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 A2325A, AHPHG, AHPLG, ALPHG, AM2017B, AM2125A,
AM2125B, AM2325A, AM2325B
Corrective Action
This procedure details the corrective action for a LOS against the DCM 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 LOS condition is present.
CLI show interface
<shelf slot port>
WEBUI From the Equipment Tree, select the card, and select the desired port.
...................................................................................................................................................................................................
2
Verify that the fiber is the correct type (multi-mode/single mode) and that the other end of
the fiber is connected properly.
...................................................................................................................................................................................................
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.
...................................................................................................................................................................................................
4
If... Then...
no active traffic is present on the system remove the fiber from the port where the LOS
is raised and measure the optical power.
the optical power is more than 15 dB below
the level coming out of the amplifier DCM
port
using the standard optical fiber jumper
cleaning procedure, clean the fiber, and
measure the power again.
the optical power is within the required limits clean the receive connector on the card. If the
LOS condition is still present, the problem
may be with the card.
Trouble-clearing procedures
LOSDCM
LOSDCM (From DCM 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
2-163
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