not switch synch sources, follow normal escalation procedure.