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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
Figure 1-35 Optical Power Less than 6 dB Lower than Expected
Corrective Actions for Scenario B (Optical Power Level of Incoming Signal Lower than Expected)
When the optical power level of the incoming signal is lower than expected for the pass-through channels
on the 32WSS or the optical bypass channels on the 32MUX-O card, use the following procedures to
troubleshoot and eventually fix issues related to VOA start-up. According to the final conditions reported
by the card (either LOS-P alarm for condition B1 or OPWR-LowDEGrade for condition B2), two
troubleshooting procedures are suggested. These procedures are given in the following sections.
Condition B1—LOS-P Alarm
Step 1 Verify the alarm validity:
a. Identify the DWDM nodes where the alarmed card is located.
b. Double-click the card (either the 32MUX-O or the 32WSS card).
c. Click Alarms.
d. Verify that a LOS-P alarm is present on the ADD-RX 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.
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