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ManualsBrandsCisco ManualsComputer equipment15454-TCC - Network Processor Card
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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
Note When you replace a card with an identical type of card, you do not need to make any changes
to the database.
1.3.70 LOF (EC-1)
• Critical, Service affecting
A port on the reporting EC-1 card has a LOF condition. LOF indicates that the receiving ONS 15454 has
lost frame delineation in the incoming data. LOF occurs when the SONET overhead loses a valid framing
pattern for 3 milliseconds. Receiving two consecutive valid A1/A2 framing patterns clears the alarm.
LOF on an EC-1 card is sometimes an indication that the EC-1 card reporting the alarm expects a specific
line rate and the input line rate source does not match the input line rate of the optical receiver.
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 LOF Alarm on the EC-1 Card
Step 1 The LOF should trigger an automatic protection switch away from the working card that reported the
alarm. If it did not, do a manual switch to move traffic away from the reporting card:
a. At the node view, click the Maintenance > Protection tabs.
b. Double-click the protection group that contains the reporting card.
c. Click the Protect/Standby card of the selected groups.
d. Click Manual and OK.
Step 2 Clear the manual switch:
a. At the node view, click the Maintenance >Protection tabs.
b. Double-click the protection group that contains the reporting card.
c. Highlight either selected group.
d. Click Clear and click YES at the confirmation dialog box.
Note If you do not have a protect card for the reporting card, create a new circuit on the
reporting card to achieve the same effect.
Step 3 If you still receive the LOF alarm, 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).