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Connectivity / T3 / T4 Errors / High Uncorrectables

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Frequent Visitor

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:

 

TimePriorityDescription
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out
Aug 05 2020 12:58:45Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Aug 05 2020 19:20:12Critical (3)No Ranging Response received - T3 time-out
Aug 06 2020 17:59:34Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Aug 09 2020 03:39:16Critical (3)No Ranging Response received - T3 time-out
Aug 13 2020 10:34:40Critical (3)Ranging Request Retries exhausted
Aug 13 2020 10:34:40Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 13 2020 10:35:04Critical (3)No Ranging Response received - T3 time-out
Aug 13 2020 17:55:48Critical (3)Ranging Request Retries exhausted
Aug 13 2020 17:55:48Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 13 2020 18:15:53Critical (3)No Ranging Response received - T3 time-out
Aug 13 2020 18:16:37Critical (3)Ranging Request Retries exhausted
Aug 13 2020 18:16:37Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 13 2020 18:16:48Critical (3)No Ranging Response received - T3 time-out
Aug 13 2020 18:17:32Critical (3)Ranging Request Retries exhausted
Aug 13 2020 18:17:32Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 13 2020 18:17:49Critical (3)No Ranging Response received - T3 time-out
Aug 14 2020 09:19:06Critical (3)Ranging Request Retries exhausted
Aug 14 2020 09:19:06Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 14 2020 09:56:10Critical (3)No Ranging Response received - T3 time-out
signal1.png
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Highlighted
Frequent Visitor

Re: Connectivity / T3 / T4 Errors / High Uncorrectables

And it's getting worse... the modem log from just the last couple of hours:

 

TimePriorityDescription
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:34:30Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:40:55Critical (3)Ranging Request Retries exhausted
Aug 15 2020 04:40:55Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 04:41:19Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:47:43Critical (3)Ranging Request Retries exhausted
Aug 15 2020 04:47:43Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 04:48:07Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 04:54:31Critical (3)Ranging Request Retries exhausted
Aug 15 2020 04:54:31Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 04:54:56Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:01:20Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:01:20Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:01:44Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:08:07Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:08:07Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:08:31Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:14:55Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:14:55Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:15:19Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:21:44Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:21:44Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:22:08Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:28:32Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:28:32Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:28:56Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:35:20Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:35:20Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:35:44Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:42:09Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:42:09Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:42:33Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:48:57Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:48:57Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:49:21Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 05:55:45Critical (3)Ranging Request Retries exhausted
Aug 15 2020 05:55:45Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 05:56:09Critical (3)No Ranging Response received - T3 time-out
Aug 15 2020 06:02:33Critical (3)Ranging Request Retries exhausted
Aug 15 2020 06:02:34Critical (3)Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 15 2020 06:02:58Critical (3)No Ranging Response received - T3 time-out

 

Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA415120 Ksym/sec17300000 Hz38.8 dBmV
2LockedATDMA425120 Ksym/sec23700000 Hz38.5 dBmV
3LockedATDMA435120 Ksym/sec30300000 Hz39.0 dBmV
4LockedATDMA445120 Ksym/sec36700000 Hz39.3 dBmV
5Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV

 

And these Uncorrectables are since the modem was restarted less than 24 hours ago:

ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUnCorrectables
1LockedQAM 25612447000000 Hz6.8 dBmV40.3 dB14247139
2LockedQAM 25613453000000 Hz6.5 dBmV40.3 dB22279656
3LockedQAM 25614459000000 Hz6.4 dBmV38.9 dB10339374
4LockedQAM 25615465000000 Hz6.1 dBmV38.9 dB15108762
5LockedQAM 25616471000000 Hz6.3 dBmV40.3 dB165510117
6LockedQAM 25617477000000 Hz6.0 dBmV40.3 dB11578068
7LockedQAM 25618483000000 Hz6.1 dBmV40.3 dB150810188
8LockedQAM 25619489000000 Hz6.0 dBmV38.6 dB15456922
9LockedQAM 25620495000000 Hz6.0 dBmV40.9 dB16238036
10LockedQAM 25621507000000 Hz6.4 dBmV40.3 dB10707479
11LockedQAM 25622513000000 Hz7.0 dBmV38.9 dB7876406
12LockedQAM 25623519000000 Hz7.0 dBmV40.3 dB10778290
13LockedQAM 25624525000000 Hz6.4 dBmV38.9 dB133410118
14LockedQAM 25625531000000 Hz6.0 dBmV38.9 dB20137418
15LockedQAM 25626537000000 Hz5.8 dBmV40.3 dB10158540
16LockedQAM 25627543000000 Hz5.5 dBmV38.6 dB18189255
17LockedQAM 25628549000000 Hz5.3 dBmV38.9 dB12716110
18LockedQAM 25629555000000 Hz5.5 dBmV38.9 dB21707359
19LockedQAM 25630561000000 Hz5.6 dBmV38.9 dB10458492
20LockedQAM 25631567000000 Hz6.0 dBmV38.9 dB126310519
21LockedQAM 25632573000000 Hz6.6 dBmV38.9 dB16997476
22LockedQAM 25633579000000 Hz6.9 dBmV38.9 dB11514880
23LockedQAM 25634585000000 Hz7.5 dBmV40.3 dB14308943
24LockedQAM 25635591000000 Hz7.5 dBmV38.6 dB13287752
25LockedQAM 25636597000000 Hz7.4 dBmV39.5 dB2665230
26LockedQAM 25637603000000 Hz6.5 dBmV39.2 dB1804655
27LockedQAM 25638609000000 Hz6.1 dBmV39.5 dB1853953
28LockedQAM 25639615000000 Hz5.9 dBmV39.2 dB2215894
29LockedQAM 25640621000000 Hz5.3 dBmV39.2 dB2063975
30LockedQAM 25641627000000 Hz5.3 dBmV39.2 dB2045698
31LockedQAM 25642633000000 Hz5.0 dBmV38.6 dB2525310
32LockedQAM 25643639000000 Hz5.1 dBmV38.9 dB252

5816

Highlighted
Expert

Re: Connectivity / T3 / T4 Errors / High Uncorrectables

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 !



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
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Highlighted
Official Employee

Re: Connectivity / T3 / T4 Errors / High Uncorrectables

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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Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!