2-54
Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter2 Alarm Troubleshooting
Alarm Procedures
Note EXERCISE-SPAN-REQ is an informational condition. It does not require troubleshooting.
2.6.56 EXT
•Minor (MN), Non-Service Affecting (NSA)
A Failure Detected External to the NE (EXT) alarm occurs because an environmental alarm is present,
for example, a door is open or flooding has occurred.

Procedure: Clear the EXT Alarm

Step 1 In node view, click the Maintenance tab to gather further information about the EXT alarm.
Step 2 Perform your standard operating procedure for the environmental condition.
Step 3 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.57 EXTRA-TRAF-PREEMPT
•Major (MJ), Service Affecting (SA)
An Extra Traffic Preempted (EXTRA-TRAF-PREEMPT) alarm occurs on OC-N cards in two-fiber
BLSRs because low-priority traffic directed to the protect system has been preempted by a working
system protection switch.

Procedure: Clear the EXTRA-TRAF-PREEMPT Alarm

Step 1 Verify that the protection switch has occurred by checking the Conditions tab.
Step 2 If a ring switch has occurred, clear the alarm on the working system by following the appropriate alarm
procedure in this chapter.
Step 3 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.58 FAILTOSW
•Not Alarmed (NA), Non-Service Affecting (NSA)
The Failure to Switch to Protection (FAILTOSW) condition occurs when a working electrical or optical
(traffic) card cannot switch to the protect card in a pr otection group, because another working electrical
or optical card with a higher-priority alarm has switched to the protect card.