how are you intending on having you computer AND Xbox on the net...router from the cable modem? using the comptuer as a server?...
first off im assuming the xbox live setup has an ethernet controller or something? as in it hooks up via ethernet
if you decide to get a router setup, find a cheap cable/dsl router...then get 2 HPNA to ethernet bridge units from staples.com, netgear model PE102...each are $184.99 BEFORE pricematch...pricematch the 2 units to the price of 2 units + shipping at
www.buynetgear.com...buyneatgear.com has them for $80 each, and there is $11.53 shipping on it (i got it when shipping was $12.30 like one week ago...)...
Staples total: $369.98 (before tax)
Buynetgear total: $171.53 (includes $11.53 shipping)
Difference: $198.45
10% difference: $19.845
Total at end: $151.685
Because the pricematch is SO LARGE (i PM'd only one unit, still, the difference was a smidge under $100) then have to send it up to higher level to get it passes...ends up Staples corporate passes it. They call you back in 2 days telling you how it goes. They gave me a ridiculous pricematch of $126.51 (instead of the expected $83.02 for one unit)...i called them up, they routed me to staples corporate and i got the $43.49 in credit. Works great to convert phoneline to ethernet.
hook up one PE102 unit to the router and into the phoneline...(make sure you can have both units on the same phoneline, units wont work if not on same phoneline)...then plug the other PE102 into the phonline and the Xbox live ethernet controller...
Should work like gold.
PE102 units go at 10 mbps.