Accessing internet through Coax

Hello,

I live in an apartment and i'm trying to connect my xbox360 to the internet. I'm upstairs, my modem and router are downstairs. I'd prefer not to have to get a wireless adaptor for my xbox, but if that's the only way, i'll settle with that.

We have Comporium internet. I can get cable if I hook a cable box up to the coax port in the wall upstairs. I have been looking at coax to ethernet adaptors, hoping I could go from the coax in the wall, to the adaptor, right into the back of the xbox. Is this possible?


I would think it's a feasible idea, but I think there may be some sort of authentication (in the case of tv, a cable box) to connect to Comporium.

Thanks for any/all replies!