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Arris SB8200 Problems
Hello,
I upgraded my service to 400Mbps a while back but never got more than about 100 Mbps. I had a service tech out who said that my modem was too old (it was DOCSIS 2) so I upgraded to an Arris SB8200. Recently, I have been having a lot of connection issues, and even when plugged directly into the modem with a CAT6 ethernet cable, I can't get higher than about 95 Mbps. I'm also seeing some concerning errors on the modem logs. Here's what I have:
| Procedure | Status | Comment |
| Acquire Downstream Channel | 405000000 Hz | Locked |
| Connectivity State | OK | Operational |
| Boot State | OK | Operational |
| Configuration File | OK | |
| Security | Enabled | BPI+ |
| DOCSIS Network Access Enabled | Allowed |
| Downstream Bonded Channels | |||||||
|---|---|---|---|---|---|---|---|
| Channel ID | Lock Status | Modulation | Frequency | Power | SNR/MER | Corrected | Uncorrectables |
| 4 | Locked | QAM256 | 405000000 Hz | 4.0 dBmV | 42.4 dB | 0 | 0 |
| 5 | Locked | QAM256 | 411000000 Hz | 4.2 dBmV | 42.4 dB | 0 | 0 |
| 6 | Locked | QAM256 | 417000000 Hz | 4.3 dBmV | 42.2 dB | 0 | 0 |
| 7 | Locked | QAM256 | 423000000 Hz | 3.7 dBmV | 41.9 dB | 0 | 0 |
| 8 | Locked | QAM256 | 429000000 Hz | 4.2 dBmV | 42.1 dB | 0 | 0 |
| 9 | Locked | QAM256 | 435000000 Hz | 4.5 dBmV | 42.1 dB | 0 | 0 |
| 10 | Locked | QAM256 | 441000000 Hz | 4.0 dBmV | 41.9 dB | 0 | 0 |
| 11 | Locked | QAM256 | 447000000 Hz | 4.5 dBmV | 42.2 dB | 0 | 0 |
| 12 | Locked | QAM256 | 453000000 Hz | 4.5 dBmV | 42.2 dB | 0 | 0 |
| 13 | Locked | QAM256 | 459000000 Hz | 3.7 dBmV | 41.9 dB | 0 | 0 |
| 14 | Locked | QAM256 | 465000000 Hz | 4.4 dBmV | 42.3 dB | 0 | 0 |
| 15 | Locked | QAM256 | 471000000 Hz | 4.5 dBmV | 42.4 dB | 0 | 0 |
| 16 | Locked | QAM256 | 477000000 Hz | 4.0 dBmV | 42.2 dB | 0 | 0 |
| 17 | Locked | QAM256 | 483000000 Hz | 4.5 dBmV | 42.4 dB | 0 | 0 |
| 18 | Locked | QAM256 | 489000000 Hz | 4.5 dBmV | 42.3 dB | 0 | 0 |
| 19 | Locked | QAM256 | 495000000 Hz | 4.0 dBmV | 41.8 dB | 0 | 0 |
| 20 | Locked | QAM256 | 507000000 Hz | 4.7 dBmV | 42.3 dB | 0 | 0 |
| 21 | Locked | QAM256 | 513000000 Hz | 4.3 dBmV | 42.2 dB | 0 | 0 |
| 22 | Locked | QAM256 | 519000000 Hz | 4.7 dBmV | 42.4 dB | 0 | 0 |
| 23 | Locked | QAM256 | 525000000 Hz | 4.3 dBmV | 42.1 dB | 0 | 0 |
| 24 | Locked | QAM256 | 531000000 Hz | 3.9 dBmV | 41.7 dB | 0 | 0 |
| 25 | Locked | QAM256 | 543000000 Hz | 3.9 dBmV | 41.9 dB | 0 | 0 |
| 26 | Locked | QAM256 | 549000000 Hz | 3.4 dBmV | 41.8 dB | 0 | 0 |
| 27 | Locked | QAM256 | 555000000 Hz | 3.6 dBmV | 41.7 dB | 0 | 0 |
| 28 | Locked | QAM256 | 561000000 Hz | 3.2 dBmV | 41.6 dB | 0 | 0 |
| 29 | Locked | QAM256 | 567000000 Hz | 2.9 dBmV | 41.5 dB | 0 | 0 |
| 30 | Locked | QAM256 | 573000000 Hz | 3.4 dBmV | 41.7 dB | 0 | 0 |
| 31 | Locked | QAM256 | 579000000 Hz | 3.4 dBmV | 41.7 dB | 0 | 0 |
| 32 | Locked | QAM256 | 585000000 Hz | 3.3 dBmV | 41.5 dB | 0 | 0 |
| 33 | Locked | QAM256 | 591000000 Hz | 3.7 dBmV | 41.6 dB | 0 | 0 |
| 34 | Locked | QAM256 | 597000000 Hz | 3.4 dBmV | 41.5 dB | 1 | 0 |
| 48 | Locked | Other | 688000000 Hz | 4.3 dBmV | 38.2 dB | 527251 | 0 |
| Upstream Bonded Channels | ||||||
|---|---|---|---|---|---|---|
| Channel | Channel ID | Lock Status | US Channel Type | Frequency | Width | Power |
| 1 | 1 | Locked | SC-QAM Upstream | 10400000 Hz | 3200000 Hz | 28.0 dBmV |
| 2 | 2 | Locked | SC-QAM Upstream | 16400000 Hz | 6400000 Hz | 30.0 dBmV |
| 3 | 3 | Locked | SC-QAM Upstream | 22800000 Hz | 6400000 Hz | 31.0 dBmV |
| 4 | 4 | Locked | SC-QAM Upstream | 29200000 Hz | 6400000 Hz | 32.0 dBmV |
| 5 | 5 | Locked | SC-QAM Upstream | 35600000 Hz | 6400000 Hz | 32.0 dBmV |
| 6 | 6 | Locked | SC-QAM Upstream | 39600000 Hz | 1600000 Hz | 30.0 dBmV |
| 01/01/1970 00:00 | 2436694066 | 6 | "Honoring MDD; IP provisioning mode = IPv6" |
| 01/01/1970 00:00 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 09/14/2021 23:52 | 68001102 | 3 | "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 09/14/2021 23:52 | 73040200 | 3 | "TLV-11 - Illegal Set operation failed;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 09/14/2021 23:58 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 09/14/2021 23:58 | 82000100 | 3 | "No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 09/14/2021 23:57 | 84000500 | 3 | "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/11/2021 04:55 | 82000500 | 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;" |
