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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 Loss of Signal Alarms
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Remote Error Indication Line Errors
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
Locating Bit Error Rate Alarms
Problem
Bit error rate (BER) alarms are declared when the number of BIP-B2 errors hits a certain threshold. Depending on the threshold, there are two types of BER alarms. In both cases the interface is taken down.
- Bit error rate-signal degrade (BERR-SD) is declared when a bit error rate of 10^-6 is reached.
- Bit error rate-signal failure (BERR-SF) is declared when a bit error rate of 10^-3 is reached.
Solution
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
The following sample output displays a BERR-SD error:
user@router2> show interfaces so-1/1/1 extensive [... Output truncated...]
Active alarms : BERR-SD
Active defects : BERR-SD
SONET PHY: Seconds Count State
PLL Lock 0 0 OK
PHY Light 0 0 OK
SONET section:
BIP-B1 22 101
SEF 0 0 OK
LOS 0 0 OK
LOF 0 0 OK
ES-S 22
SES-S 0
SEFS-S 0
SONET line:
BIP-B2 22 103
REI-L 0 0
RDI-L 0 0 OK
AIS-L 0 0 OK
BERR-SF 0 0 OK
BERR-SD 11 53 Defect Active
ES-L 22
SES-L 4
UAS-L 2
ES-LFE 0
SES-LFE 0
UAS-LFE 0
SONET path:
BIP-B3 22 166
REI-P 0 0
LOP-P 0 0 OK
AIS-P 0 0 OK
RDI-P 0 0 OK
UNEQ-P 0 0 OK
PLM-P 0 0 OK
ES-P 22
SES-P 3
UAS-P 1
ES-PFE 0
SES-PFE 0
UAS-PFE 0
Meaning
Bit error rates can be caused by any of the following situations:
- Degrading optical fiber
- Optical transmitter or receiver problems
- Dirty fiber-optic connector
- Clocking issues
- Too much attenuation in the optical signal
- BIP-B1 and BIP-B3 are not used in the BER alarm calculations
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 Loss of Signal Alarms
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Remote Error Indication Line Errors
- 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 Loss of Signal Alarms
- Locating Alarm Indication Signal Alarms
- Locating Remote Defect Indication Alarms
- Locating Remote Error Indication Line Errors
- Locating Payload Label Mismatch Path Alarms
- Locating Loss of Pointer Path Alarms
- Locating Unequipped Payload Alarms
- Locating Phase Lock Loop Alarms
