Speedi1's profile



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Sat, Apr 17, 2021 2:22 PM

Nighthawk CM1200 Incompatible with 1.2Gb Service?

Looking at my device compatibility with the new 1.2Gb service I have, it claims the cm1200 is incompatible. I know this modem can handle the speeds so what's the story?



Gold Problem Solver


22.3K Messages

23 d ago

The page at https://www.xfinity.com/support/devices/ lists 5 retail devices approved for 1.2 Gbps. They all appear to have 2.5 Gbps Ethernet ports, the CM1200 does not seem to have one.

It might be possible to get a bit more than 1 Gbps through the modem using a router compatible with its link aggregation, but if Comcast doesn't deliver 1.2 Gbps to the CM1200, I don't think it can provide the full benefit of the 1.0 to 1.2 speed upgrade.

Official Employee


157 Messages

21 d ago

Good morning @Speedi1 and thank you so much for reaching out to our Digital Care Team on our forums page. To ensure your modem is compatible please use the My Device website here https://comca.st/3tx9KV4 to easily check if your device is approved for Xfinity Internet service.  My Device shows a database of all approved cable modems. You can also use this site to make sure your modem or router supports your selected Internet speed tier.


What speeds are you currently experiencing? If you are having connection issues, rest assured you've reached the right team to help. What troubleshooting steps have you attempted thus far? 

I am an Official Comcast Employee.
Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
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