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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
Step 2 Verify the correct behavior of the far-end DWDM card (32MUX-O, 32WSS, AD-xC-xx.x) that manages
the channel (wavelength), and the TXP, MXP, or line card that is the signal source of the channel
(wavelength) alarmed:
a. Click Circuits and retrieve the node, card, and port information for the alarmed channel from the
Source field of the OCHNC circuit.
b. For the far-end DWDM card, verify that the power value coming in the ADD_RX port is correct:
• In card view, click the Provisioning > Optical Chn: Optical Connector X > Parameters tabs.
Note X is number (1 to 4) of the proper multifiber MPO connector that manages the alarmed
channel (wavelength).
• The Power field value must be the same of VOA Power Ref field. If not, take the appropriate
corrective actions according to Chapter 2, “Alarm Troubleshooting.”
c. For the corresponding TXP, MXP, or line card connected, verify the following:
• The TX laser is active (the trunk port is in IS [Unlocked] state).
• The wavelength provisioned is the proper one.
d. The output power value must be within the expected range (refer to the “Hardware Specifications”
appendix in the Cisco ONS 15454 DWDM Reference Manual). If the trunk port PM is not available
through CTC (for example, TXP_MR_2.5G), perform a manual measurement using a standard
power meter.
e. If everything in Step 2 is correct, go to Step 3. If not, take the appropriate corrective actions
according to Chapter 2, “Alarm Troubleshooting.”
Step 3 Verify the correct behavior of the VOA inside the 32DMX-O card:
a. Double-click the 32DMX-O card.
b. Click Circuits.
c. Delete the OCHNC circuit for the faulty channel.
d. Ensure that the service state of the corresponding CHAN-TX port changes to IS-AINS (or
Unlocked,automaticInService) and the color changes to grey (LOS-P alarm should clear).
e. Click the Provisioning > Optical Chn: Optical Connector X > Parameters tabs and identify the
proper channel (wavelength).
Note X is number (1 to 4) of the proper multifiber MPO connector that manages the alarmed
channel (wavelength).
f. 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 in the VOA Attenuation Ref
field, but with the opposite sign (the algebraic sum of the two contributions must be equal to
zero).
• Click Apply.
g. Click Circuits.
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