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|Affected Product ID
||Traffic down on SMR2 if TXP power enter on AD Tx port in case of wrong fiber conn.|
A limited number of SMR2 line cards, listed in the Products Affected section, might observe a possible traffic hit if light is injected into the DROP-TX port of the 40-SMR2-C line cards.
The 40-SMR2-C line cards might observe a traffic drop if the Transmit (TX) port of a trunk is connected accidentally to a TX port of the multiplexer/demultiplexer (MUX/DMX) patch panel. This causes the Single Module ROADM (SMR) drop variable optical attenuator (VOA) control loop to be affected by back-travelling light.
The observation is that these affected 40-SMR2-C line cards might lead to traffic down on services/channels already provisioned when a new service is created. The error message from the Cisco Transport Controller is shown in this example.
Some customers might observe a traffic drop symptom in the SMR2 line cards listed in the Products Affected section. Complete these steps in order to recover from this symptom. There is no need to request a replacement card.
- Identify the installed channel which led the traffic to be affected.
- Turn off the trunk laser of the identified channel in step 1.
- Check the cabling connection and verify that the TX trunk port has not been accidentally connected to the channel TX port of the MUX/DMX patch panel.
- If the cabling is incorrect, connect the TX of the channel trunk to the RX of the MUX/DMX and turn back the channel trunk in service.
Traffic should be restored once these steps are complete.
For more information, see the Cisco ONS 15454 DWDM Network Configuration Guide.
Check the serial numbers with the Serial Number Validation Tool and follow the steps in the Workaround/Solution section if you observe a traffic drop.
For More Information
If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:
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