Xbox 360 Internet connection?

Hey just a quick question but everytime i play an xbox 360 game online for xbox live like Call of Duty Modern Warfare 2 or Halo my connection is always bad. But when i unplug my computer Ethernet cord to my computer to my router it just goes up and i have good connection. Does anyone know how i can get good connection while my internet is up with the Ethernet cord plugged into my computer to my router in at the same time without bad connection or aka lagging?





Thanks!Xbox 360 Internet connection?
Here's how it works, because you are using jack there hooked up to the same connection which interfears with the connection everytime its hooked in.