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Ranging Request Retries exhausted
our connection is intermittently slow or the signal is weak on the radio. Event log on the modem is scrolling with this:
| 08:21:24 Sun Apr 17 2022 |
Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel | |||
| 08:21:34 Sun Apr 17 2022 |
Critical (3) | No Ranging Response received - T3 time-out;; | |||
| 08:21:34 Sun Apr 17 2022 |
Critical (3) | Ranging Request Retries exhausted; |
could this indicate a problem with the drop? or a config issue on the modem
Accepted Solution
EG
Expert
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110.4K Messages
3 years ago
The error log entries indicate 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 will be able to poll the CMTS (Cable Modem Termination System) to check 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
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110.4K Messages
3 years ago
If this a with a WiFi connection, for a test, does a computer / device that is hardwired directly to the router / gateway device with an ethernet cable have the same problem ?
With this test, we are trying to isolate this down to being either a WiFi-only problem or a problem with the general connection to the Comcast system which would of course affect both. It's a good first step of troubleshooting before proceeding any further.
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EG
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110.4K Messages
3 years ago
Please redact all of the CM MAC and the CMTS MAC addresses in your error log entries for your privacy. They are considered to be personal information. Personally identifiable information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically. It flagged your post as "Private".
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EG
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110.4K Messages
3 years ago
I was talking about the slowness problem as WiFi / LAN problems can not cause those error log messages. Only the WAN connection to the Comcast system can. That said. Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
(edited)
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EG
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110.4K Messages
3 years ago
@user_e567b7
FWIW. You have an upstream channel / return path impairment of some sort / connection quality problem. There is an 11 dB difference in the signal power between some of the channels. There should be no more than a 3 dB or so difference. You may want to get a tech out to investigate and correct this. Good luck with it !
(edited)
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