Cisco ONS 15454 Troubleshooting Manual page 426

2.7.383 SSM-DUS
Clear the SQM Alarm
For the errored circuit, complete the
Step 1
Recreate the circuit using the "Create Circuits and VT Tunnels" chapter of the Cisco ONS 15454
Step 2
Procedure Guide.
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
Step 3
for more information or call Cisco TAC 1 800 553-2447 in order to report a Service-Affecting (SA)
problem.
2.7.383 SSM-DUS
The Synchronization Status (SSM) Message Quality Changed to Do Not Use (DUS) condition occurs
when the synchronization status message (SSM) quality level degrades to DUS or is manually changed
to DUS.
The signal is often manually changed to DUS to prevent timing loops from occurring. Sending a DUS
prevents the timing from being reused in a loop. The DUS signal can also be sent for line maintenance
testing.
SSM-DUS is an informational condition and does not require troubleshooting.
Note
2.7.384 SSM-FAIL
The SSM Failed alarm occurs when the synchronization status messaging received by the ONS 15454
fails. The problem is external to the ONS 15454. This alarm indicates that although the ONS 15454 is
set up to receive SSM, the timing source is not delivering valid SSM messages.
Clear the SSM-FAIL Alarm
Step 1 Verify that SSM is enabled on the external timing source.
Step 2 If timing is enabled, use an optical test set to determine that the external timing source is delivering SSM.
For specific procedures to use the test set equipment, consult the manufacturer.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-232
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: BITS, DS1, E1, OCN
DWDM Logical Object: TRUNK
Single Failure Default Severity: Minor (MN), Non-Service-Affecting (NSA); Double Failure
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Objects: BITS, DS1, E1, OCN
DWDM Logical Object: TRUNK
"Delete a Circuit" procedure on page
Chapter 2 Alarm Troubleshooting
2-275.
November 2009