LD Input LOS
The LINE port on one of the amplifier cards has detected a Loss Of Signal. The LOS
alarm is raised if the power measured at the port input drops below a threshold.
This may be caused by the following reasons:
• A misconnected, damaged or dirty fiber
• The received power may not be within the acceptable range
Severity Critical
Service affecting? Yes
Applicability AHPLG, AHPHG, ALPHG, ALPFGT, A2325A, AM2017B,
AM2125A, AM2125B, AM2325B, OSCT
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.
At the end of each step wait to see if the fault clears. If not, continue with the next step.
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1
Query the 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.
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2
Verify that the fiber is the correct type (multi-mode / single mode) and that the other end
of the fiber is connected properly.
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3
Ensure that the administrative state of the port is Admin Up. If it is Up, then toggle the
administrative state from UP-->DOWN-->UP.
Trouble-clearing procedures
LOS
LD Input LOS
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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
2-153
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