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
•
Α
n 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
