6 Messages
Intermittent connection failures
I have been having intermittent failures with my connection. I have troubleshooted by using the xfinity agent, restarted / reset the modem, etc. I have no splitters or amplifiers on the cable line. The modem is a SB8200. I logged into the admin console and I see a single downstream channel that has very lower power, compared to the rest, and hundreds of thousands of uncorrectables over the last 14 days (since I reset the modem last). I've added the tables below. Any ideas?
Downstream
Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
4 | Locked | QAM256 | 435000000 Hz | -0.3 dBmV | 43.5 dB | 1 | 0 |
1 | Locked | QAM256 | 417000000 Hz | -0.1 dBmV | 43.6 dB | 0 | 0 |
2 | Locked | QAM256 | 423000000 Hz | -0.2 dBmV | 43.6 dB | 4 | 0 |
3 | Locked | QAM256 | 429000000 Hz | -0.3 dBmV | 43.6 dB | 0 | 0 |
5 | Locked | QAM256 | 441000000 Hz | -0.5 dBmV | 43.4 dB | 1 | 0 |
6 | Locked | QAM256 | 447000000 Hz | -0.7 dBmV | 43.3 dB | 0 | 0 |
7 | Locked | QAM256 | 453000000 Hz | -0.7 dBmV | 43.3 dB | 0 | 0 |
8 | Locked | QAM256 | 459000000 Hz | -0.7 dBmV | 43.2 dB | 0 | 0 |
9 | Locked | QAM256 | 465000000 Hz | -0.6 dBmV | 43.1 dB | 11 | 0 |
10 | Locked | QAM256 | 471000000 Hz | -0.6 dBmV | 43.1 dB | 1 | 0 |
11 | Locked | QAM256 | 477000000 Hz | -0.5 dBmV | 43.1 dB | 0 | 0 |
12 | Locked | QAM256 | 483000000 Hz | -0.6 dBmV | 42.8 dB | 0 | 0 |
13 | Locked | QAM256 | 489000000 Hz | -0.7 dBmV | 42.9 dB | 1 | 0 |
14 | Locked | QAM256 | 495000000 Hz | -1.0 dBmV | 42.7 dB | 0 | 0 |
15 | Locked | QAM256 | 501000000 Hz | -1.3 dBmV | 42.6 dB | 0 | 0 |
16 | Locked | QAM256 | 507000000 Hz | -1.5 dBmV | 42.5 dB | 1 | 0 |
17 | Locked | QAM256 | 513000000 Hz | -1.7 dBmV | 42.4 dB | 0 | 0 |
18 | Locked | QAM256 | 519000000 Hz | -1.8 dBmV | 42.3 dB | 12 | 0 |
19 | Locked | QAM256 | 525000000 Hz | -1.6 dBmV | 42.2 dB | 18 | 0 |
20 | Locked | QAM256 | 531000000 Hz | -1.5 dBmV | 41.1 dB | 11 | 0 |
21 | Locked | QAM256 | 537000000 Hz | -1.5 dBmV | 42.1 dB | 0 | 0 |
22 | Locked | QAM256 | 543000000 Hz | -1.6 dBmV | 42.3 dB | 7 | 0 |
23 | Locked | QAM256 | 549000000 Hz | -1.7 dBmV | 42.3 dB | 11 | 0 |
24 | Locked | QAM256 | 555000000 Hz | -1.9 dBmV | 42.1 dB | 16 | 0 |
25 | Locked | QAM256 | 561000000 Hz | -2.1 dBmV | 42.0 dB | 17 | 0 |
26 | Locked | QAM256 | 567000000 Hz | -2.3 dBmV | 41.6 dB | 11 | 0 |
27 | Locked | QAM256 | 573000000 Hz | -2.5 dBmV | 41.8 dB | 9 | 0 |
28 | Locked | QAM256 | 579000000 Hz | -2.6 dBmV | 41.7 dB | 14 | 0 |
29 | Locked | QAM256 | 585000000 Hz | -2.8 dBmV | 41.6 dB | 10 | 0 |
30 | Locked | QAM256 | 591000000 Hz | -2.9 dBmV | 41.6 dB | 1 | 0 |
31 | Locked | QAM256 | 597000000 Hz | -2.9 dBmV | 41.6 dB | 1 | 0 |
32 | Locked | QAM256 | 603000000 Hz | -2.9 dBmV | 41.6 dB | 12 | 0 |
193 | Locked | Other | 957000000 Hz | -16.4 dBmV | 27.8 dB | 74869046 | 295722069 |
Upstream
Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
1 | 1 | Locked | SC-QAM Upstream | 16400000 Hz | 6400000 Hz | 41.0 dBmV |
2 | 2 | Locked | SC-QAM Upstream | 22800000 Hz | 6400000 Hz | 42.0 dBmV |
3 | 3 | Locked | SC-QAM Upstream | 29200000 Hz | 6400000 Hz | 42.0 dBmV |
4 | 4 | Locked | SC-QAM Upstream | 35600000 Hz | 6400000 Hz | 42.0 dBmV |
user_noname
Contributor
•
168 Messages
10 months ago
