Cisco ONS 15454 DWDM Manual page 88

1.13.2 VOA Failure Scenarios
If the alarmed card is a 32WSS, verify the incoming power level from the connected TXP, MXP, or line
Step 2
card. If the alarmed card is a 32MUX-O, go to
a. Double-click the 32WSS card.
Click the Provisioning > Optical Chn: Optical Connector X > Parameters tabs to display the
b.
optical power physically coming into the 32WSS ADD-RX port.
Note
Identify the proper channel (wavelength) and read the Power ADD field.
c.
d. If the Power ADD value is less than –4.5 dBm, go to
Optical Chn: Optical Connector X > Parameters tabs.
Note
Identify the correct row based on the Type field (the row must indicate Add in the type field).
e.
Decrease the attenuation on the VOA to the minimum (0 dB) to enable channel startup. To perform
f.
this adjustment:
•
•
•
In card view, click Circuits.
g.
Delete the OCHNC circuit that relates to the faulty channel.
h.
Ensure that the corresponding ADD-RX service state port changes to IS-AINS (or
i.
Unlocked,automaticInService) and that the color changes to grey (the LOS-P alarm should clear).
Recreate the OCHNC circuit and verify that the Status field reports DISCOVERED and that the state
j.
is IS (Unlocked).
If the LOS-P alarm has not cleared, replace the 32WSS card (refer to the "Add and Remove Cards
k.
and Nodes" chapter of the Cisco ONS 15454 DWDM Procedure Guide). Before you replace 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 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 3 Because the actual power received by the 32WSS card is lower than expected, verify the correct behavior
of the TXP, MXP, or line card connected to the 32WSS:
• The TX laser must be active (trunk port is in IS [or Unlocked] state).
• The wavelength provisioned must be the proper one.
Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
1-88
X is the number (1 to 4) of the appropriate multifiber MPO connector that manages the
alarmed channel (wavelength).
X is the number (1 to 4) of the appropriate multifiber MPO connector that manages the
alarmed channel (wavelength).
Read the VOA Attenuation Ref value for the channel (wavelength).
Enter into the VOA Attenuation Calib field the same value 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 Apply. If the LOS-P alarm persists, continue with this procedure. Otherwise, the problem
has been corrected.
Step 5.
Step 3. If not, click the Provisioning >
Chapter 1 General Troubleshooting
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