Cisco NCS 2000 series Troubleshooting Manual page 135

General Troubleshooting
i) If the LOS-P alarm has not cleared, continue with
Step 8
To unambiguously pinpoint the root cause of the alarm, verify the proper cabling of the EXP_RX port (which is the
common input port for all the pass-through channels) on the 32WSS or 4-WSS-C card:
a) The EXP_RX port of the alarmed 32WSS card must be connected to the EXP_TX port of the coupled WSS card
on the opposite side of the node.
b) Pull out the LC connector from the EXP_RX port of the WSS card and clean the fiber according to site practice.
c) Pull out the LC connector from the EXP_TX port of the coupled WSS card and clean that connector also.
d) Verify that the fiber attenuation is within the specifications (maximum tolerance is 1 dB).
e) If necessary, replace any bad fibers.
Note
Note
f) If the alarm condition persists even after the checking and fixing the fibers, replace the 32WSS card (refer to the
Upgrade, Add, and Remove Cards and Nodes chapter of the Configuration Guide). Before replacing the card, log
into the Technical Support Website at http://www.cisco.com/techsupport for more information or call Cisco TAC
(1 800 553-2447) in order to report a service-affecting problem).
Warning
Step 9 Verify the correct behavior of the VOA inside the 32MUX-O or 40MUX card:
a) Double-click the 32MUX-O or 40MUX card.
b) Click Circuits.
c) Delete the OCHNC circuit for the faulty channel.
d) Ensure that the service state of the corresponding ADD-RX port changes to IS-AINS (or
Unlocked,automaticInService) and that 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 of the VOA Attenuation Ref field, but with
the opposite sign (the algebraic sum of the two contributions must be equal to zero).
• Click the Apply button. If the LOS-P alarm persists, continue with this procedure. Otherwise, the problem
has been corrected.
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
Step 10
To unambiguously pinpoint the root cause of the alarm, verify the proper cabling of the alarmed ADD_RX port on the
32MUX-O or 40MUX card:
a) The ADD_RX port of the alarmed 32MUX-O or 40MUX must be connected to the DROP_TX port of the coupled
32DMX-O or 40DMX card on the opposite side of the node using two MPO-LC multifiber cables.
Before disconnecting any optical amplifier card fiber for troubleshooting, ensure that the optical amplifier
card is unplugged.
If no site practice exists for cleaning fibers, complete the procedure in the Maintain the Node chapter of
the Configuration Guide.
High-performance devices on this card can get hot during operation. To remove the card, hold it
by the faceplate and bottom edge. Allow the card to cool before touching any other part of it or
before placing it in an antistatic bag. Statement 201
Step 8, on page 89. Otherwise, the problem has been corrected.
Step 8, on page 89. Otherwise, the problem has been corrected.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
Condition B1 - LOS-P Alarm
89