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Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.13.2 VOA Failure Scenarios
If the TX laser is active, the wavelength is provisioned properly, and the output power value is in the
correct range, go to Step 6. Otherwise, take the appropriate corrective action, including card replacement
if the output power value is outside of the expected range (refer to the “Add and Remove Cards and
Nodes” chapter of the Cisco ONS 15454 DWDM Procedure Guide. Replacing the card should correct the
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
Step 6 If the TXP or MXP card behaves as expected, check the fiber connection between the two cards:
a. The ADD_RX port of the alarmed 32MUX-O must be connected to the TRUNK_TX port of a TXP
or MXP card using an MPO-LC multifiber cable.
Note A patch-panel tray is normally used to manage fiber connections (for patch-panel cabling
details, refer to the “Turn Up a Node” chapter in the Cisco ONS 15454 DWDM Procedure
Guide).
b. Check and clean the LC fiber fan-out according to site practice. The fiber numbers (1 to 8) must
correspond to the wavelength managed.
c. If a patch panel is used, check and, if necessary, clean the LC-LC adapter.
d. If necessary, replace any bad devices (maximum tolerance is 1 dB).
e. Pull out the LC connector from the TRUNK_TX port of the TXP or MXP card and clean the fiber
according to site practice.
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, move to Step 7. Otherwise, the problem has been corrected.
Step 7 Verify the correct behavior of the VOA inside the 32MUX-O card:
a. Double-click the 32MUX-O card.
b. Click Circuits.
• Delete the OCHNC circuit relating to the faulty channel.
• Ensure that the service state of the corresponding ADD-RX port changes to IS-AINS (or
Unlocked,automaticInService), and that the color turns grey (the LOS-P alarm should clear).
c. In card view, click the Provisioning > Optical Chn: Optical Connector X > Parameters tabs and
identify the proper channel (wavelength).
d. Decrease the attenuation on the VOA to the minimum (0 dB) to enable channel startup. To perform
this in field adjustment:
• Read the VOA Attenuation Ref value for the channel (wavelength).
• Enter the same value into the VOA Attenuation Calib field as that of the VOA Attenuation Ref
field, but with the opposite sign (the algebraic sum of the two contributions must be equal to
zero).
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