I didn't know what to put for a topic exactly. But here goes for what happened. This is my personal internet.

26 months with xfinity now. The first 24 I had an xfinity modem set up in bridge mode. As I used my own router. The package was "Blast! Internet" In February 2024, they upgraded my area to have 100MBps upload with no change to my pricing. And I received that speed. Both via ethernet and wifi.

However, at the 2 year mark. I had changed from an xfinity modem in bridge mode to a customer own modem, Brand new Arris SB8200. The router and wifi had not changed. It was just a modem swap.

Now this is where I don't know when the upload speed changed. Was it with the modem swap or was it with the internet package swap? "Fast Internet" is what I have now. However, it maxes out at 25 to 30MBps upload. Both ethernet and wifi. Even directly plugged into the modem, in either port. (My modem has the ability to have two internet services from one coax. With two different IP addresses. But I can only plug into one at a time right now. Either upper or lower upon reboot. It won't let me swap while it's on.)

Both internet packages are advertised with upload speeds of up to 100MBps. Obviously I am aware that the download speeds had changed. I believe the Blast was 800 while the current Fast is 500. Either one my actual speed was 150MBps above what I was supposed to get. So Blast was 950 while Fast is 650.

I am wondering if my modem is bad or if they had slowed my upload on their end because I have a customer own modem. By the way, why I waited 2 years to get my own, is because the first 2 year the xfinity modem was included.

KOT

Xfinity Resi accounts have a 25Mb cap on Uploads for a very long time. You might of been grandfathered into an old package that changed when you swapped to your own modem.

A little update, after having 3 techs out here. First one for some stupid reason moved the coax from a grounding block that was grounded to one that wasn't. I wasn't home for that visit.

The second fixed the first one's screw up and also replaced my RG59 from the grounding block to the outlet inside.

The third one had tested both of my purchased modems and they both still got 24Mbps upload. We temporarily attached a rental and activated it on my account. It immediately went to 100Mbps.

So I at least know that my account and the area are able to work with 100Mbps plus upload.

After some investigation and a couple after he left. I discovered something... There are only 5, that's right FIVE modems that are approved to work on xFinity at those speeds. And of course neither my two are on that list.

You can find the list here,

[Link: assets.xfinity.com]

Incase it changes in the future. You can also look up "Next Gen Speed Tier" on Xfinity's website for the list. On that same PDF are other modems that will still work, and my two modems that I have. SB8200 and CM1000 are on That list. But as you can see, there are no "upload speeds". So I don't know how they determine the speeds.

I did order the Hitron CODA56 and will update here once I activate it.

KOT

RG59? Really?

What DocSis versions are shown for each piece? Any incompatibility between them?

Hey, interesting situation you've got there! It sounds like the upload speed drop might be due to the change in your service package rather than the modem itself. Even though both "Blast!" and "Fast Internet" advertise up to 100MBps uploads, there might be differences in how they prioritize or manage speeds. Have you tried contacting Xfinity to confirm the current package details and whether there's any restriction on customer-owned modems? Sometimes ISPs have specific settings or firmware updates that could affect performance. Also, maybe double-check your modem's compatibility with your service plan. It could be a simple config issue!

Yeah, I actually had 4 techs out. But the first one wasn't relevant to this thread because all he did was to remove the Xfinity modem and install my modem. I purchased one from eBay and attempted several times to add it to my account. Chatting with customer service, called CS and they couldn't get it to work. So they sent a tech out. When he spoke with his reps, who we don't have access to as customers. They had more information on the modem that I bought... it was actually one that was owned by Xfinity, therefore a rental. And that was why it wasn't working. Luckily the ebay seller gave me a full refund and paid for shipping back.

Oh, and that tech. REFUSED to replace teh RG59 cable. Because he wasn't there for that kind of call and "frequencies are different for internet compared to TV. So no need to replace it." His words.

That ended up why I had the second tech come out who moved it to a non-grounded block.


Are you asking for the current modems that I have now?

KOT

Grounding the cable feed from the utility is an NEC code requirement and I know you're aware of the problems caused by ungrounded cable feeds.

Spectrum and the other providers stopped using RG59 two decades ago and if you were to call and reach someone in their quality control or repair departments, I don't think they would say that RG59 is OK.

Do you have any scrap RG6 that could be used to sub for the RG59? I would try that to see if it improves.

What do you mean, by "Are you asking for the current modems that I have now"? How many modems are you using and if more than one, how are they connected? Why are you using your own modem? That's the one part that SHOULD come from the provider since it guarantees compatibility with their system- once the modem is right, routers are routers, to a great extent WRT compatibility. I don't mean that a 25 year old POS should be used, but any decent router should provide better speed. I use a Linksys that retailed for $100 and the speed test I did a few minutes ago came in at 565Mbps down/23+ up. I'm using the Spectrum modem.

This I knew, that's why I had them come out again to fix that issue as well as swap out the RG59 for a RG6. I don't have a ladder, so I couldn't do it.


Back in late May I had bought an Arris SB8200v3. And it provided the correct download speeds. But only 25Mbps upload speed out of 100Mbps. Had the techs come out and such. Then I bought a Netgear CM1000 with the same results.

After the tech's visit on Wednesday I discovered the fact that the updated areas, like mine is considered a "mid-split" as the techs called it. There are only a select few modems that are able to get the faster upload speeds.

So for my area, the Hitron CODA56 is one of the modems that is able to work. This list is also area specific. For example my town has a different list compared to a town 15 miles north of me. (As a former Xfinity tech I knew these two towns has a different Head End.)