I use SBC Yahoo DSL with a speedstream dsl modem. I changed ethernet cables and suddenly couldnt get connected. When I wwent back to the old cable- it connected just fine. I tried yet another cable and it once again didn't work. The problem I am having is I am trying to connect up a router but apprently I need this special ethernet cable. Looking at the cables the one difference I noticed is the one that worked says 75 (degree sign) while the ones that don't work say 80 (degree sign) are there different kinds of ethernet cable? Not all ethernet cables are the same?