Apsb - Cisco NCS 2000 series Troubleshooting Manual

APSB

SUMMARY STEPS
1. Check the incoming fiber connection and clean them.
2. Check the regulation points (VOA and amplifiers) along the optical path upstream of the OMP-AMP-17-C
card.
DETAILED STEPS
Step 1
Check the incoming fiber connection and clean them.
Step 2 Check the regulation points (VOA and amplifiers) along the optical path upstream of the OMP-AMP-17-C card.
If the condition does not clear, log into the Technical Support Website at
for more information or call Cisco TAC (1 800 553-2447).
APSB
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: OCN, STMN
The APS Channel Byte Failure alarm occurs when LTE detects protection switching byte failure or an invalid
switching code in the incoming APS signal. Some older SONET not manufactured by Cisco send invalid APS
codes if they are configured in a 1+1 protection group with newer SONET nodes.
Clear the APSB Alarm
SUMMARY STEPS
1. Use an optical test set to examine the incoming SONET overhead to confirm inconsistent or invalid
K bytes. For specific procedures to use the test set equipment, consult the manufacturer. If corrupted
K bytes are confirmed and the upstream equipment is functioning properly, the upstream equipment might
not interoperate effectively with the NCS.
2. If the alarm does not clear and the overhead shows inconsistent or invalid K bytes, you could need to
replace the upstream cards for protection switching to operate properly. Complete the
a Card, on page 453
DETAILED STEPS
Step 1
Use an optical test set to examine the incoming SONET overhead to confirm inconsistent or invalid K bytes. For specific
procedures to use the test set equipment, consult the manufacturer. If corrupted K bytes are confirmed and the upstream
equipment is functioning properly, the upstream equipment might not interoperate effectively with the NCS.
Step 2
If the alarm does not clear and the overhead shows inconsistent or invalid K bytes, you could need to replace the upstream
cards for protection switching to operate properly. Complete the
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
122
procedure.
http://www.cisco.com/c/en/us/support/index.html
Physically Replace a Card, on page 453
Alarm Troubleshooting
Physically Replace
procedure.