Contributor
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44 Messages
Error logs.
All, any help on these modem log errors?
Date Time |
Event ID |
Event Level |
Description |
10/25/2021 09:21 |
82000500 |
3 |
“Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;” |
10/25/2021 09:15 |
2436694061 |
5 |
“Dynamic Range Window violation” |
10/25/2021 09:15 |
82001200 |
5 |
“RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;” |
10/25/2021 09:15 |
2436694061 |
5 |
“Dynamic Range Window violation” |
10/25/2021 09:15 |
82001200 |
5 |
“RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;” |
10/25/2021 09:15 |
2436694061 |
5 |
“Dynamic Range Window violation” |
10/25/2021 09:15 |
82001200 |
5 |
“RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;” |
10/25/2021 09:15 |
2436694061 |
5 |
“Dynamic Range Window violation” |
10/25/2021 09:15 |
82001200 |
5 |
"RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS- |
EG
Expert
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107.6K Messages
3 years ago
First. Are you actually experiencing any connectivity problems or are you just focusing on those error log entries ?
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user_cd429e
Contributor
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44 Messages
3 years ago
@EG, I hope this finds you well!
Yes I am experiencing connectivity issues with high latency spikes. The modem log events of Dynamic Range Window Violation, RNG-RSP CCAP commanded power in excess of 6 dB Below the value corresponding to the top of the draw, and T3 time outs usually occur at the same time as the latency spikes. I use PingPlotter to monitor the latency. The high latency is 100% latency (packet loss) lasting several milliseconds for each spike and lasting across as long as 1 minute across the entire graph (see examples below). The modem events, from what I have read are most likely caused by noise on the lines to my home. Since my post at the beginning of this thread I have been in contact with the local manager of service (Andre) who is going to have the lines and connections checked. He is also monitoring connections and event logs in my neighborhood.
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
Here is what I posted at the beginning of this thread.
I posted 6 months ago with the title of "numerous uncorrectables". At that time and still now there are daily latency issues with my xfinity connection. The modem files still show numerous uncorrectables and errors.
Arris SB8200 Modem.
When latency occurs I run a program called Ping Plotter and can see the very high latency on its graph.
As you will see in the logs below there are continuous errors indicating a Dynamic Range Window Violation and Power in excess of 6db below something called "top of the draw". These errors have been continuous as long as I can remember even after Comcast came out and checked my lines and installed a single splitter in my outside box (which did correct the Upstream Bonded Channel db power.
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EG
Expert
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107.6K Messages
3 years ago
O/k. Please also post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.
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EG
Expert
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107.6K Messages
3 years ago
O/k. 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) / an upstream channel-return path impairment 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 !
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EG
Expert
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107.6K Messages
3 years ago
Looks good ! A router on the LAN side of a modem can not cause those RF signal errors on the WAN connection to the Comcast system.
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