2-22
Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter2 Alarm Troubleshooting
Alarm Procedures
Step 4 If two nodes have the same node ID number, complete the “Change a Node ID Number” procedure on
page 2-126 to change one node’s ID number so that each node ID is u niqu e.
Note If the node names shown in the network view do not correlate with the node IDs, log into each
node and click the Provisioning > BLSR tabs. The BLSR window shows the node ID of the
login node.
Note Applying and removing a lock out on a span causes the ONS 15327 to generate a new K byte.
The APSCNMIS alarm clears when the node receives a K byte containing the correct node ID.
Step 5 If the alarm does not clear, use the “Lock Out a BLSR Span” procedure on page2-1 27 to lock out the
span.
Step 6 Complete the “Clear a BLSR Span Lock Out” procedure on page 2-127 to clear the lock out.
Step 7 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC to report
a service-affecting problem (1-800-553-2447).
2.6.11 APSMM
•Minor (MN), Non-Service Affecting (NSA)
An APS Mode Mismatch failure (APSMM) alarm occurs when there is a mismatch of the protection
switching schemes at the two ends of the span. If one node is p rovisi one d f or bidir ect iona l sw itch ing ,
the node at the other end of the span must also be provisioned for bidirectional switching. If one end is
provisioned for bidirectional and the other is provisioned for u nidi rec tio nal, an A PSMM al arm oc cu rs
in the ONS node that is provisioned for bidirectional. The APSMM alarm occurs in a 1+1 configuration.

Procedure: Clear the APSMM Alarm

Step 1 For the reporting ONS 15327, display the node view and verify the protection scheme provisioning:
a. Click the Provisioning > Protection tabs.
b. Choose the 1+1 protection group configured for the OC-N cards.
The chosen protection group is the protection group optically connected (with DCC connectivity) to
the far end.
Record whether the Bidirectional Switching check box is checked.
Step 2 Log into the far-end node and verify that the OC-N 1+1 protection group is provisioned.
Step 3 Verify that the Bidirectional Switching check box matches the checked or unchecked condition of the
box recorded in Step 1. If not, change it to match.
Step 4 Click Apply.
Step 5 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).