This may be caused by the following reasons:
• Damaged or dirty fiber connected to the far-end receiver
• Received power may not be within the acceptable range on OT port input
• Damaged or dirty transmitter inside pluggable module on the OT
• Problem at the upstream OT
Severity Major
Service affecting? Yes
Applicability 112SA1L, 112SCX10, 112SX10L, 11DPE12, 11DPE12E,
11QPA4, 11STAR1, 11STMM10, 11STGE12, 43SCX4, 43STA1P,
43STX4, 43STX4P, 4DPA4
Corrective Action
NOTICE
Service-disruption hazard
A cold reset, reseat, or replacement of a card is service impacting if the card is currently
carrying services. To determine if any services are currently carried over a card, perform
the procedure “Reseating a Card” (p. 3-19).
If
there are services currently carried over the card, it may be best to wait for a
maintenance window before resetting, replacing, or reseating the card.
This procedure details the corrective action for clearing the LOM declared on an OT port.
At the end of each step wait to see if the fault clears. If not, continue with the next step.
...................................................................................................................................................................................................
1
Query the receive power on the port where the LOM condition is present.
CLI show interface
<shelf slot port>
WEBUI From the Equipment Tree, select the card, and select the desired port.
If the power is below a minimum threshold, the problem may be upstream from that port.
Visually inspect the OT port connection. Ensure that there are no loose fibers. If so,
connect the fiber properly.
...................................................................................................................................................................................................
2
Check the immediate upstream OT for any alarm conditions. If there are any, clear the
failures.
Trouble-clearing procedures
LOM
LOM (Loss of Multiframe - OTU)
....................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................
1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
2-147
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