3 Messages
Arris SB6183 modem and Netgear CM700 modem upload speed problems
My internet plan is 150 download/100 upload. It’s the lowest plan available in my area, however I am not getting even half of the upload speed. I am getting 150-160 download, but only getting around 20 for upload. In the past 24 hours I’ve been with many tech agents, and all of them said that my SB6183 modem is capable of up to 130mbps upload speeds. They all sent many signals and did reboots, we did multiple speed tests on Xfinity’s speed test site and speed test.net, but nothing improved with the upload speed. The last tech agent I spoke with created a ticket for the “advanced technical support” team to look into. The Agent said to leave the modem on until tomorrow, then said that the advanced team will configure/provision the modem better on their end to get more upload speed, and that they will call me tomorrow morning. I guess I will be on the lookout for the call from them. One of my friends who’s in another apartment building next to mine has the same plan, same modem, and same upload speed issue. The only difference was that at the beginning of the year he initially signed up for the 100mbs down/10mbps upload , but then Xfinity did free upgrades to everyone’s speeds in the community so he gets 150mbps down, but he is having the same upload speed problem as me, not getting anywhere close to 100mbps upload speed. He has another modem he tested out a few days ago, the Netgear CM700, and it couldn’t get above 20mbps upload speed either, even though agents told him his modem can handle over 100mbps upload speeds.
Does anyone know why it’s so difficult for Xfinity to increase the upload speeds?
BruceW
Gold Problem Solver
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26.3K Messages
11 months ago
Neither of those devices are approved for the new 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/2024.05.17%20Full%20List%20of%20Compatible%20Devices.pdf, but this changes from time to time).
Realize that although Comcast calls some devices "Approved" and some "Recommended", for all but a few devices those designations only mean "approved/recommended for use with their Internet service", and not necessarily approved for the new upload speeds.
You need one of Comcast's newer rental gateways (XB6, XB7, XB8) or one of the few retail devices shown in the "Next Gen Speed Tier" group with an upload speed rating in the "All Compatible Devices" PDF. Also see the Reddit link, which lists the approved devices as well as other requirements for faster upload speeds. Comcast could make all of this much clearer, but they have chosen not to do so.
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user_szsc6m
3 Messages
11 months ago
@BruceW the fact that this information is not relayed to none of the 5+ tech agents I spoke with nor to the public clearly, says a lot about the poor communication from Comcast. Even the “All Compatible Devices" PDF should clarify this upload speed issue and that 100mbps upload speed is considered “next gen”, and not just a basic “update/upgrade” like it was made out to be. In that PDF of devices, nowhere does it mention upload speed starts and limits for “next gen” upload speeds, nor does it mention the upload speed limits for most of the modems outside of the “next gen” modem recommendations. I asked every agent I spoke with if my modem is compatible with the 100mbps upgrade, and everyone said “yes, it is capable of up to 130mbps and more”. Now if I get a call from the “advanced technical support team” tomorrow as they said they were going to call me, I almost guarantee I’m going to have to explain all this to that agent too, unless they miraculously know. I’m sure Xfinity could push out upload speed provisioning configs for modems like the SB6183 and CM700, especially as they both have hardware capabilities to reach 100+mbps upload speeds, yet Xfinity has continued to go down the path of limitations and redundancies. Now I either think about buying one of the retail “next gen” modems, or I switch providers. Who knows if those “next gen” modems will actually even uphold the advertised upload speed as maybe there’s another missing piece of info not clearly communicated or some other catch. This is truly unacceptable, do better Comcast…..
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