Locate SONET Alarms and Errors

This chapter describes the most common SONET alarms and errors you can encounter when investigating line problems on a Juniper Networks router. (See Table 31.) For a useful reference for details on SONET interfaces, refer to the Telcordia/Bellcore Standard GR-253 CORE, available from www.telcordia.com.

Table 31: List of Common SONET Alarms and Errors

SONET Alarm and Error Tasks	Command or Action
Display SONET Alarms and Errors	show interfaces so-fpc/pic/port extensive
Locate Most Common SONET Alarms and Errors
Locate Loss of Signal Alarms	Check the connection between the router port and the first SONET network element.
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.
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.
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.
Locate Bit Error Rate Alarms	Check the following: Optical fiber Optical transmitter and receiver Clocking Attenuation in the optical signal
Locate Payload Label Mismatch Path Alarms	Check the received and transmitted C2 byte.
Locate Loss of Pointer Path Alarms	Check that both sides of the connection are configured for concatenate or nonconcatenate mode.
Locate Unequipped Payload Alarms	Check provisioning with the SONET provider, and if possible, check the configuration of the add/drop multiplexer (ADM).
Locate Phase Lock Loop Alarms	Investigate the timing source, and configure the clocking to external or internal depending on the situation.