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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter2 Alarm Troublesho oting Alarm Procedures
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15327.
Plug the wristband cable into the ESD jack located between the top high-speed and XTC slots.

Procedure: Clear the FAILTOSW Condition

Step 1 Look up and troubleshoot the higher-priority alarm. Clearing the higher-priority condition frees the 1:N
electrical card or 1+1 optical card and clears the FAILTOSW.
Step 2 If the condition does not clear, replace the working card that is reporting the higher priority alarm by
following the “Physically Replace a Card” procedure on page 2-130. This card is the working optical
card using the 1+1 protection and not reporting FAILTOSW.
Replacing the working electrical card that is reporting the higher-priority alarm allows traffic to revert
to the working slot and the card reporting the FAILTOSW to switch to the protect card.
Note When replacing a card with an identical type of card, no additional CTC provisioning is
required.
Step 3 If the condition does not clear, log onto http://www.cisco.com/tac for more information or call TAC
(1-800-553-2447).
2.6.59 FAILTOSW-PATH
•Not Alarmed (NA), Non-Service Affecting (NSA)
The Fail to Switch to Protection Path (FAILTOSW-PATH) condition occurs when the working path does
not switch to the protection path on a UPSR. Common causes of the FAILTOSW-P ATH alarm include a
missing or defective protection card or a lock out set on one of the U PSR nod es.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15327.
Plug the wristband cable into the ESD jack located between the top high-speed and XTC slots.

Procedure: Clear the FAILTOSW-PATH Condition in a UPSR Configuration

Step 1 Look up and clear the higher priority alarm. Clearing this alarm frees the standby card and clear s the
FAILTOSW-PATH condition.
Note A higher-priority alarm is an alarm raised on the working DS-N card using the 1:N card
protection group. The working DS-N card is reporting an alarm but not reporting a FAILTOSW
condition.