Frequent Visitor
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5 Messages
Connectivity / T3 / T4 Errors / High Uncorrectables
One more of these... I'm getting intermittent problems with connectivity, T3 & T4 errors in the modem log and high uncorrectables noted in the cable modem signal data.
Inside wiring is very simple, incoming line to a single splitter to a cable modem and a TiVo box.
Obviously, this doesn't work well when there's a family of people trying to work and go to school remotely.
Troubleshooting steps?
Logs:
| Time | Priority | Description |
| Time Not Established | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 05 2020 12:58:45 | Warning (5) | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 |
| Aug 05 2020 19:20:12 | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 06 2020 17:59:34 | Warning (5) | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1 |
| Aug 09 2020 03:39:16 | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 13 2020 10:34:40 | Critical (3) | Ranging Request Retries exhausted |
| Aug 13 2020 10:34:40 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted |
| Aug 13 2020 10:35:04 | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 13 2020 17:55:48 | Critical (3) | Ranging Request Retries exhausted |
| Aug 13 2020 17:55:48 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted |
| Aug 13 2020 18:15:53 | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 13 2020 18:16:37 | Critical (3) | Ranging Request Retries exhausted |
| Aug 13 2020 18:16:37 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted |
| Aug 13 2020 18:16:48 | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 13 2020 18:17:32 | Critical (3) | Ranging Request Retries exhausted |
| Aug 13 2020 18:17:32 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted |
| Aug 13 2020 18:17:49 | Critical (3) | No Ranging Response received - T3 time-out |
| Aug 14 2020 09:19:06 | Critical (3) | Ranging Request Retries exhausted |
| Aug 14 2020 09:19:06 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted |
| Aug 14 2020 09:56:10 | Critical (3) | No Ranging Response received - T3 time-out |
marnold1974
Frequent Visitor
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5 Messages
4 years ago
And it's getting worse... the modem log from just the last couple of hours:
And these Uncorrectables are since the modem was restarted less than 24 hours ago:
5816
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EG
Expert
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103.5K Messages
4 years ago
The signal stats are o/k. And FWIW, many of those log entries have the exact same date / time stamp (Aug 15 2020 04:34:30), so that is actually one single event. It just looks worse / more numerous. Be advised that this is not to say that you are not actually having problems as the balance of the error log entries look troublesome !
So, even though the signal stats looked o/k at that snapshot in time, the balance of 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 !
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CCTambrey
Gold Problem Solver
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3.4K Messages
4 years ago
Hello, marnold1974! I appreciate you taking the time to reach out to us here on the forums for help with this issue. We always want to make sure our customers have a stable, consistent connection and I'd love to work with you to get you back to a better service experience. Please send me a private message with your first and last name, as well as your service address so I can assist.
To send a private message, click my name "ComcastTambrey", then click "send a message".
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