I am a returning Comcast customer and decided to "upgrade" my cable modem by purchasing the Motorola MB8611. However, ever since my service has been activated I'm seeing the modem reboot several times per day. The errors that I see in the log for the modem are a lot of entries like the below:
No Ranging Response received - T3 time-out
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
Honoring MDD; IP provisioning mode = IPv6
DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3
Based on my research in this forum the best info I can gather is that:
1. This issue is possibly related to upstream and/or downstream power being too high
2. Other modems seem to not be affected by this issue, while the MB8611 seems to be uniquely problematic and tends to restart
3. There has been no real fix identified or rolled out by Comcast/Xfinity
Here's the connection info as of now for my modem:
| Downstream Bonded Channels |
 |
|
|
|
| Channel |
Lock Status |
Modulation |
Channel ID |
Freq. (MHz) |
Pwr (dBmV) |
SNR (dB) |
Corrected |
Uncorrected |
| 1 |
Locked |
QAM256 |
13 |
507.0 |
-1.2 |
41.4 |
0 |
0 |
| 2 |
Locked |
QAM256 |
10 |
483.0 |
-1.4 |
41.4 |
0 |
0 |
| 3 |
Locked |
QAM256 |
11 |
489.0 |
-1.3 |
41.5 |
0 |
0 |
| 4 |
Locked |
QAM256 |
12 |
495.0 |
-1.2 |
41.4 |
0 |
0 |
| 5 |
Locked |
QAM256 |
14 |
513.0 |
-1.3 |
41.2 |
0 |
0 |
| 6 |
Locked |
QAM256 |
15 |
519.0 |
-1.2 |
41.1 |
0 |
0 |
| 7 |
Locked |
QAM256 |
16 |
525.0 |
-1.2 |
41.7 |
0 |
0 |
| 8 |
Locked |
QAM256 |
17 |
531.0 |
-1.1 |
41.7 |
0 |
0 |
| 9 |
Locked |
QAM256 |
18 |
537.0 |
-1.2 |
41.5 |
0 |
0 |
| 10 |
Locked |
QAM256 |
19 |
543.0 |
-1.0 |
41.7 |
0 |
0 |
| 11 |
Locked |
QAM256 |
20 |
549.0 |
-1.0 |
41.8 |
0 |
0 |
| 12 |
Locked |
QAM256 |
21 |
555.0 |
-0.9 |
41.6 |
0 |
0 |
| 13 |
Locked |
QAM256 |
22 |
561.0 |
-0.9 |
41.7 |
0 |
0 |
| 14 |
Locked |
QAM256 |
23 |
567.0 |
-0.8 |
41.7 |
0 |
0 |
| 15 |
Locked |
QAM256 |
24 |
573.0 |
-0.8 |
41.7 |
0 |
0 |
| 16 |
Locked |
QAM256 |
25 |
579.0 |
-0.8 |
41.7 |
0 |
0 |
| 17 |
Locked |
QAM256 |
26 |
585.0 |
-0.6 |
41.7 |
0 |
0 |
| 18 |
Locked |
QAM256 |
27 |
591.0 |
-0.6 |
41.8 |
0 |
0 |
| 19 |
Locked |
QAM256 |
28 |
597.0 |
-0.6 |
41.8 |
0 |
0 |
| 20 |
Locked |
QAM256 |
29 |
603.0 |
-0.7 |
41.6 |
0 |
0 |
| 21 |
Locked |
QAM256 |
30 |
609.0 |
-0.6 |
41.8 |
0 |
0 |
| 22 |
Locked |
QAM256 |
31 |
615.0 |
-0.7 |
41.8 |
0 |
0 |
| 23 |
Locked |
QAM256 |
32 |
621.0 |
-0.8 |
41.6 |
0 |
0 |
| 24 |
Locked |
QAM256 |
33 |
627.0 |
-0.9 |
41.8 |
0 |
0 |
| 25 |
Locked |
QAM256 |
34 |
633.0 |
-0.9 |
41.7 |
0 |
0 |
| 26 |
Locked |
QAM256 |
35 |
639.0 |
-1.0 |
41.7 |
0 |
0 |
| 27 |
Locked |
QAM256 |
36 |
645.0 |
-0.9 |
41.8 |
0 |
0 |
| 28 |
Locked |
QAM256 |
37 |
651.0 |
-0.8 |
41.9 |
0 |
0 |
| 29 |
Locked |
QAM256 |
38 |
657.0 |
-0.9 |
42.0 |
0 |
0 |
| 30 |
Locked |
QAM256 |
39 |
663.0 |
-0.7 |
42.1 |
0 |
0 |
| 31 |
Locked |
QAM256 |
40 |
669.0 |
-0.6 |
42.2 |
0 |
0 |
| 32 |
Locked |
OFDM PLC |
41 |
690.0 |
0.5 |
42.3 |
38154539 |
0 |
|
| Upstream Bonded Channels |
|
|
|
|
| Channel |
Lock Status |
Channel Type |
Channel ID |
Symb. Rate (Ksym/sec) |
Freq. (MHz) |
Pwr (dBmV) |
| 1 |
Locked |
SC-QAM |
1 |
5120 |
35.6 |
46.3 |
| 2 |
Locked |
SC-QAM |
2 |
5120 |
29.2 |
46.0 |
| 3 |
Locked |
SC-QAM |
3 |
5120 |
22.8 |
45.5 |
| 4 |
Locked |
SC-QAM |
4 |
5120 |
16.4 |
45.3 |
| 5 |
Locked |
SC-QAM |
9 |
1280 |
39.6 |
46.5 |
|
@EG I have seen that you have assisted with issues like this in the past and I was wondering if you've ever seen one successfully resolved. If so, could you please point me in the right direction?
Thanks for your help.
XfinityRyanE
Official Employee
•
1.1K Messages
1 year ago
Hello @chief_rocka,
I'm sorry to hear that you are having trouble with your services. As someone that uses the internet for just about everything, I know how important it is to have a stable connection and our team is here to help! To get started, please use the chat icon in the upper right to enter Direct Messaging and send us a message with your full name and full address.
Here are the detailed steps to direct message us:
• Click "Sign In" if necessary
• Click the "direct messaging" icon (upper right corner of this page)
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
• Type your message in the text area near the bottom of the window
• Press Enter to send your message
Please let me know if you have any questions or run into any problems.
0
0