Regrettably, the airport is two floors above the would-be location of the xbox.
Looking at the xbox paraphanalia, it seems to state that if you wire directly into the xbox, and then to the computer (or in my case, the airport) you cannot use the internet while the xbox is on. I guess that can be circumvented by a router, which would split the signal into two, one to the airport and one to xbox. Is that correct? This is all hypothetical, anyway, since the line comes into my house far from the xbox.
What is Linksys device? Is there a link which describes it?