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List of Common SONET Alarms and Errors

Purpose

Table 34 provides links and commands for the most common SONET alarms and errors you can encounter when investigating line problems on a Juniper Networks router.

Action

Table 34: List of Common SONET Alarms and Errors

Tasks

Command or Action
Display SONET Alarms and Errors

show interfaces so-fpc/pic/port extensive

Locate Most Common SONET Alarms and Errors  
  1. Locate Loss of Signal Alarms

Check the connection between the router port and the first SONET network element.

  1. Locate Alarm Indication Signal Alarms

Downstream from the router, check the path-terminating equipment, section-terminating equipment, and line-terminating equipment for a loss of signal or loss of frame.

  1. Locate Remote Defect Indication Alarms

Upstream from the router, check the path-terminating equipment, section-terminating equipment, and line-terminating equipment for a loss of signal or loss of frame.

  1. Locate Remote Error Indication Line Errors

Upstream from the router, check the line-terminating equipment and path-terminating equipment for an error in the B2 or B3 byte.

  1. Locate Bit Error Rate Alarms

Check the following:

  • Optical fiber
  • Optical transmitter and receiver
  • Clocking
  • Attenuation in the optical signal
  1. Locate Payload Label Mismatch Path Alarms

Check the received and transmitted C2 byte.
  1. Locate Loss of Pointer Path Alarms

Check that both sides of the connection are configured for concatenate or nonconcatenate mode.

  1. Locate Unequipped Payload Alarms

Check provisioning with the SONET provider, and if possible, check the configuration of the add/drop multiplexer (ADM).

  1. Locate Phase Lock Loop Alarms

Investigate the timing source, and configure the clocking to external or internal depending on the situation.

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