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Not getting upload speeds I paid for.
I have an Arris S33 and subscribed to the 2100Mbps plan. I am getting the 2100Mbps download, but am only receiving 40 Mbps upload. I am being capped at 40Mbps and not getting the 306 Mbps upload in my plan. I read that there needs to be some provisioning done in the configuration.
BruceW
Gold Problem Solver
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26.3K Messages
2 days ago
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 higher upload speeds introduced in 2023.
The S33 is not compatible with those speeds. Only a few retail devices are. See the "Next Gen" list at the top of the "All Compatible Devices" PDF linked near the bottom of https://www.xfinity.com/support/devices (at the moment that link points to https://assets.xfinity.com/assets/dotcom/projects/cix-4997_compatible-devices/2025.03.25 Full List of Compatible Devices.pdf, but this changes from time to time).
For faster upload 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 at the top of the "All Compatible Devices" PDF:
Comcast/Xfinity could make all of this much simpler and clearer, but they have chosen not to do so.
For additional requirements for faster upload see https://forums.xfinity.com/conversations/customer-service/upload-speeds/677b01a7121aae71d76926bf?commentId=677b05b23423b47b4071a8d0&replyId=677bd66e7699a97c89069e62
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XfinityAmandaB
Official Employee
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2.1K Messages
8 hours ago
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