Specifications

1-33
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
An external facility alarm is detected external to the node because an environmental alarm is present, for
example, a door is open or flooding has occurred.
Procedure: Clear the EXT Alarm
Step 1 Open the AIC card maintenance screen to gather further information about this alarm.
Step 2 Perform your standard operating procedure for this environmental condition.
1.3.43 FAILTOSW
• Major, Service affecting
The FAILTOSW alarm is raised when a working DS-N card cannot switch to the protect card in a 1:N
protection group, because another working DS-N card, with a higher-priority alarm, is switched over and
monopolizing the lone protect card.
Procedure: Clear the FAILTOSW Alarm
Step 1 Lookup and troubleshoot the higher-priority alarm. Clearing this alarm will free up the 1:N card and
clear the FAILTOSW.
Note A higher-priority alarm is an alarm raised on the working DS-N card using the 1:N card
protection group. This working DS-N card is reporting an alarm, but not reporting a
FAILTOSW alarm.
Step 2 Replace the working DS-N card that is reporting the higher-priority alarm. This card is the working
DS-N card using the DS:N card protection and not reporting FAILTOSW.
Replacing the working DS-N card reporting the higher-priority alarm, will allow traffic to revert back to
this slot. This frees up the 1:N card, which can then take over traffic from the card reporting the
lower-priority alarm and the FAILTOSW alarm.
Note When you replace a card with an identical type of card, you do not need to make any changes
to the database.
1.3.44 FAILTOSW-PATH
• Major, Service affecting
The working path did not switch to the protection path on a UPSR. Common causes of this alarm include
a missing or defective protection card or a lockout set on one of the UPSR nodes.