Visitor
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8 Messages
T3/T4 timeouts and tons of uncorrectable errors
I have been having issues with Xfinity service for a while now and it is progressively getting worse. I had a tech out in September/October timeframe last year and he removed an amp telling me that was the issue, but have seen zero improvement. In fact it is worse and from what I notice especially when it is raining or snowing. I know the modem is not the issue or my router which is also new and experienced the same problems on my last 2 sets of routers/modems, but recently it is much worse.
I am getting tons of uncorrectable errors along with tons of T3/T4 timeouts, which the T4 timeouts are disruptive as the modem connection is resetting. Also when getting many T3 timeouts I see degradation of speed and packet loss. Just to reiterate I have a brand new modem and router as well as testing the cable I have from the drop to my modem. That test shows no shorts etc. There are no splitters/amps. Overall not really happy and now that I am working from home this is becoming especially frustrating when the internet disconnects 10+ times a day.
I also many times can see my Upstream status go to poor from the modem. I have also seen 4 out of the 5 upstream bonded channels go to Unknown, as well as having Downstream bonded channels become Not Locked.
Upstream Status: Poor
Partial Service: Poor
Cable modem is in partial service mode. Your service provider might be under maintenance. Most of the time it won't affect your traffic and will automatically clear when work is complete.
Upstream Power Level: Good
Here are the event logs (after I reset modem) and power/SNR before the reset.
Time Priority Description
Fri Mar 24 09:47:44 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Fri Mar 24 09:35:27 2023 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Fri Mar 24 09:35:21 2023 (Notice (6)) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Fri Mar 24 09:35:15 2023 (Notice (6)) TLV-11 - unrecognized OID;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Time Not Established (Notice (6)) Honoring MDD; IP provisioning mode = IPv6
Time Not Established (Critical (3)) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Fri Mar 24 09:10:39 2023 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 23:58:33 2023 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 23:56:09 2023 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:35:34 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:35:19 2023 Warning (5) MDD message timeout;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:34:25 2023 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:07:27 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:07:05 2023 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:06:57 2023 Warning (5) MDD message timeout;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 22:04:35 2023 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:50:47 2023 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 14 15 16 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:50:27 2023 Warning (5) MDD message timeout;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:49:19 2023 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:46:17 2023 Warning (5) TCS Partial Service;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:35:02 2023 (Critical (3)) No Ranging Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:35:01 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:35:01 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 21:28:40 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 20:45:31 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 20:40:20 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 19:58:01 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 19:08:12 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 18:45:42 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 18:09:07 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 18:05:47 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 16:31:25 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 15:50:28 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 14:30:09 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 10:22:05 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 10:21:44 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 09:55:21 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 09:49:17 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 09:45:44 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 09:40:11 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Thu Mar 23 09:38:40 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 18:39:09 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 18:37:54 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 17:45:41 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 17:33:18 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 17:30:03 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 17:23:35 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 17:03:18 2023 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 17:02:41 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 16:47:12 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 16:41:49 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 16:14:05 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 16:12:23 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Wed Mar 22 15:29:21 2023 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[[mac_cleared]];CMTS-MAC=[[mac_cleared]];CM-QOS=1.1;CM-VER=3.1;
Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 12 495000000 Hz 2.6 41.6 20503440 37632958
2 Locked QAM256 1 423000000 Hz 4.1 41.9 12587053 17015643
3 Locked QAM256 2 435000000 Hz 4.1 42 14005345 20058872
4 Locked QAM256 3 441000000 Hz 4 42 14673142 21668820
5 Locked QAM256 4 447000000 Hz 3.9 42 15382722 23362188
6 Locked QAM256 5 453000000 Hz 3.8 41.9 16056171 25169715
7 Locked QAM256 6 459000000 Hz 3.5 41.9 16845156 27103804
8 Locked QAM256 7 465000000 Hz 3.4 41.9 17619969 29346118
9 Locked QAM256 8 471000000 Hz 3.4 41.9 18609525 32165257
10 Locked QAM256 9 477000000 Hz 3.3 41.9 19288189 34086690
11 Locked QAM256 10 483000000 Hz 3.1 41.8 19531431 34814774
12 Locked QAM256 11 489000000 Hz 2.8 41.7 19968170 35999369
13 Locked QAM256 13 501000000 Hz 2.4 41.6 21144450 39492283
14 Locked QAM256 14 507000000 Hz 2.1 41.4 21821147 41361301
15 Locked QAM256 15 513000000 Hz 2.1 41.5 22316637 43150952
16 Locked QAM256 16 519000000 Hz 2.1 41.4 22897409 44963466
17 Locked QAM256 17 525000000 Hz 2.3 41.4 23345743 46545478
18 Locked QAM256 18 531000000 Hz 2.3 41.4 23941345 48469724
19 Locked QAM256 19 537000000 Hz 2.3 41.3 24457716 50182931
20 Locked QAM256 20 543000000 Hz 2.2 41.2 24972778 51903086
21 Locked QAM256 21 555000000 Hz 1.3 40.9 26170763 55683482
22 Locked QAM256 22 561000000 Hz 0.7 40.5 26926469 57827026
23 Locked QAM256 23 567000000 Hz 0.6 40.4 27515432 59560264
24 Locked QAM256 24 573000000 Hz 0.5 40.4 27806678 60899986
25 Locked QAM256 25 579000000 Hz 0.7 40.5 28024663 62115403
26 Locked QAM256 26 585000000 Hz 1.1 40.7 28235843 63362442
27 Locked QAM256 27 591000000 Hz 1.3 40.8 28454265 64530970
28 Locked QAM256 28 597000000 Hz 1.2 40.8 28812206 66015544
29 Locked QAM256 29 603000000 Hz 1.2 40.8 29120969 67344660
30 Locked QAM256 30 609000000 Hz 0.8 40.8 29413839 68511477
31 Locked QAM256 31 615000000 Hz 1.1 40.9 29549079 69450019
32 Locked QAM256 32 621000000 Hz 1.1 40.9 29801260 70502885
Upstream Bonded Channels
Channel LockedStatus ChannelType ChannelID SymbolRate Frequency Power
1 Locked ATDMA 5 2560 Ksym/sec 40400000 Hz 40.3 dBmV
2 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 39.3 dBmV
3 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 40.0 dBmV
4 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 40.5 dBmV
5 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 40.0 dBmV
6 Not Locked Unknown 0 0 0 0.0
7 Not Locked Unknown 0 0 0 0.0
8 Not Locked Unknown 0 0 0 0.0
Downstream OFDM Channels
Channel LockedStatus ProfileID ChannelID Frequency Power SNR/MER ActiveSubcarrier Unerror Correctable Uncorrectable
1 Locked 0 ,1 ,2 ,3 193 702000000 Hz 2.88 dBmV 39.4 dB 1108 ~ 2987 6043745406 3543152326 9617
2 Not Locked 0 0 0 Hz 0 dBmV 0 dB 0 ~ 4095 0 0 0
Upstream OFDMA Channels
Channel LockedStatus ProfileID ChannelID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
BruceW
Gold Problem Solver
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26.3K Messages
2 years ago
Intermittent network connection problems are often due to poor coax connections or damaged coax cable, usually in or near your home. Running the cable through a surge protector, a defective splitter, or too many splitters can cause signal problems as well. If there is an amplifier in the line make sure it's getting power. RF noise, or problems further upstream are also possible.
If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you can't find the problem or you'd rather have Comcast take care of it and an employee does not respond to your message here, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. It's not likely they can fix the problem remotely. If not, insist they send a tech out to identify the cause and correct it.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit ($70-$100) unless you have their Service Protection Plan ( https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device or anything outside your home you shouldn't be charged.
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.
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cortneyyyrc
Visitor
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8 Messages
2 years ago
As I said there are no splitters or amps. The cable was checked along with connections.
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BruceW
Gold Problem Solver
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26.3K Messages
2 years ago
If it was tested with a continuity checker, it could still have problems carrying RF. Even if checked with more sophisticated equipment it could still be intermittent, as the symptoms appear to be intermittent. And interference and problems upstream are still possible. Suggest you have Comcast check it out again.
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.
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