i have a ethernet cable running about 20 meters from our router. i want to know if it's possible to split this ethernet cable so the person in the room above me (we live out the back of a bvig house) can connect to without having to run another 25 meter ethernet cable back to the router inside. i imagined there would be some type of double adapter like i have on the phone line for the adsl. i imagine putting a splitter on my ethernet line would disrupt the signal but just want to make sure. The guy at tandy reckons we have to buy some router type thing for around 200 bucks. what do you think?