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Re: Consecutive T3 timeouts while trying to range on upstream channel
I have no solution, but confirming that for the last 2 months I see those messages and the connection drops are getting to me now.
Called Xfinity a few times; they said they fixed something in my area; called again - they sent a tech over; the tech checked something outside the house, said everything looks good.
Connection keeps dropping.
Xfinity, what should we do?!?!?
Accepted Solution
EG
Expert
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110K Messages
5 years ago
The upstream power is a bit on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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EG
Expert
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110K Messages
5 years ago
What do the modem's signal stats look like ?
Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.
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flying_tanks
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4 Messages
5 years ago
Here's just the last 2 days worth of logs:
Wed May 06 09:09:07 2020 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Wed May 06 09:09:07 2020 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Wed May 06 09:09:07 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Wed May 06 09:01:54 2020 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Wed May 06 09:01:54 2020 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Wed May 06 09:01:54 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6
Time Not Established Notice (6) WiFi Interface [wl0] set to Channel 1 (Side-Band Channel:N/A) - Reason:INIT
Tue May 05 10:37:51 2020 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 10:33:31 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 10:32:34 2020 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 10:32:34 2020 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 10:32:33 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 09:47:55 2020 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 09:47:55 2020 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 09:47:54 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 09:47:49 2020 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 09:47:49 2020 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 09:47:49 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Tue May 05 07:41:55 2020 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=5c:b0:**:**:**:**;CMTS-MAC=00:01:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Critical (3) No Ranging Response received - T3 time-out
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flying_tanks
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4 Messages
5 years ago
Sorry, should have posted it as well. Here it is:
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EG
Expert
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110K Messages
5 years ago
Good luck with it !
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flying_tanks
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4 Messages
5 years ago
Thanks a lot for the response!
I removed a splitter that I didn't even need, and I see the numbers have improved
Will see if 43 range will work better than the prevous range of 48
Thanks a lot for your help!!! I wish Xfinity support had mentioned it
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