Condition C2—Delta Power less than 6 dB Lower than Expected
If the delta power is less than 6 dB lower than expected, the final conditions reported in CTC are the same as
those reported for Condition B2 (see the Condition B2—Delta Power less than 6 dB (OPWR-LowDEGrade
Alarm), on page 87):
• Αn OPWR-LowDEGrade (OCH layer) alarm is present on the port associated with the VOA.
• A valid optical power value (different from the end of scale value of –50 dBm) can be read in the CTC
Power field, but the value is (VOA Power Ref – 6 dBm) < Power < VOA Power Ref. To view this value
in card view, click the Provisioning > Parameters tabs.
A dirty connection or excessive loss of the incoming span are among the possible reasons that can lead to a
fault condition. They are the most common and affect all wavelengths, whereas an excessive amplifier gain
tilt or a wavelength misconfiguration on the far-end TXP or MXP card can lead to condition where only a
single wavelength fails.
Corrective Action for Scenario C (Optical Power Level of Incoming Signal Lower than Expected)
Scenario C1 - LOS-P Alarm
SUMMARY STEPS
1. Verify the alarm validity:
2.
3. Verify the correct behavior of the VOA inside the 32DMX-O or 40DMX card:
4. To unambiguously pinpoint the root cause of the alarm, verify the proper cabling of the COM-RX port
(common input port for all the drop channels) of the alarmed 32DMX-O or 40DMX card:
DETAILED STEPS
Step 1 Verify the alarm validity:
a) Identify the DWDM nodes where the alarmed card is located.
b) Double-click the 32DMX-O or 40DMX card.
c) Click Alarms.
d) Verify that a LOS-P 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 Scenario C1 - LOS-P Alarm, on page 93. If not, close the CTC application,
delete the CTC cache, and open the CTC connection again.
If the alarm inconsistency persists, log into the Technical Support Website at
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC (1 800
553-2447) in order to report a service-affecting problem.
Note
Step 2 Click Circuits and retrieve the node, card, and port information for the alarmed channel from the Source field of the
OCHNC circuit.
a)
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.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
93
General Troubleshooting
Condition C2—Delta Power less than 6 dB Lower than Expected
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