Type "A" config is a crossover cable, right? Computer to computer? Type "B" is your standard internet/LAN cable, right? I'm not looking for any major DIY help. I've got the gist except for the part below :-)
Very simply: I wired a LAN RJ45 jack and the instructions said "for residential applications follow the 568A diagram". So the jack(coded for A and B configs on back) is wired as an "A". Now I whip out my crimper to make a cable/plug and look at the back of the crimper package, find the wiring pattern for "A", and make my plug on the end of my cord. THEN I compare mine to some other pre-fab RJ45 wire/plugs and notice that all of the other plugs appear to be wired as "B". Knowing that one of those prefabs I was looking at used to serve as my home internet cable I rewired my "A" plug as a "B" and plugged it in. It worked!
Bottom line: I have an "A" config jack and a "B" config plug and my internet works fine. WHY??? And what should I change? Thanks.