Specifications

1-37
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
1.3.47 FAN
• Two or more fan failure: Critical, Service affecting
• One fan failure: Major, Non-service affecting
The fan alarm indicates a problem with the fan-tray assembly. When the fan is not fully functional, the
temperature of the ONS 15454 can rise above its normal operating range. The fan tray contains six fans
and needs a minimum of five working fans to properly cool the ONS 15454. 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.
Plug the wristband cable into the ESD jack located on the lower-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.
Step 3 Reinsert the fan tray making sure the back of the fan tray connects to the rear of the ONS 15454.
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, log on to http://www.cisco.com/tac for more
information or call the Cisco Technical Assistance Center to report a service-affecting problem
(1-877-323-7368).
1.3.48 FE-AIS
• Not Alarmed (NA) (Condition)
The far-end DS-3 node is reporting an alarm indication signal (AIS). The prefix FE in an alarm message
means the main alarm is occurring at the far-end node and not at the node reporting this FE-AIS alarm.
Troubleshoot the FE alarm by troubleshooting the main alarm at its source. Both the alarms clear when
the main alarm clears.
Procedure: Clear the FE-AIS Condition on the DS3XM-6 or DS3E Cards in C-bit Format
Step 1 To troubleshoot an FE alarm, determine which node and card link directly to the card reporting the FE
alarm. For example, an FE-AIS alarm from the DS3XM-6 card in Slot 12 of Node 1 may link to the main
AIS alarm from an DS3XM-6 card in Slot 6 of Node 2.
Step 2 Log into the node that links directly to the card reporting the FE alarm.