A:AnswerI think the quick answer is none. We replaced our Cox modem with the Nighthawk. I simply switched devices, screwing the terminal end of the Cox (internet) cable into the back of the new Nighthawk modem. Our TV was already operating off our old wireless router so we paired the TV with Nighthawk wirelessly. The conversion process was easy but took most of my afternoon to complete.
A:AnswerYes, I have Comcast Xfinity and this modem/router is compatible. It does not work with Xfinity Voice, but is great for TV and Internet! I replaced the modem/router I was renting from Comcast with this one and noticed an increase in speed. Highly recommend!
When I purchased it, I was also concerned about compatibility with Xfinity, but it clearly states that it is in the product description and is even printed on the box!