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T3 Timeouts Every Few Minutes

das126
New Poster

T3 Timeouts Every Few Minutes

I decided to read a bit about cable modem diagnostics today (just for fun!), and it looks like my event logs are filled with the following every few minutes.


15 07/06/20 21:07:09 R05.0 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=68:b6:fc:2e:c0:c9;CMTS-MAC=00:01:5c:70:84:54;CM-QOS=1.1;CM-VER=3.0;
16 07/06/20 21:07:33 R03.0 critical Ranging Request Retries exhausted;CM-MAC=68:b6:fc:2e:c0:c9;CMTS-MAC=00:01:5c:70:84:54;CM-QOS=1.1;CM-VER=3.0;
17 07/06/20 21:07:33 R06.0 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=68:b6:fc:2e:c0:c9;CMTS-MAC=00:01:5c:70:84:54;CM-QOS=1.1;CM-VER=3.0;
18 07/06/20 21:07:33 R03.0 critical Ranging Request Retries exhausted;CM-MAC=68:b6:fc:2e:c0:c9;CMTS-MAC=00:01:5c:70:84:54;CM-QOS=1.1;CM-VER=3.0;
19 07/06/20 21:07:33 R06.0 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=68:b6:fc:2e:c0:c9;CMTS-MAC=00:01:5c:70:84:54;CM-QOS=1.1;CM-VER=3.0;
20 07/06/20 21:09:09 R05.0 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=68:b6:fc:2e:c0:c9;CMTS-MAC=00:01:5c:70:84:54;CM-QOS=1.1;CM-VER=3.0;

 

Additionally, I'm noticing the following:

- Downstream power is between -12 and -14 dBmV (too low)

- Downstream SNR always seems to have one channel in the 27-28 range, a few channels in the low 30s and only one value 35+

- Upstream signal strength is 51 dBmV (too high)

 

Honestly, I'm not experiencing any connectivity issues that I know of, but I am curious as to what is going on and whether any of this is cause for concern. I have internet only (no TV, no voice) without splitters and am using an older, unsupported DOCSIS 3.0 modem (I know, I know). Is the modem the issue?

BruceW
Gold Problem Solver

Re: T3 Timeouts Every Few Minutes

Please see Internet Troubleshooting Tips. Signal problems are often due to poor coax connections or damaged coax cable, usually in or near your home.

EG
Expert

Re: T3 Timeouts Every Few Minutes

You have a bad connection. I'm surprised that you are even online !!



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