I have been experiencing network interruptions for the past few days. This set of equipment has been working fine for a year with no issues. However, starting a few days ago, I started experiencing frequent network disruptions, occurring approximately every two or three hours. The logs indicate T3 or T4 timeouts. I have checked my modem, and it seems to be functioning properly based on the data. I haven't connected any splitters or similar devices. I have tried changing the cable and restarting the modem, but it hasn't resolved the issue. Since scheduling Xfinity's technical service requires payment, I want to confirm if this is indeed not an issue with my equipment. After some research, it seems that T4 timeout errors typically occur on the ISP side. I will attach my equipment status data and logs. Thank you.
| 2023-7-10, 15:34:19 |
Notice (6) |
Honoring MDD; IP provisioning mode = IPv6 |
| 2023-7-10, 15:34:00 |
Critical (3) |
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XXX;CMTS-MAC=XXX;CM-QOS=1.1;CM-VER=3.0; |
| 2023-7-10, 15:32:23 |
Critical (3) |
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=XXX;CMTS-MAC=XXX;CM-QOS=1.1;CM-VER=3.0; |
| 2023-7-10, 15:32:23 |
Warning (5) |
MDD message timeout;CM-MAC=XXX;CMTS-MAC=XXX;CM-QOS=1.1;CM-VER=3.0; |
| Startup Procedure |
| Procedure |
Status |
Comment |
| Acquire Downstream Channel |
531000000 Hz |
Locked |
| Connectivity State |
OK |
Operational |
| Boot State |
OK |
Operational |
| Security |
Enabled |
BPI+ |
| IP Provisioning Mode |
Honor MDD |
honorMdd(4) |
|
|
|
| Downstream Bonded Channels |
| Channel |
Lock Status |
Modulation |
Channel ID |
Frequency |
Power |
SNR |
Correctables |
Uncorrectables |
| 1 |
Locked |
QAM256 |
17 |
531000000 Hz |
3.4 dBmV |
39.9 dB |
0 |
0 |
| 2 |
Locked |
QAM256 |
21 |
555000000 Hz |
3.5 dBmV |
40.1 dB |
0 |
0 |
| 3 |
Locked |
QAM256 |
22 |
561000000 Hz |
3.7 dBmV |
39.9 dB |
0 |
0 |
| 4 |
Locked |
QAM256 |
23 |
567000000 Hz |
3.5 dBmV |
40.1 dB |
0 |
0 |
| 5 |
Locked |
QAM256 |
24 |
573000000 Hz |
3.7 dBmV |
40.2 dB |
0 |
0 |
| 6 |
Locked |
QAM256 |
1 |
435000000 Hz |
3.7 dBmV |
39.8 dB |
0 |
0 |
| 7 |
Locked |
QAM256 |
2 |
441000000 Hz |
3.6 dBmV |
39.9 dB |
0 |
0 |
| 8 |
Locked |
QAM256 |
3 |
447000000 Hz |
3.6 dBmV |
39.9 dB |
0 |
0 |
| 9 |
Locked |
QAM256 |
4 |
453000000 Hz |
3.6 dBmV |
39.9 dB |
0 |
0 |
| 10 |
Locked |
QAM256 |
5 |
459000000 Hz |
3.7 dBmV |
40 dB |
0 |
0 |
| 11 |
Locked |
QAM256 |
6 |
465000000 Hz |
3.5 dBmV |
40 dB |
0 |
0 |
| 12 |
Locked |
QAM256 |
7 |
471000000 Hz |
3.6 dBmV |
40.1 dB |
0 |
0 |
| 13 |
Locked |
QAM256 |
8 |
477000000 Hz |
3.7 dBmV |
40.2 dB |
0 |
0 |
| 14 |
Locked |
QAM256 |
9 |
483000000 Hz |
3.5 dBmV |
40.2 dB |
0 |
0 |
| 15 |
Locked |
QAM256 |
10 |
489000000 Hz |
3.6 dBmV |
40.2 dB |
0 |
0 |
| 16 |
Locked |
QAM256 |
11 |
495000000 Hz |
3.2 dBmV |
40 dB |
0 |
0 |
| 17 |
Locked |
QAM256 |
12 |
501000000 Hz |
2.7 dBmV |
39.9 dB |
0 |
0 |
| 18 |
Locked |
QAM256 |
13 |
507000000 Hz |
2.7 dBmV |
39.4 dB |
0 |
0 |
| 19 |
Locked |
QAM256 |
14 |
513000000 Hz |
2.6 dBmV |
39.5 dB |
0 |
0 |
| 20 |
Locked |
QAM256 |
15 |
519000000 Hz |
2.9 dBmV |
39.8 dB |
0 |
0 |
| 21 |
Locked |
QAM256 |
16 |
525000000 Hz |
2.5 dBmV |
39.4 dB |
0 |
0 |
| 22 |
Locked |
QAM256 |
18 |
537000000 Hz |
2.8 dBmV |
39.6 dB |
0 |
0 |
| 23 |
Locked |
QAM256 |
19 |
543000000 Hz |
2.9 dBmV |
39.9 dB |
0 |
0 |
| 24 |
Locked |
QAM256 |
20 |
549000000 Hz |
2.9 dBmV |
39.9 dB |
0 |
0 |
|
|
|
| Upstream Bonded Channels |
| Channel |
Lock Status |
US Channel Type |
Channel ID |
Symbol Rate |
Frequency |
Power |
| 1 |
Locked |
ATDMA |
5 |
5120 Ksym/sec |
35600000 Hz |
44.9 dBmV |
| 2 |
Locked |
ATDMA |
3 |
5120 Ksym/sec |
22800000 Hz |
44.9 dBmV |
| 3 |
Locked |
ATDMA |
4 |
5120 Ksym/sec |
29200000 Hz |
44.9 dBmV |
| 4 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0.0 dBmV |
| 5 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0.0 dBmV |
| 6 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0.0 dBmV |
| 7 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0.0 dBmV |
| 8 |
Not Locked |
Unknown |
0 |
0 Ksym/sec |
0 Hz |
0.0 dBmV |
|
XfinityMartyR
Official Employee
•
2K Messages
2 years ago
Hello @SwordSea! Thank you for reaching out to us over our Community Forums. If you are experiencing T3, and T4 timeouts there can be a few different causes. Ranging from a modem issue, to noise on the upstream/downstream signal power levels, or an impairment along the cable drop to your home. Generally, for T3 time-outs you want no more than a dozen. More than one T4 Time out is cause for concern. If you would like, we can take a look from our end to see what the signal levels are reading. Just send us a direct message.
To send a "Direct Message" message:
• Click "Sign In" if necessary
• Click the "Direct Message" icon
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window
• Press Enter to send it
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bajanjack
Visitor
•
20 Messages
2 years ago
I’ve been dealing with exactly the same problem- intermittent internet outages that last several minutes, several times a day. I sent my Motorola MB8611 modem logs to Motorola who confirmed T3 and T4 timeouts, and said it’s an Xfinity issue. I had new coax put in from the street to my house, and in my house as well. The Xfinity reps claimed there have been SRO’s and that one was scheduled yesterday. I even got a message on my app saying there’s a known network issue. End result of all this and countless calls?- same problem persists.
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EG
Expert
•
110K Messages
2 years ago
@bajanjack
Please create a new topic of your own here on this board detailing your issue. Thanks. For future reference, it is better to submit your own post as it creates a ticket to get help, and posting on an old thread can delay getting help.
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