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Related Documentation
- M, T Series
- List of Common SONET Alarms and Errors
- Displaying SONET Alarms and Errors
- Locating Most Common SONET Alarms and Errors
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Remote Error Indication Line Errors
- Locating Bit Error Rate Alarms
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
Locating Loss of Signal Alarms
Problem
A loss of signal (LOS) alarm indicates that there is a physical link problem with the connection to the router receive port from the neighboring SONET equipment transmit port.
Solution
To locate the LOS alarm, check the connection between the router port and the first SONET network element. In the example network in Figure 1, the X indicates that there is a connection problem between Repeater 2 and Router 2.
Figure 1: Location of an LOS Alarm in a SONET Network
To display SONET alarms and errors, use the following Junos OS CLI operational mode command:
user@host> show interfaces so-fpc/pic/port extensive
Sample Output
user@router2> show interfaces so-1/1/1 extensive
[... Output truncated...]
Active alarms : LOL, PLL, LOS
Active defects : LOL, PLL, LOF, LOS , SEF, AIS-L, AIS-P, PLM-P
SONET PHY: Seconds Count State
PLL Lock 51 0 PLL Lock Error
PHY Light 51 0 Light Missing
SONET section:
BIP-B1 0 0
SEF 51 0 Defect Active
LOS 51 0 Defect Active
LOF 51 0 Defect Active
[...Output truncated...]
Meaning
The sample output shows at the time the command was run, Router 2 continued to be in a LOS alarm state for around 51 seconds.
Related Documentation
- M, T Series
- List of Common SONET Alarms and Errors
- Displaying SONET Alarms and Errors
- Locating Most Common SONET Alarms and Errors
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Remote Error Indication Line Errors
- Locating Bit Error Rate Alarms
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
Published: 2012-12-10
Related Documentation
- M, T Series
- List of Common SONET Alarms and Errors
- Displaying SONET Alarms and Errors
- Locating Most Common SONET Alarms and Errors
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Remote Error Indication Line Errors
- Locating Bit Error Rate Alarms
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
