New Poster
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2 Messages
Intermittent Internet Issues
Hi,
I have had this issue for 8 or so weeks now.
Basically the internet goes down for about 10 minutes from about once a day to once every few hours. It then comes back on its own without me doing anything.
I use my own router and my owm modem.
TP-Link TC7650 DOCSIS 3.0 (24x8) High Speed Cable Modem
TP-Link AC1750 Smart WiFi Router
This issue shows up in the modem logs.
Time Priority Description
| Sat Oct 10 13:08:12 2020 | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
| Sat Oct 10 13:08:06 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 13:07:56 2020 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c4... |
| Sat Oct 10 13:03:36 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 13:02:37 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 13:02:37 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 13:02:37 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 12:08:40 2020 | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
| Sat Oct 10 12:08:32 2020 | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM-QOS=1.0;CM-VER=3.0; |
| Sat Oct 10 12:08:20 2020 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c4... |
| Sat Oct 10 12:04:00 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 12:03:51 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 12:03:51 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 12:03:51 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 11:54:31 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 11:54:31 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 11:54:31 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 11:54:30 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 11:54:30 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 11:54:30 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 11:54:29 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 11:54:29 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 11:54:29 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 11:44:40 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 4;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 11:44:40 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 11:44:40 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 10:59:40 2020 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;CM... |
| Sat Oct 10 10:59:40 2020 | Critical (3) | Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;C... |
| Sat Oct 10 10:59:40 2020 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=c4:71:54:18:38:02;CMTS-MAC=00:01:5c:6d:1c:51;... |
| Sat Oct 10 10:13:38 2020 | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
EG
Expert
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111.6K Messages
5 years ago
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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111.6K Messages
5 years ago
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) 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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awst
New Poster
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2 Messages
5 years ago
Channel Status Modulation Channel ID Frequency Power SNR
Channel Status Channel Type Channel ID Symbol Rate Frequency Power
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CCChe
Official Employee
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6.9K Messages
5 years ago
Hi @awst! Thanks for using the Xfinity Forum. I'd be more than happy to take a deeper look at your intermittent issues and help find a resolution. Please send me a private message with your full name as it's listed on your billing statement. To send a private message, click on my name ComcastChe, then click Send a message.
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