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thisisfine87
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Tuesday, July 29th, 2025

Internet issues: T3/T4 Timeouts and a lot of Uncorrectables

Hello,

We've been having slow connectivity and dropout issues with our internet the past 2 weeks and am not sure the best path forward. The following are snapshots of our NetGear CM2000 modem status and error logs since a reboot Sunday (July 27) morning. From the status and logs, there numerous channels with a ton of uncorrectables while the error logs show a bunch of T3 and T4 (and other) errors. I went through the Xfinity assistant in the app July 18, and it "found an issue with the signal to your home" and "your internet service has been degraded within the last week". It then setup a tech appointment for July 20th - the tech came out and replaced the outdoor 3-way coax splitter with 2 2-way splitters stating that the 3-way splitter was the issue. He claimed the issue is "fixed." Since that appointment, we haven't seen an improvement in the internet and still are seeing the errors highlighted below with degraded internet performance. As of this AM, the Xfinity assistant still states there "an issue with the signal to your home" and it can schedule a tech to come out. But honestly, the tech that came out was less than helpful so I'm reaching out here for help and perhaps a different path forward for resolving the issue. I can't tell if this a problem with the upstream connection (Xfinity) or a coax cable going bad - nothing has changed with my internet setup since this has started happening. Thanks for any help anyone can provide!

Modem Status:

Procedure Status Comment
Acquire Downstream Channel 375000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD IPv6 only
 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 4 375000000 Hz -3.1 dBmV 39.2 dB 47810289 15972011
2 Locked QAM256 1 357000000 Hz -2.8 dBmV 40.8 dB 13218778 3558743
3 Locked QAM256 2 363000000 Hz -3.1 dBmV 38.1 dB 67866608 130766796
4 Locked QAM256 3 369000000 Hz -3.4 dBmV 39.2 dB 73327970 145518349
5 Locked QAM256 5 381000000 Hz -3.2 dBmV 39.4 dB 38143060 14475421
6 Locked QAM256 6 387000000 Hz -3.0 dBmV 37.9 dB 48741455 124248222
7 Locked QAM256 7 393000000 Hz -3.0 dBmV 40.7 dB 35691719 15442018
8 Locked QAM256 8 399000000 Hz -3.0 dBmV 42.0 dB 31671603 16930209
9 Locked QAM256 9 405000000 Hz -3.2 dBmV 40.7 dB 48097726 125488793
10 Locked QAM256 10 411000000 Hz -3.6 dBmV 40.0 dB 36262956 57504898
11 Locked QAM256 11 417000000 Hz -3.4 dBmV 43.0 dB 0 0
12 Locked QAM256 12 423000000 Hz -3.2 dBmV 43.1 dB 0 0
13 Locked QAM256 13 429000000 Hz -3.5 dBmV 42.8 dB 0 0
14 Locked QAM256 14 435000000 Hz -3.8 dBmV 42.7 dB 0 0
15 Locked QAM256 15 441000000 Hz -3.7 dBmV 42.8 dB 20 0
16 Locked QAM256 16 447000000 Hz -3.4 dBmV 43.0 dB 4 0
17 Locked QAM256 17 453000000 Hz -3.1 dBmV 43.2 dB 3 0
18 Locked QAM256 18 459000000 Hz -2.9 dBmV 43.2 dB 1 0
19 Locked QAM256 19 465000000 Hz -2.9 dBmV 43.2 dB 12 0
20 Locked QAM256 20 471000000 Hz -2.6 dBmV 43.3 dB 17 0
21 Locked QAM256 21 477000000 Hz -3.0 dBmV 43.3 dB 10 0
22 Locked QAM256 22 483000000 Hz -3.1 dBmV 43.2 dB 2 0
23 Locked QAM256 23 489000000 Hz -3.2 dBmV 43.0 dB 2 0
24 Locked QAM256 24 495000000 Hz -3.2 dBmV 43.0 dB 0 0
25 Locked QAM256 25 501000000 Hz -3.3 dBmV 42.9 dB 0 0
26 Locked QAM256 26 507000000 Hz -3.3 dBmV 43.0 dB 0 0
27 Locked QAM256 27 513000000 Hz -3.2 dBmV 43.0 dB 0 0
28 Locked QAM256 28 519000000 Hz -3.5 dBmV 42.9 dB 0 0
29 Locked QAM256 29 525000000 Hz -3.7 dBmV 42.7 dB 0 0
30 Locked QAM256 30 531000000 Hz -3.6 dBmV 42.7 dB 0 0
31 Locked QAM256 31 537000000 Hz -3.6 dBmV 42.8 dB 0 0
32 Locked QAM256 32 543000000 Hz -3.4 dBmV 43.1 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 3 5120 Ksym/sec 29200000 Hz 47.8 dBmV
2 Locked ATDMA 2 5120 Ksym/sec 22800000 Hz 46.3 dBmV
3 Locked ATDMA 1 5120 Ksym/sec 16400000 Hz 44.3 dBmV
4 Locked ATDMA 4 5120 Ksym/sec 35600000 Hz 47.8 dBmV
5 Not Locked Unknown 0 0 0 0.0 dBmV
6 Not Locked Unknown 0 0 0 0.0 dBmV
7 Not Locked Unknown 0 0 0 0.0 dBmV
8 Not Locked Unknown 0 0 0 0.0 dBmV
 
