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It's not technically supported by Xfinity but as others have stated, claiming the model number as the SB8200 will allow them to provision it with the proper boot file. I have even noticed an an extra 5mbps upload on top of the typical 40mbps I was getting with the ISP rental. If the CM8200 isn't officially supported by your ISP you're probably better off getting the SB8200 since it's not to much more brand new. I really wanted black though and I did save a few bucks. There is a "Do Not Use" sticker taped over one of the ethernet ports though this does not matter for me as I am not using LAG. If you want a more future-proof modem I'd go for the Motorola MB8600 or wait and see if Asus ever comes out with a 3.1 modem. The CM8200 is perfect for my 1GB plan and satisfies my refusal to own white electronics.Read full review
Verified purchase: Yes | Condition: Pre-owned
Arris does not support the line touch stone, especially product named CM8200. If you buy this, you are on your own. Modem is stable and works well until it disconnects. Reason for disconnecting: upstream signal needs to be in range of 45-51dbmv for 4 channels. cable providers have 33-55dbmv supported range. They cannot or refuse to increase power on upstream, to meet Arris specification, since it might cause isseues in the sytem, and cable provlider have QOS, to maintain the line. If you have 35-38dbmv upstream signal please use Netgear CM1000, same hardwre with fixed bugs, arris lagging behind. Stay away from CM8200 regardless who your provider is.
Verified purchase: Yes | Condition: Pre-owned
I received the modem on time and installation was easy. Comcast walked me through the activation process and when we ran SpeedTest, I got over 200 Mbs download speed. Very happy with this product.
Verified purchase: Yes | Condition: Pre-owned
Can be activated on Xfinity if you tell them it is *SB8200*. Working great and provides gigabit speeds! Do not try to activate it as "CM8200" or "CM8200A"; Xfinity does not support it under that name (they only have the slower CM820A). BTW, the product I received was more specifically CM8200A, not just CM8200.
Verified purchase: Yes | Condition: Pre-owned
Comcast has a lot of confusion about this modem. Took several phone calls to their tech folks to get someone who could make it work and provision correctly. It is a must to tell them that it is a SB8200 - even though the model stated is CM8200A. Eventually comcast sorts it out and gets it working correctly. Have a lot of patience and keep calling them until you get someone who knows something.
Verified purchase: Yes | Condition: Pre-owned
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