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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
Note If the alarm inconsistency persists, 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.
Step 2 In card view, click Circuits and retrieve the node, card, and port information for the alarmed channel
from the Source field of the OCHNC circuit. Then follow the procedures of Step 3 (32MUX-O, 32WSS,
or AD-xC-xx.x card) or Step 4 (TXP, MXP, or line card) as appropriate.
Step 3 Verify the correct behavior of the far-end DWDM card (32MUX-O, 32WSS, or AD-xC-xx.x) that
manages the channel (wavelength):
a. Verify that the power value coming in on 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 as that in the VOA Power Ref field. If not, take the
appropriate corrective actions according to the alarm raised at the RX-ADD port.
Step 4 Verify the correct behavior of the TXP, MXP, or line card that is the signal source of the channel
(wavelength) that is alarmed:
a. The TX laser must be active (trunk port is in IS [Unlocked] state).
b. The wavelength provisioned must be the proper one.
c. 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.
Step 5 If the cards referenced in Step 3 and Step 4 are operating properly, go to Step 6. If not, take the
appropriate corrective actions according to the alarm raised on the card.
Step 6 If the alarmed card is a 32MUX-O, go to Step 9.
Step 7 If the alarmed card is a 32WSS, continue with the following steps:
a. Double-click the card.
b. 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).
c. Identify the correct row based in the Type field (the row must indicate Passthrough in the type field).
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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