A fairly basic question - which pins are used to carry the Ethernet signal through the cat5 between my router and the RJ45 socket in the wall? I've used the 568B standard throughout the house. I'm asking because inevitably there is one place where I haven't got enough cables, and I want to do a non-standard kludge. If the signal requires two pairs then I can only squeeze two either signals down one piece of cat5. But if only one pair is needed I could get four signals down it.