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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15454 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the LOF Alarm on E1-N-14 Card
Step 1 Verify that the line framing and line coding match between the E1-N-14 port and the signal source:
a. In CTC, note the slot and port reporting the alarm.
b. Find the coding and framing formats of the signal source for the card reporting the alarm. Your
network administrator has this information.
c. Display the card-level view of the reporting card.
d. Click the Provisioning > Line tabs.
e. Verify that the line type of the reporting port matches the line type of the signal source.
f. If the signal source line type does not match the reporting port, click Type and enter the correct type.
g. Click Apply.
Step 2 If the alarm does not clear when the coding and framing of the ONS 15454 SDH match the coding and
framing of the signal source, replace the E1-N-14 card.
Note When replacing a card with an identical type of card, you do not need to change the CTC
database.
1.5.45 LOF (STM-N)
• Critical, Service-affecting
The LOF alarm means the receiving ONS 15454 SDH has lost frame delineation in the incoming data.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15454 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the LOF Alarm on the STM-N Card
Step 1 Verify that the line framing and line coding match between the STM-N port and the signal source:
a. In CTC, note the slot and port reporting the alarm.
b. Find the coding and framing formats of the signal source for the card reporting the alarm. Your
network administrator has this information.
c. Display the card-level view of the reporting card.
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