To add to what Steve said, the Lynx Dongle uses the 1st pair (white/orange, orange) on the Cat5 cable, so you just have to make sure whatever hardware you are using also uses that pair, or you will have to make a cable to move that pair to whatever pair your hardware uses. Like the LOR hardware uses different than that.
The Etherdongle uses all 4 pairs, so if you use that, again the same would apply, you might need to make a conversion cable. also there is a combiner/splitter that RJ makes that you can use to split the 4 pairs back into using just the white/orange, orange pair.