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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.106 FAN
e. If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and choose
IS. Click Apply.
Note If a port in the IS admin state does not receive a signal, the LOS alarm is raised and the port
service state transitions to OOS-AU,FLT.
Step 7 If the OC-N cards are active and in service, verify fiber continuity to the ports on the recorded cards. To
verify fiber continuity, follow site practices.
Step 8 If fiber continuity to the ports is good, use an optical test set to verify that a valid signal exists on the
line. For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close
to the receiving card as possible.
Caution Using an optical test set disrupts service on the OC-N card. It could be necessary to manually switch
traffic carrying circuits over to a protection path. Refer to the “2.9.2 Protection Switching, Lock
Initiation, and Clearing” section on page 2-262 for commonly used switching procedures.
Step 9 If the signal is valid, clean the fiber according to site practice. If no site practice exists, complete the
procedure in the “Maintain the Node” chapter in the Cisco ONS 15454 Procedure Guide.
Step 10 If cleaning the fiber does not clear the condition, verify that the power level of the optical signal is within
the OC-N card receiver specifications. The “1.12.3 OC-N Card Transmit and Receive Levels” section
on page 1-146 lists these specifications.
Step 11 Repeat Steps 7 through 10 for any other ports on the card.
Step 12 If the optical power level for all OC-N cards is within specifications, complete the “Physically Replace
a Traffic Card” procedure on page 2-273 for the protect standby OC-N card.
Step 13 If the condition does not clear after you replace the BLSR cards on the node one by one, follow
Steps 4 through 12 for each of the nodes in the ring.
Step 14 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC 1 800 553-2447.
2.7.106 FAN
Default Severity: Critical (CR), Service-Affecting (SA)
SONET Logical Object: FAN
The Fan Failure alarm indicates a problem with the fan-tray assembly. When the fan-tray assembly is not
fully functional, the temperature of the ONS 15454 can rise above its normal operating range.
The fan-tray assembly contains six fans and needs a minimum of five working fans to properly cool the
shelf. However, even with five working fans, the fan-tray assembly could need replacement because a
sixth working fan is required for extra protection against overheating.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
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