1-103
Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.13.2 VOA Failure Scenarios
h. Recreate the OCHNC circuit and verify that Circuit Status field reports DISCOVERED and the state
is IS (Unlocked).
i. If the LOS-P alarm has not cleared, continue with Step 4. If it has cleared, you are finished.
Step 4 To unambiguously pinpoint the root cause of the alarm, verify the proper cabling of the COM-RX port
(common input port for all the drop channels) of the alarmed 32DMX-O card:
a. Verify that the COM_RX port of the alarmed 32DMX-O is connected either to the DROP_TX port
of a 32WSS card or to the COM_TX port of an OPT-PRE, OPT-BST, or OSC-CSM card, depending
on the actual node layout.
b. Pull out the LC connector from the COM_RX port of the 32DMX-O card and clean the fiber
according to site practice.
c. Pull out the LC connector from the COM_TX or DROP_TX port of the connected DWDM card and
clean the fiber according to site practice.
d. Verify that the fiber attenuation is within the specifications (maximum tolerance is 1 dB).
e. If necessary, replace any bad fibers.
Warning
Invisible laser radiation may be emitted from the end of the unterminated fiber cable or connector. Do
not view directly with optical instruments. Viewing the laser output with certain optical instruments
(for example, eye loupes, magnifiers, and microscopes) within a distance of 100 mm may pose an eye
hazard.
Statement 1056
Note Before disconnecting any optical amplifier card fiber for troubleshooting, ensure that the
optical amplifier card is unplugged.
Note If no site practice exists for cleaning fibers, complete the procedure in the “Maintain the
Node” chapter of the Cisco ONS 15454 DWDM Procedure Guide.
f. If the alarm condition persists even after the cabling has been checked and fixed, replace the
32DMX-O card (refer to the “Add and Remove Cards and Nodes” chapter of the Cisco ONS 15454
DWDM Procedure Guide. Before replacing the card, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447) in
order to report a service-affecting problem).
Warning
High-performance devices on this card can get hot during operation. To remove the card, hold it by
the faceplate and bottom edge. Allow the card to cool before touching any other part of it or before
placing it in an antistatic bag.
Statement 201
Scenario C2 - OPWR-LowDEGrade Alarm
Step 1 Verify the alarm validity:
a. Identify the DWDM nodes where the alarmed card is seated.
b. Double-click the 32DMX-O card.
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