Corrective Actions For Scenario B (Optical Power Level Of Incoming Signal Lower Than Expected - Cisco NCS 2000 series Troubleshooting Manual

General Troubleshooting
Condition B2 Delta Power less than 6 dB (OPWR-LowDEGrade Alarm)
When the optical power is less than 6 dB lower than the expected value, even if a valid incoming signal is
present, the final VOA Power Reference setpoint value that is reported in the CTC is not reachable and the
VOA startup procedure is stopped at Phase 3.
The final conditions that CTC reports are:
• An 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 Power

Corrective Actions for Scenario B (Optical Power Level of Incoming Signal Lower than Expected)

When the optical power level of the incoming signal is lower than expected for the pass-through channels on
the WSS or the optical bypass channels on the 32MUX-O or 40MUX card, use the following procedures to
troubleshoot and eventually fix issues related to VOA start-up. According to the final conditions reported by
the card (either LOS-P alarm for condition B1 or OPWR-LowDEGrade for condition B2), two troubleshooting
procedures are suggested. These procedures are given in the following sections.
Condition B1 - LOS-P Alarm
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
DETAILED STEPS
Step 1
Verify the alarm validity:
a) Identify the DWDM nodes where the alarmed card is located.
b) Double-click the card (either the 32MUX-O, 40MUX, or WSS card).
c) Click Alarms.
d) Verify that a LOS-P alarm is present on the ADD-RX port.
e) Click the Synchronize button at the bottom left of the window.
field, but the value is (VOA Power Ref – 6 dBm) < Power < VOA Power Ref. To access this value, in
card view, click the Provisioning > Parameters tabs.
Verify the alarm validity:
Verify the correct behavior of the TXP, MXP, or line card that is the signal source of the channel
(wavelength) that is alarmed:
If the cards referenced in Step 3, on page 88
on page 88. If not, take the appropriate corrective actions according to the alarm raised on the card.
If the alarmed card is a 32MUX-O or 40MUX, go to
If the alarmed card is a 32WSS or 40MUX, continue with the following steps:
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:
Verify the correct behavior of the VOA inside the 32MUX-O or 40MUX card:
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:
Condition B2 Delta Power less than 6 dB (OPWR-LowDEGrade Alarm)
and Step 4, on page 88
Step 9, on page
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
are operating properly, go to
89.
Step 6,
87