An easy way to tell if it is a crossover cable is to look at the ends with the tab down, if the wiring is the same on both sides than it is a crossover cable, i.e. one for transmitting and one for receiving. A crossover cable operates is half duplex, as in it can only be sending or receiving but not both.....check to see if the cable allignment is the same on both sides, thats how you can tell.