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To check for the most common SONET alarms and errors you can encounter when investigating line problems on a Juniper Networks router.

Table 1 provides links and commands for checking SONET alarms and errors.

Table 1: List of Common SONET Alarms and Errors

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