What's the length limit for a cat5 cable? I made a straight-through cable which is more than 100' in length, possibly 200'. When I connect it to the PC and the router, the lights on the ethernet card and the router turns on like it should, but I can't gain access to the router's setup page. I'm guessing it's because the cable is too long and that the integrity of the signal is weakend due to the length. I made another cable of length 6' and everything worked fine. Also, when I crimped a straight-through cable with all 8 wires and connect it to the PC and router one way, the light on the router blinks while the ethernet card doesn't light up at all. If I only use #1,2,3, and 6 wires, the lights turn on solid for the both ethernet card and router. I don't think it should make a difference if I use the 4 or all 8 wires; why does it?