LOS (Loss of signal)
The corrective actions for the loss of signal condition are dependent upon the AID where
the condition is raised. The procedure addresses each of these. Perform the procedure
“Path Power Trace” (p. 3-8) to determine on which of the port types the LOS has
occurred.
• T
ransponder port LOS - go to procedure “Transponder Port Loss of Signal” (p. 2-157)
Severity Critical
Service affecting? Yes
Applicability 112SCX10, 112SX10L, 11DPE12E, 11QPA4, 11STAR1,
11STMM10, 11STGE12, 43SCX4, 43STX4, 4DPA4, MVAC,
SVAC
Transponder Port Loss of Signal
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.
At the end of each step wait to see if the fault clears. If not, continue with the next step.
...................................................................................................................................................................................................
1
Query the optical receive power on the port where the LOS condition is present.
CLI show interface
<shelf slot port>
WEBUI From the Equipment Tree, select the card, and select the desired port.
...................................................................................................................................................................................................
2
If... Then...
the power is below the minimum threshold, the problem is upstream from that port.
Continue with Step 3.
the
power is within acceptable limits, the problem is with the card itself. Proceed to
Step 5.
Trouble-clearing procedures
LOS
LOS (Loss of signal)
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
2-157
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