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.
X
is number (1 to 45) of the proper multifiber MPO connector that manages the alarmed channel
(wavelength).
Note
• The Power field value must be the same of VOA Power Ref field. If not, take the appropriate corrective actions
according to
Alarm Troubleshooting, on page 99
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 Configuration guide). If the trunk port PM
is not available through CTC, perform a manual measurement using a standard power meter.
e) If everything in
Scenario C2 - OPWR-LowDEGrade Alarm, on page 95
is correct, move to
OPWR-LowDEGrade Alarm, on page 95
. If not, take the appropriate corrective actions according to
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 or 40DMX:
a) Verify that the COM_RX port of the alarmed 32DMX-O or 40DMX is connected either to the DROP_TX port of a
32WSS or 40WSS-C card or to the COM_TX port of an OPT-PRE, OPT-BST/OPT-AMP-C/OPT-AMP-17-C, or
OSC-CSM, depending on the actual node layout.
b) Pull out the LC connector from the COM_RX port of the 32DMX-O or 40DMX 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.
Invisible laser radiation could be emitted from the end of the unterminated fiber cable or connector.
Do not stare into the beam directly with optical instruments. Viewing the laser output with certain
optical instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of 100
mm could pose an eye hazard.
Statement 1056
Warning
Before disconnecting any optical amplifier card fiber for troubleshooting, ensure that the optical amplifier
card is unplugged.
Note
If no site practice exists for cleaning fibers, complete the procedure in the Maintain the Node chapter in
the Configuration guide.
Note
f)
If the alarm condition persists even after the cabling has been checked and fixed, the root cause could be related to
a network issue and a more accurate analysis of the signal flow is needed according to the actual system topology.
If necessary, call Cisco TAC (1 800 553-2447) in order to report a service-affecting problem.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
96
General Troubleshooting
Scenario C2 - OPWR-LowDEGrade Alarm
