2 Messages
Can't get more than 23 Mbps Upload When it should be closer to 115 (per Broadband Facts Sheet)
I've tried getting help via the chat and via phone but it's been a waste of time (I can bake multiple pizzas in the time it takes to 'refresh' a modem).
The chat person was actually nice and tried to be helpful, but was seemingly unable to be. They had someone call me to clarify things over the phone, but that person just wanted to get off the phone as soon as possible and upsell me on a better internet plan. Seriously, it was him personally apologizing and saying he's going to make it better by providing me a discount on the 2Gbps plan and I'll only have to pay $20 /month more. The slow upload was blamed on the work being done nearby, but it has been like this since I renewed the contract last year. The answer to that was, "use our modem because it can completely utilize our network unlike the other modems" and I know that isn't true.
I'm not here to vent though. I just want to get the upload speed that I'm supposed to be getting, but I can't seem to get any real help from this company.
I have a Motorola SB8600 and a Motorola SB8611. Neither get more than 23 Mbps Up, which happens to be close to the rate my previous contract had. I renewed my contract a while ago to get a higher upload speed because that's what was advertised.
Speed test history: https://imgur.com/a/W4Np8pd
Broadband facts: 
BruceW
Gold Problem Solver
•
26.1K Messages
11 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 new upload speeds.
Neither the SB8600 nor the SB8611 are compatible with the new higher upload speeds. Only a few retail devices are. See the "Next Gen" list at the top of 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/2024.09.18%20Full%20List%20of%20Compatible%20Devices.pdf, but this changes from time to time). Also see:
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 with an upload speed rating in the "All Compatible Devices" PDF:
The Reddit link (if they ever get the page back online) lists the approved devices as well as other requirements for faster upload speeds.
Comcast could make all of this much simpler and clearer, but they have chosen not to do so.
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suprsaw
2 Messages
11 days ago
Thanks for the information.
It really bugs me that they consider 115 mbps "nextgen" as if that's a fast upload speed when compared to literally all other ISPs.
Also, how is it not considered an anti-competitive business practice to reduce internet speeds when using other brands of modems?
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user_ycy9me
3 Messages
8 days ago
I had the same issue happen this week. They definitely throttled the speeds. I was regularly getting 150mbps upload with the xfi router and now I’m getting 20mbps. I also noticed in my account that they changed the upload speed to reflect the change. Don’t know what to do here but they definitely [Edited: Profanity] us over. I changed to the xfi modem last year so get higher upload speeds too and am paying extra for that now.
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