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Horrible internet speeds for my plan.
Hi, so my current Router and Modem combo are a TP-Link Archer BE550 and an Arris SB8200. My current wifi plan is the Gigabit X2 which offers up to 2100Mbps down, and 300Mbps up. I know with my current setup I won't be receiving the full benefits, BUT, I should not be seeing only 500-600Mps down and 5-6Mps up. I logged into my Modem's admin page, and my event log shows critical events as follows multiple times
| 01/12/2025 20:35:43 | critical | 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; |
| 27/11/2025 23:58:56 | critical | Config File Rejected due to Invalid or Unexpected TLV 11;CM-MAC=[Edited: "Personal Information"]-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1; |
| 30/11/2025 23:46:52 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1 |
I could post the entirety of the event log if requested further, but these are the critical errors that I'm seeing. From some research, the T3 error is what has been causing me upstream issues.
I'm not too sure what TLV 11 is responsible for but I figured it would hurt to post that one as well.
If anyone could possibly help me I would appreciate it, and if any further information is needed just let me know. Thank you in advance.
BruceW
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26.9K Messages
4 hours ago
The SB8200 is not compatible with Gigabit internet service. Comcast/Xfinity rates it for wired download speeds "up to 957, 936 Mbps, or 934 Mbps" depending on the device version. It isn't compatible with their "enhanced" upload speeds either.
Follow the "See all modems" link near the bottom of https://www.xfinity.com/support/internet/customerowned, and then under the "Compatible Modems" heading click the Arris list. Using devices on Internet speed tiers for which they are not compatible with tends to produce unexpected results, often speeds well below the ones you are paying for.
AFAIK Comcast/Xfinity has never said how they provision devices operating on speed tiers they're not compatible with. All I can tell you is that many customers who tried it have reported that they don't get full speed. There's a tendency to think the device will operate at the maximum speed it is capable of, but that doesn't seem to be the case. Instead, incompatible devices often seem to be provisioned to run at speeds well below what they should be capable of.
The T3 and "Commanded Power in Excess" errors may be due to incompatibility, or to faulty coax cable or connections. Please see Internet Troubleshooting Tips.
You need to either get a device compatible with X2 Gigabit, or drop back to a plan speed for which the 8200 is compatible.
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