Downstream OFDM Channels
Channel Lock Status Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier
Number Range		 Unerrored
Codewords		 Correctable
Codewords		 Uncorrectable
Codewords
1 Locked 0 ,1 ,2 ,3 193 690000000 Hz -2.32 dBmV 41.7 dB 148 ~ 3947 2561863334 2297310388 0
2 Locked 0 ,1 ,2 ,3 194 957000000 Hz -1.42 dBmV 42.5 dB 148 ~ 3947 2586576471 2004014878 365
 
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV

Error log:

Time Priority Description
Tue Jul 29 09:50:19 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 09:12:15 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 08:40:12 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 07:33:06 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 07:32:35 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 06:12:10 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 6 9 10; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 06:11:45 2025 (Warning (5)) MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 06:11:43 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 06:11:35 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 05:47:14 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 05:37:47 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 02:45:56 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 6 9 10; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 02:45:47 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 02:45:30 2025 (Warning (5)) MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 02:45:30 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 01:12:02 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Tue Jul 29 01:01:39 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 23:43:16 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 23:39:12 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 22:49:35 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 22:45:14 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 22:36:47 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 6 9 10; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 22:36:25 2025 (Warning (5)) MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 21:59:12 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 20:50:59 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 6 9 10; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 20:50:32 2025 (Warning (5)) MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 20:46:45 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 20:32:59 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 6 9 10; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 20:32:44 2025 (Warning (5)) MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 20:27:19 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 17:25:48 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 17:22:42 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 17:04:19 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 17:03:02 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 16:46:35 2025 (Critical (3)) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 16:45:19 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 16:40:38 2025 (Critical (3)) UCD invalid or channel unusable;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 16:30:04 2025 (Critical (3)) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 15:10:56 2025 (Notice (6)) CM-STATUS message sent. Event Type Code: 4; Chan ID: 2 3 6 9 10; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Mon Jul 28 15:10:25 2025 (Warning (5)) MDD message timeout;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Question

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Updated 

19 hours ago

 • Edited

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XfinityFrank

Official Employee

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1.5K Messages

6 days ago

Hello, @thisisfine87. We have your direct message and will continue to assist you privately. Please be reminded that sending unsolicited Direct Messages to an Official Employee of the Xfinity Community Forum, is a violation of Forum Guidelines. In the future we ask that you please find the most appropriate public board for your question type and post it there. If needed, we may invite you to send us a Direct Message. Thanks.

0

EG

Expert

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112.3K Messages

6 days ago

@thisisfine87 @XfinityFrank 

Please circle back here and post any possible solutions for the issue here in these open public forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.

1

0

XfinityJustinC

Official Employee

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1.5K Messages

@thisisfine87 I appreciated your time working with me here over Xfinity Forums, I'm glad the technician was able to help get the the T3/T4 issues corrected and your network signal improved. We're available here over Xfinity Forums as well as Reddit for employee support 7 days a week between 6am - 1am ET, have a good day. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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19 hours ago

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