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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.60 FAN-DEGRADE
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 STM-N card. It could be necessary to manually switch
traffic carrying circuits over to a protection path. Refer to the
“2.8.2 Protection Switching, Lock
Initiation, and Clearing” section on page 2-123
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 15600 SDH 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 STM-N card receiver specifications. The
“1.9.3 Optical Traffic Card Transmit and Receive Levels”
lists these specifications.
Step 11
Repeat Steps
through
for any other ports on the card.
Step 12
If the optical power level for all STM-N cards is within specifications, complete the
for the protect standby STM-N card.
Caution
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing” section on page 2-123
for commonly used traffic-switching procedures.
Note
When you replace a card with the identical type of card, you do not need to make any changes
to the database.
Step 13
If the condition does not clear after you replace the MS-SPRing cards on the node one by one, follow
Steps
through
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).
2.6.60 FAN-DEGRADE
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: FAN
The Partial Fan Failure Speed Control Degradation alarm occurs if fan speed for one of the fans in the
fan-tray assembly falls under 500 RPM when read by a tachometry counter.
Clear the FAN-DEGRADE Alarm
Step 1
Complete the
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