No idea which xFinity equipment you have. All my boxes are all wifi based. No Cat 5 hardwire connections needed.
I have the Coax connected Decoder box ( if that is what it is called) in the bedroom in the Armoire.
This box talks to the set top boxes and the Router. I put the router in the center of my house and I get a signal everywhere, even all the way out to the curb.
Have xfinity change out your boxes.
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