@dishawbr - Yes, your Channel ID 193 is out of specs., and depends how comfortable you are troubleshooting, you could start with the steps in this Post or another webpage if you wish.
1
0
rocky1158
Visitor
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2 Messages
10 months ago
I am having the same problem. I've tried 2 different Gateways and 2 different runs of coax with no change. I had one Xfinity technician visit and he installed a splitter to get my signal strength down to a acceptable level. I asked him about these channel errors (corrected errors) Motorola MG8702. I see millions of errors on channel 24 (earlier) and now I see millions of corrected errors on channel 32 for example now:
I need to send in my event logs as they do not seem to think I have an issue so that is why I'm here this has been going on for months.
Thanks for any help or understanding,
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XfinityMartyR
Official Employee
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1.5K Messages
10 months ago
Greetings, dishawbr. Thanks for reaching out to our Community Forums. Did you get a chance to try the Internet Troubleshooting Tips that
@user_noname suggested?
4
0
EG
Expert
•
107.4K Messages
10 months ago
@rocky1158 wrote;
"I see millions of corrected errors on channel 32 for example now:"
FWIW. The OFDM channel is a very wide bandwidth channel that packs a lot of data within. Due to that fact, seeing a large number of corrected errors is normal. The FEC (Forward Error Correction) circuitry / system is doing its job. The vast majority of those errors are *corrected* ones. It's the *uncorrected* ones that can be problematic if they are numerous.
(edited)
2
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rocky1158
Visitor
•
2 Messages
10 months ago
OK, First off Thanks everyone for trying to help me.
The problem I'm seeing is with random video buffing on my media players (Roku's connected with ethernet cables) and all these errors on my Modem. Seems like the buffing may be occurring as these errors occur. Connection Speed is not an issue 900+Mbps most of the time. This has been going on for months now and I have had some up and down service mainly in the a.m. hours (mid morning) but the buffing problem randomly all day.
I searched for answers and some of these are upstream errors? Too much noise on the line? Too much signal strength?( which has been a problem a few times in the past) So here are a few I see I don't have the foggiest idea about:
1) Critical /SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
2)Critical /No Ranging Response received - T3 time-out
3)Warning /MDD message timeout
4)Warning /RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
5)Warning /Dynamic Range Window violation
6)Warning /RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW
I have a simple setup with my Modem /Gateway just on the other side of the wall where my cable comes in. I have ran 2 different (different brands) quad shielded coax (approx. 10ft runs) with Digicon connectors with no change. I have tried 2 different modems: ArrisSVG2482AC and this new MG8702 with no change. I'm seeing the buffing on more than one of my media players again connected with a CAT5 cable.
Picture me scratching my head... I always get the tough problem it seems.
Thanks again,
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