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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
c. Click Alarms.
d. Verify that an Optical Power Degrade Low Loss of incoming Payload (OPWR-LDEG) alarm is
present on the CHAN-TX port.
e. Click the Synchronize button at the bottom left of the window.
f. If the alarm is correctly reported, move to Step 2. If not, close the CTC application, delete the CTC
cache, and open the CTC connection again.
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 Verify the correct behavior of the far-end DWDM card (32MUX-O, 32WSS, or 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 to 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 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 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, perform a manual measurement using a standard power meter.
e. If everything in Step 2 is correct, move to Step 3. If not, take the appropriate corrective actions
according to Chapter 2, “Alarm Troubleshooting.”
Step 3 Verify the proper cabling of the COM-RX port (the common input port for all of the drop channels) of
the alarmed 32DMX-O:
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, 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.
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