| 08/11/2021 04:55 | 68001102 | 3 | "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/11/2021 04:55 | 73040200 | 3 | "TLV-11 - Illegal Set operation failed;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:02 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:02 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:01 | 84000500 | 3 | "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:01 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:43 | 82000400 | 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;" |
| 08/10/2021 23:43 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:43 | 82000400 | 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;" |
| 08/10/2021 23:43 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:43 | 82000400 | 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;" |
| 08/10/2021 23:43 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:43 | 82000400 | 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;" |
| 08/10/2021 23:43 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:43 | 82000400 | 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;" |
| 08/10/2021 23:43 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:41 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 23:41 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 11:14 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 08/10/2021 11:13 | 84000500 | 3 | "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 07/15/2021 08:36 | 82000500 | 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;" |
| 06/19/2021 20:25 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 06/19/2021 20:25 | 82000200 | 3 | "No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 06/19/2021 20:24 | 84000500 | 3 | "SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 06/19/2021 20:24 | 68001102 | 3 | "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 06/19/2021 20:24 | 73040200 | 3 | "TLV-11 - Illegal Set operation failed;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:00 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 04/19/2021 23:43 | 82000500 | 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;" |
| 04/19/2021 23:43 | 68001102 | 3 | "Config File Rejected due to Invalid or Unexpected TLV 11 encoding;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 04/19/2021 23:43 | 73040200 | 3 | "TLV-11 - Illegal Set operation failed;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 01/01/1970 00:09 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;" |
| 04/19/2021 23:20 | 82000400 | 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;" |
| 04/19/2021 23:20 | 84000100 | 3 | "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;" |
| 04/19/2021 23:20 | 82000400 | 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;" |
EG
Expert
•
104.4K Messages
3 years ago
Please redact the CM MAC and the CMTS MAC addresses for your privacy. They are considered to be personal information. Personally identifying information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically. It flagged your post as "Private".
Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) / an upstream channel-return path impairment somewhere.
There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.
You should get a reply here in your topic. Good luck !
(edited)
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Andyross
Gold Problem Solver
•
7.9K Messages
3 years ago
95Mbit seems like whatever Ethernet port on your computer is being used is limiting itself to 100Mbit. You need to make sure it's Gigabit capable and running in the proper mode.
Some info here:
https://www.windowscentral.com/how-determine-wi-fi-and-ethernet-connection-speed-windows-10
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CCDevin
Problem Solver
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735 Messages
3 years ago
@user_4a7974
Good morning! Thank you for reaching out to bring this to our Forums Communities attention. Paying for 400 MBP’s and only receiving a ¼ of that speed is not the experience that we want for you at all. Thank you for taking the time to post your signal logs and work with us to find a solution. I see you have received some great answers already and we would like to help support you as well by checking into the signals on our end and to make sure we identify the root cause of this to correct it.
Would you mind moving this over to a direct message for a while so I can gather a bit of personal account information and take a look at your account, please?
Here's the detailed steps to Direct Message us:
• Click "Sign In" if necessary
• Click the "Direct Message" 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
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