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Upload speed
I have an Arris T25 cable modem, which is DOCSIS 3.1 32x8. My download plan and speed is 800 Mbps. My upload speed is 23 Mbps. Is that the plan’s limitation?
New Poster
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4 Messages
I have an Arris T25 cable modem, which is DOCSIS 3.1 32x8. My download plan and speed is 800 Mbps. My upload speed is 23 Mbps. Is that the plan’s limitation?
Official Solution
BruceW
Gold Problem Solver
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26.3K Messages
10 months ago
Comcast rates the T25 for use with plan speeds "Up to 949 Mbps", see https://www.xfinity.com/support/devices.
If you are wondering about devices for the new faster upload speeds see the "Next Gen Speed Tier" group in the "All Compatible Devices" PDF link near the bottom of that page (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). Also see https://www.reddit.com/r/Comcast_Xfinity/wiki/knowledgebase/next-generation-internet/ which lists compatible devices and other requirements.
Realize that although Comcast calls some devices "Compatible" and some "Recommended", those designations only mean "approved for and compatible with their Internet service", and not necessarily compatible with your speed tier.
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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BruceW
Gold Problem Solver
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26.3K Messages
10 months ago
Yes. All all plans are limited to the speeds Comcast specifies for the plan and the device you are using, upload and download.
Recall that cable internet uses systems that are descendants of CATV systems which started out with no upstream data path at all. As the need arose to send data back to the cable company the industry added an upstream path, but failed to see how rapidly demand for upstream data would grow. They are still playing catch-up, replacing huge amounts of low speed equipment with much faster hardware at enormous cost, and reconfiguring bandwidth allocation. Even so, plan upload speeds for the fastest devices on the fastest internet plans are limited to less than half of the speed Comcast rates the device for, which is itself less than the speeds manufacturers rate them for, even in "upgraded" NextGen areas.
Modems and gateways not listed in the "Next Gen Speed Tier" group at the top of the "All Compatible Devices" PDF will not be able to use the higher upload speeds that the industry is currently rolling out. AFAIK they've never said what the requirements are for a device to be approved for use with these new speeds, so we don't know why only a few devices make the cut, or when or if other devices will be added to the list.
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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