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Cisco Bug: CSCvs92746 - CBR8: dynamic modulation for R-PHY will bring CM in partial state or create un-recoverable errors

Last Modified

May 12, 2020

Products (1)

  • Cisco Remote PHY Shelves

Known Affected Releases

7.5

Description (partial)

Symptom:
When a modulation change takes place on one or more US channels, the CM connected to the affected US may go in partial state on Upstream or start showing a high number of un-recoverable errors.
The down US may or may not be the channel were a modulation change took place and also multiple channels may be affected.
One or more US may be affected but not possible to predict which ones. 

The modulation change can be triggered by the dynamic modulation configured on the Upstream or via a test command.

Conditions:
Dynamic modulation enabled and a modulation change is enforced for CM connected to an R-PHY
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