2-60
Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter2 Alarm Troubleshooting
Alarm Procedures

Procedure: Clear the FAN Alarm

Step 1 Verify whether the air filter needs replacement. Complete the “Insp ect, Clea n, and R eplace th e Reusable
Air Filter” procedure on page3-3.
Step 2 If the filter is clean, complete the “Remove and Reinsert Fan-Tray Assembly” procedure on page 2-130.
Note The fan-tray assembly should run immediately when correctly inse rted .
Step 3 If the fan does not run or the alarm persists, complete the “Replace the Fan-Tray Assembly” procedure
on page 3-1.
Step 4 If the replacement fan-tray assembly does not operate correctly, log onto http://www.cisco.com/tac for
more information or call TAC to report a service-affecting problem (1-800-553-2447).
2.6.63 FANDEGRADE
•Major (MJ), Non-Service Affecting (NSA)
The Partial Fan Failure Speed Control Degradation (F ANDEGRADE) alarm occurs if fan speed for one
of the fans in the fan-tray assembly falls under 500 RPM w hen re ad by a t ac hom etry c ou nter.

Procedure: Clear the FANDEGRADE Alarm

Step 1 Complete the “Clear the FAN Alarm” procedure on page 2-60.
Step 2 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.64 FE-AIS
•Not Alarmed (NA), Non-Service Affecting (NSA)
The Far-End AIS condition occurs when an AIS has occurred at the far-end node. FE-AIS usually occurs
in conjunction with an LOS (OC-N) alarm (see page 2-84) downstream.

Procedure: Clear the FE-AIS Condition

Step 1 Complete the “Clear the AIS Condition” procedure on page 2-16.
Step 2 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).