Cisco NCS 2000 series Troubleshooting Manual page 140

Scenario C1 - LOS-P Alarm
Note
• The Power field value must be the same of VOA Power Ref field. If not, take the appropriate corrective actions
according to
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 (for example, TXP_MR_2.5G), perform a manual measurement using a standard power
meter.
e) If everything in
If not, take the appropriate corrective actions according to
Step 3
Verify the correct behavior of the VOA inside the 32DMX-O or 40DMX card:
a) Double-click the 32DMX-O or 40DMX card.
b) Click Circuits.
c) Delete the OCHNC circuit for the faulty channel.
d) Ensure that the service state of the corresponding CHAN-TX port changes to IS-AINS (or
Unlocked,automaticInService) and the color changes to grey (LOS-P alarm should clear).
e) Click the Provisioning > Optical Chn > Parameters tabs and identify the proper channel (wavelength).
f) Decrease the attenuation on the VOA to the minimum (0 dB) to enable channel startup. To perform this in field
adjustment:
• Read the VOA Attenuation Ref value for the channel (wavelength).
• Enter the same value into the VOA Attenuation Calib field as that in the VOA Attenuation Ref field, but with
the opposite sign (the algebraic sum of the two contributions must be equal to zero).
• Click Apply.
g) Click Circuits.
h) Recreate the OCHNC circuit and verify that Circuit Status field reports DISCOVERED and the state is IS (Unlocked).
i) If the LOS-P alarm has not cleared, continue with
finished.
Step 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:
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 card, 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.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
94
X is number (1 to 45) of the proper multifiber MPO connector that manages the alarmed channel
(wavelength).
Alarm Troubleshooting, on page 99
Scenario C1 - LOS-P Alarm, on page 93 is correct, go to Scenario C1 - LOS-P Alarm, on page
Alarm Troubleshooting, on page 99
Scenario C1 - LOS-P Alarm, on page
General Troubleshooting
93.
93. If it has cleared, you are