3 Messages
Arris SB8200 Signal check
Hello, I have been having multiple connectivity issues recently. I updated my modem from a linksys CM3016 to an Arris SB8200 which is Docsis 3.1 hoping to resolve the issues. I am still having moments where my internet is still connected but is very slow and almost unusable. Loading a website like google.com takes over 30 - 45 seconds. I cant join teams calls or stream tv. My download speeds do not go above 120 mbps and upload never really gets above 3 mbps. When I am facing the issues my download speed is 40 mbps and upload is less than 1 mbps. I was just recently upgraded to the 500 mbps/100mbps download upload speed. Please see my signal status information from my modem, is there something else I should be checking to troubleshoot?
| Downstream Bonded Channels | |||||||
|---|---|---|---|---|---|---|---|
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 44 | Locked | QAM256 | 657000000 Hz | 0.8 dBmV | 42.9 dB | 1 | 0 |
| 13 | Locked | QAM256 | 471000000 Hz | 1.0 dBmV | 43.7 dB | 3 | 0 |
| 14 | Locked | QAM256 | 477000000 Hz | 0.9 dBmV | 43.4 dB | 7 | 0 |
| 15 | Locked | QAM256 | 483000000 Hz | 1.4 dBmV | 43.6 dB | 1 | 0 |
| 16 | Locked | QAM256 | 489000000 Hz | 0.6 dBmV | 43.4 dB | 7 | 0 |
| 17 | Locked | QAM256 | 495000000 Hz | 1.5 dBmV | 43.8 dB | 3 | 0 |
| 18 | Locked | QAM256 | 501000000 Hz | 1.1 dBmV | 43.7 dB | 1 | 0 |
| 19 | Locked | QAM256 | 507000000 Hz | 1.2 dBmV | 43.8 dB | 0 | 0 |
| 20 | Locked | QAM256 | 513000000 Hz | 1.1 dBmV | 43.6 dB | 1 | 0 |
| 21 | Locked | QAM256 | 519000000 Hz | 0.1 dBmV | 43.2 dB | 0 | 0 |
| 22 | Locked | QAM256 | 525000000 Hz | 0.7 dBmV | 43.5 dB | 1 | 0 |
| 23 | Locked | QAM256 | 531000000 Hz | -0.3 dBmV | 43.0 dB | 1 | 0 |
| 24 | Locked | QAM256 | 537000000 Hz | 0.8 dBmV | 43.4 dB | 0 | 0 |
| 25 | Locked | QAM256 | 543000000 Hz | 0.0 dBmV | 43.1 dB | 0 | 0 |
| 26 | Locked | QAM256 | 549000000 Hz | 0.7 dBmV | 43.3 dB | 1 | 0 |
| 27 | Locked | QAM256 | 555000000 Hz | 0.5 dBmV | 43.3 dB | 6 | 0 |
| 28 | Locked | QAM256 | 561000000 Hz | 0.1 dBmV | 42.9 dB | 1 | 0 |
| 29 | Locked | QAM256 | 567000000 Hz | 0.4 dBmV | 43.2 dB | 0 | 0 |
| 30 | Locked | QAM256 | 573000000 Hz | -0.2 dBmV | 42.8 dB | 1 | 0 |
| 31 | Locked | QAM256 | 579000000 Hz | 0.7 dBmV | 43.3 dB | 1 | 0 |
| 32 | Locked | QAM256 | 585000000 Hz | 0.0 dBmV | 42.8 dB | 2 | 0 |
| 33 | Locked | QAM256 | 591000000 Hz | 0.9 dBmV | 43.3 dB | 1 | 0 |
| 34 | Locked | QAM256 | 597000000 Hz | 0.6 dBmV | 43.2 dB | 1 | 0 |
| 35 | Locked | QAM256 | 603000000 Hz | 1.2 dBmV | 43.4 dB | 0 | 0 |
| 36 | Locked | QAM256 | 609000000 Hz | 1.1 dBmV | 43.3 dB | 0 | 0 |
| 37 | Locked | QAM256 | 615000000 Hz | 0.7 dBmV | 43.3 dB | 2 | 0 |
| 38 | Locked | QAM256 | 621000000 Hz | 1.6 dBmV | 43.6 dB | 1 | 0 |
| 39 | Locked | QAM256 | 627000000 Hz | 1.2 dBmV | 43.4 dB | 2 | 0 |
| 40 | Locked | QAM256 | 633000000 Hz | 1.7 dBmV | 43.6 dB | 1 | 0 |
| 41 | Locked | QAM256 | 639000000 Hz | 1.1 dBmV | 43.4 dB | 1 | 0 |
| 42 | Locked | QAM256 | 645000000 Hz | 1.6 dBmV | 43.5 dB | 1 | 0 |
| 43 | Locked | QAM256 | 651000000 Hz | 1.3 dBmV | 43.3 dB | 0 | 0 |
| 193 | Locked | Other | 690000000 Hz | 1.8 dBmV | 41.8 dB | 313759774 | 0 |
| 194 | Locked | Other | 957000000 Hz | 0.0 dBmV | 41.2 dB | 313759774 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
| 1 | 1 | Locked | SC-QAM Upstream | 16400000 Hz | 6400000 Hz | 45.0 dBmV |
| 2 | 2 | Locked | SC-QAM Upstream | 22800000 Hz | 6400000 Hz | 46.0 dBmV |
| 3 | 3 | Locked | SC-QAM Upstream | 29200000 Hz | 6400000 Hz | 45.0 dBmV |
| 4 | 4 | Locked | SC-QAM Upstream | 35600000 Hz | 6400000 Hz | 45.0 dBmV |
