Community Forum

"Dynamic Range Window violation"

Highlighted
Frequent Visitor

"Dynamic Range Window violation"

"RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=a4:98:13:fb:29:61;CMTS-MAC=28:52:61:29:69:61;CM-QOS=1.1;CM-VER=3.1;"

 

I have an Arris SB8200 modem with an XR500 Nighthawk and Comcast Gig package.

 

What does this error mean in the event log and how do I fix it?

 

From the research, I learned that maybe Arris upstream default is too high for Comcast recommended levels? or Comcast messed up their compatibility with Arris? Please help me out thanks.

deefbae7c6145e97488a9416430e8fb4.png
b53eb1b3d1897cf20d32232bcdf424ec.png
af222f9af6474d2810df5e27b8cfdf2b.png
Highlighted
Expert

Re: "Dynamic Range Window violation"

Bottom line. Are you actually experiencing any connectivity problems ? If not, don't sweat the log entries.



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
Highlighted
Frequent Visitor

Re: "Dynamic Range Window violation"

Yeah, I don't really get my speeds usually half most of the time and sometimes reboots. I looked this problem up in other threads and wanted more insight. Almost all threads say there is a problem somewhere hence why it's saying it.

Highlighted
Expert

Re: "Dynamic Range Window violation"

Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
Highlighted
Official Employee

Re: "Dynamic Range Window violation"

Greetings, @deox! I appreciate you taking the time to reach out to us here on the forums. I hope you are having an amazing day! I apologize to hear of the issues you are running into with your internet. I know how important a reliable connection is these days. I would like to take a deeper dive into the signal and see what could be going on. Can you please send me a PM with your first and last name so I may further assist you?

 

To send a private message, please click my name "ComcastMichael" then select "Send a Message" on the right side.


I am an Official Comcast Employee.
Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!