Actually, i've been using a normal 4-wire standard telephone cable which is 20M long (not in the wall, it's just laying on the floor..) and my LAN works just fine!
I would like to get more info. about cabling, if someone can explain the advantages of using a shilded (not nessesarly Twisted) cable.
As for you, you may try using your phone cable.
(BTW: i am using a cross-over cable)