BruceW
Gold Problem Solver
•
26K Messages
4 months ago
The signal stats you posted are just fine, but please post the Event Log to give us a fuller picture of the modem's performance.
Note that the SB8200 is not approved for the higher upload speeds. See:
And especially see the "All Compatible Devices" link near the bottom of https://www.xfinity.com/support/devices (at the moment it points to https://assets.xfinity.com/assets/dotcom/projects/cix-4997_compatible-devices/2024-07-18_Full-List-of-Compatible-Devices.pdf, but this changes from time to time). Realize that although Comcast calls some devices "Compatible" and some "Recommended", for all but a few devices those designations only mean "compatible/recommended for use with their Internet service", and not necessarily approved for the new upload speeds.
Edit: to correct modem model #
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user_ke20w8
3 Messages
4 months ago
Hello, I want to thank Bruce for his reply, I will review it in detail soon, just wanted to post a new status screen. I was able to capture this while the internet was not working, looks like there are a lot of "uncorrectables" not sure what that column means?
Also I unscrewed the coax cable outside my house where it connects to the coax that enters my house and the wire was wet and dripping water. Does this mean I need a new wire run and could this cause the intermittent issues? I am able to refresh this forum and (hopefully) post this message but streaming and other things do not work right now.
Typically this will correct itself in 5 minutes.
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BruceW
Gold Problem Solver
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26K Messages
4 months ago
Data sent to modems includes error correction data. The "Corrected" column is a count of data blocks that contained errors that the modem was able to correct, while the "Uncorrectables" column is a count of data blocks that were so damaged that the modem was not able to correct them.
Yes and yes. Waterlogged coax tends to cause problems and needs to be replaced.
I'm not sure why your post is not visible. The only thing I see that might be a problem is if the Forum security software interpreted the 10 digit error counts as telephone numbers. Posting images or one of the "don't post" items (see https://forums.xfinity.com/conversations/guidelines/xfinity-forum-acceptable-use-policy/602d9c64c5375f08cd574236) can cause messages to be made Private for a time, as they must be edited and/or approved by the Forum Moderators before the message becomes generally visible.
To arrange for Comcast/Xfinity to replace the soggy coax 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/. Comcast should replace outside coax cable at no charge.
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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user_ke20w8
3 Messages
4 months ago
thanks Bruce, I have a tech coming out on Friday, do i tell him about the water in the coax and he will take it from there? Is there anything I should be prepared with? Just dont want a situation where the tech says everything looks good on their end/area node etc...
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BruceW
Gold Problem Solver
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26K Messages
4 months ago
I hope so! It would probably be a good idea to describe the slowdowns you've been having as well. Please post how this turns out, and good luck!
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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