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2.6.60 FAN-DEGRADE
If fiber continuity to the ports is good, use an optical test set to verify that a valid signal exists on the
Step 8
line. For specific procedures to use the test set equipment, consult the manufacturer. Test the line as close
to the receiving card as possible.
Using an optical test set disrupts service on the STM-N card. It could be necessary to manually switch
Caution
traffic carrying circuits over to a protection path. Refer to the
Initiation, and Clearing" section on page 2-123
If the signal is valid, clean the fiber according to site practice. If no site practice exists, complete the
Step 9
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
section on page 1-74
Repeat Steps
Step 11
If the optical power level for all STM-N cards is within specifications, complete the
Step 12
Card" procedure on page 2-134
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
Caution
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing" section on page 2-123
Note
Step 13
If the condition does not clear after you replace the MS-SPRing cards on the node one by one, follow
Steps
If the condition does not clear, log into the Technical Support Website at
Step 14
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447).
2.6.60 FAN-DEGRADE
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
Complete the
Step 1
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
2-56
lists these specifications.
7
through
10
for any other ports on the card.
When you replace a card with the identical type of card, you do not need to make any changes
to the database.
4
through
12
for each of the nodes in the ring.
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: FAN
"Clear the FAN-FAIL Alarm" procedure on page
for commonly used switching procedures.
"1.9.3 Optical Traffic Card Transmit and Receive Levels"
for the protect standby STM-N card.
for commonly used traffic-switching procedures.
Chapter 2 Alarm Troubleshooting
"2.8.2 Protection Switching, Lock
"Replace an I/O
"2.8.2 Protection Switching,
2-57.
July 2010
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Table of Contents
Troubleshooting
