Cisco NCS 2000 series Troubleshoot Manual

Logical Object: TRUNK, EQPT
The Optical Transport Unit (OTU) Loss of Multiframe alarm is an OTN alarm for the trunk port and occurs
when the Multi Frame Alignment Signal (MFAS) is corrupted. The alarm applies to MXP_2.5G_10G,
TXP_MR_10G, TXP_MR_2.5G, TXP_MR_10E, TXP_MR_10E_C, TXP_MR_10E_L, TXPP_MR_2.5G,
ADM-10G, and OTU2_XP cards when the MFAS) overhead field is errored for more than five frames and
persists for more than 3 milliseconds.
Clear the LOM Alarm
SUMMARY STEPS
1. Ensure that the fiber connector for the card is completely plugged in. For more information about fiber
connections and card insertion, refer to the Turn Up a Node chapter in the Configuration guide.
2. If the bit error rate (BER) threshold is correct and at the expected level, use an optical test set to measure
the power level of the line to ensure it is within guidelines. For specific procedures to use the test set
equipment, consult the manufacturer.
3. If the optical power level is good, verify that optical receive levels are within the acceptable range.
4. If receive levels are good, clean the fibers at both ends according to site practice. If no site practice exists,
complete the fiber cleaning procedure in the Maintain the Node chapter in the Configuration guide.
5. If the condition does not clear, verify that single-mode fiber is used.
6. If the fiber is of the correct type, verify that a single-mode laser is used at the far-end node.
7. Clean the fiber connectors at both ends for a signal degrade according to site practice.
8. Verify that a single-mode laser is used at the far end.
9. If the problem does not clear, the transmitter at the other end of the optical line could be failing and require
replacement. Refer to the Physical Card Reseating, Resetting, and Replacement, on page 451 section.
DETAILED STEPS
Step 1 Ensure that the fiber connector for the card is completely plugged in. For more information about fiber connections and
card insertion, refer to the Turn Up a Node chapter in the Configuration guide.
Step 2 If the bit error rate (BER) threshold is correct and at the expected level, use an optical test set to measure the power level
of the line to ensure it is within guidelines. For specific procedures to use the test set equipment, consult the manufacturer.
Step 3 If the optical power level is good, verify that optical receive levels are within the acceptable range.
Step 4 If receive levels are good, clean the fibers at both ends according to site practice. If no site practice exists, complete the
fiber cleaning procedure in the Maintain the Node chapter in the Configuration guide.
Step 5 If the condition does not clear, verify that single-mode fiber is used.
Step 6 If the fiber is of the correct type, verify that a single-mode laser is used at the far-end node.
Step 7 Clean the fiber connectors at both ends for a signal degrade according to site practice.
Step 8 Verify that a single-mode laser is used at the far end.
Step 9 If the problem does not clear, the transmitter at the other end of the optical line could be failing and require replacement.
Refer to the Physical Card Reseating, Resetting, and Replacement, on page 451 section.
If the alarm does not get cleared, you need to report a Service-Affecting (SA) problem. Log into the Technical Support
Website at http://www.cisco.com/c/en/us/support/index.html for more information or log into http://www.cisco.com/c/
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
269
Alarm Troubleshooting
Clear the LOM Alarm

Cisco NCS 2000 series Specifications

General

Brand	Cisco
Model	NCS 2000 series
Category	Network Hardware
Language	English