Specifications

1-33
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
1.5.33 FAN
• Critical, Service-affecting
The failure of the cooling-fan-tray alarm indicates a problem with the fan-tray assembly. When the fan
is not fully functional, the temperature of the ONS 15454 SDH 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 ONS 15454 SDH. However, even with five working fans, the fan tray can 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 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the FAN Alarm
Step 1 Check the condition of the air filter to see if it needs replacement.
Step 2 If the filter is clean, take the fan-tray assembly out of the ONS 15454 SDH.
Step 3 Reinsert the fan tray making sure the back of the fan tray connects to the rear of the ONS 15454 SDH.
Note The fan should run immediately when correctly inserted.
Step 4 If the fan does not run or the alarm persists, replace the fan tray.
Step 5 If the replacement fan tray does not operate correctly, login to http://www.cisco.com/tac for more
information or login to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a
directory of Cisco Technical Assistance Center toll-free numbers for your country.
1.5.34 FEPRLF
• Minor, Non-service affecting
The far end protection line failure alarm means that there was an APS switching channel failure of signal
on the protect card coming into the node.
Note The FEPRLF alarm only is raised on the ONS 15454 SDH when 1+1 bidirectional protection is used on
optical cards in a 1+1 configuration.
Procedure: Clear the FEPRLF Alarm on an MS-SPRing
Step 1 To troubleshoot the FE alarm, determine which node and card link directly to the card reporting the FE
alarm. For example, an FE alarm/condition on a card in Slot 12 of Node 1 may link to the main alarm
from a card in Slot 6 in Node 2.
Step 2 Log into the node that links directly to the card reporting the FE alarm.