Counter-Propagating Light Affecting Operation Of 32Dmx-C And 32Dmx-L Cards - Cisco NCS 2000 series Troubleshooting Manual

General Troubleshooting
Counter-PropagatingLightAffectingOperationof32DMX-Cand32DMX-LCards
Problem
be seriously affected by the counter-propagating light travelling from the drop ports of the card towards the
COM RX port. This counter-propagating light affects the internal VOA control loop of the vendor-specific
optical module of the 32DMX-C and 32DMX-L cards, leading to an increased optical path attenuation. This
is traffic affecting for all in-service channels.
Solution
is automatically upgraded to a newer version. The vendor ID of the new version of the card is 2051 and can
be viewed at CTC > Card View > Inventory tab. This new version of the optical module makes the VOA
control robust to counter-propagating light, thus, minimizing the effects of incorrect cabling during installation
and/or maintenance.
Solution
installed, the vendor-specific optical module on all these new cards is automatically upgraded to a newer
version at the Cisco Spare depots. Once the new card is installed in field, a downgrade of the optical module
will be prevented and the latest optical module version is preserved on the software package. If the 32DMX-C
or 32DMX-L card is already installed, complete the
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Corrective Action for Software Releases Lower than 9.0
SUMMARY STEPS
1. If the TXP card is preprovisioned in CTC, but not installed:
2. Install the TXP card into the receptacle at the back of the designated slot.
3. Wait for the TXP card to boot completely.
4. Verify that the Trunk-TX port of the TXP card is in OOS,DSBLD (ANSI) or Locked,disabled (ETSI)
state.
5. Wire the Trunk-TX/RX port of the TXP card to the fiber patch-panel.
6. Turn up the TXP card and display card view for the TXP card in CTC.
7. Click the Provisioning > Line tab and choose IS,AINS (ANSI) or Unlocked,automaticInService (ETSI)
from the Admin State drop-down list for the Trunk-TX port.
8. Display card view for the 32WSS card.
9. Click the Performance > Optical Chn tab and verify the Power ADD field on the CHAN-RX port of
the 32WSS card connected to the TXP card.
DETAILED STEPS
Step 1 If the TXP card is preprovisioned in CTC, but not installed:
a) Log into CTC.
b) Display card view for the TXP card.
c) Click the Provisioning > Line tab and choose OOS,DSBLD (ANSI) or Locked,disabled (ETSI) from the Admin
State drop-down list for the Trunk-TX port.
The in-service operation of the 32DMX-C and 32DMX-L cards (with vendor ID 2049 and 2050) can
Possible Cause The counter-propagating light can be inserted into the 32DMX-C or 32DMX-L card as a
result of incorrect cabling of transponder or line cards to the fiber patch-panel (in particular, swapping
RX with TX patchcords).
For software releases higher than or equal to 9.0, the vendor-specific optical module on all the cards
For software releases lower than 9.0, for new 32DMX-C and 32DMX-L cards that are not already
to manually fix the problem.

Counter-Propagating Light Affecting Operation of 32DMX-C and 32DMX-L Cards

Corrective Action for Software Releases Lower than 9.0,
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
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