Als; Apsb; Clear The Apsb Alarm - Cisco ONS 15600 SDH Troubleshooting Manual

2.6.2 ALS

If the condition does not clear, log into the Technical Support Website at
Step 3
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447).
2.6.2 ALS
For information about this condition, refer to the "Alarm Troubleshooting" chapter of the
Cisco ONS 15454 DWDM Troubleshooting Guide.

2.6.3 APSB

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 SDH nodes not manufactured by Cisco
send invalid APS codes if they are configured in a 1+1 protection scheme with newer SDH nodes, such
as the ONS 15600 SDH. These invalid codes cause an APSB alarm on an ONS 15600 SDH.
APS switches are hitless on the ONS 15600 SDH.
Note

Clear the APSB Alarm

Step 1 Use an optical test set to examine the incoming SDH 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 ONS 15600 SDH.
Always use the supplied electrostatic discharge wristband when working with a powered
Caution
ONS 15600 SDH. Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf
assembly.
Step 2 If the alarm does not clear and the overhead shows inconsistent or invalid K bytes, you might need to
replace the upstream cards for protection switching to operate properly. Complete the
Card" procedure on page
For the ONS 15600 SDH, removing a card that currently carries traffic on one or more ports can cause
Caution
a traffic hit. To avoid this, perform an external switch if a switch has not already occurred. See the
"2.8.5 Verify or Create Node DCC Terminations" section on page 2-139
troubleshooting procedures.
Note
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
2-16
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: STMN
2-134.
When you replace a card with the identical type of card, you do not need to make any changes
to the database.
Chapter 2 Alarm Troubleshooting
"Replace an I/O
for commonly used alarm
July 2010