Cisco ONS 15454 SDH Specifications Page 31

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1-7
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
1.5 Alarm Procedures
This section lists alarms alphabetically. Each alarm or condition topic gives the severity, description and
troubleshooting procedure.
1.5.1 APSB
Minor, Non-service affecting
The channel byte failure alarm occurs when line terminating equipment detects protection-switching
byte failure in the incoming automatic protection-switching (APS) signal. This happens when an
inconsistent APS byte or invalid code is detected. Some older, non-Cisco SDH nodes send invalid APS
codes if configured in a 1+1 protection scheme with newer SDH nodes, such as the ONS 15454 SDH.
These invalid codes will raise an APSB on an ONS node.
Procedure: Clear the APSB Alarm
Step 1 Examine the incoming SDH overhead with an optical test set to confirm inconsistent or invalid K bytes.
Step 2 If corrupted K bytes are confirmed and the upstream equipment is functioning properly, the upstream
equipment may not interoperate effectively with the ONS 15454 SDH. For ONS 15454 SDH protection
switching to operate properly, the upstream equipment may need to be replaced.
1.5.2 APSCDFLTK
Minor, Non-service affecting
The default K byte received alarm occurs when an MS-SPRing is not properly configured. For example,
it occurs when a four-node MS-SPRing has one node configured as an SNCP ring. A node in an SNCP
or 1+1 configuration does not send the two valid K1/K2 APS bytes anticipated by a system configured
for MS-SPRing. One of the bytes sent is considered invalid by the MS-SPRing configuration. The K1/K2
byte is monitored by receiving equipment for link-recovery information. The alarm can also be caused
when a new node is added but a new ring map has not been accepted.
Warning
The ONS 15454 SDH is a Class I (CDRH) and Class 1M (IEC) laser system.
Warning
Invisible laser radiation may be emitted from the aperture ports of the single-mode fiber optic
modules when no cable is connected. Avoid exposure and do not stare into open apertures.
Procedure: Clear the APSCDFLTK Alarm
Step 1 Prior to accepting a new mapping table, verify that each node has a unique node ID number:
a. Log into a node on the ring.
b. Click the Provisioning > Ring tabs.
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