I've just got a whole load of plugs and wire from maplin, as well as a nice crimping tool and some strain relief boots too. Have been making up a few cables.... I made the first without re-reading the various how to guides, and just assumed that so long as all the wires on one plug in the same order as the other, it would all work fine. (wait for it) and it did work fine. Despite what you're supposed to do which is split one pair (green or orange depending on type a or b) to pins 3 and 6... any way, I found wiring each pair in order worked, but that was probably just because it was a short patch cable, with longer cable the crosstalk would probably have become much more of an issue. I'm going off track here...ah yes, the question.... I have heard, that only 2 pairs in the cable are actually used - RX+, RX-, TX+ and TX-. Is this true ? in which case why the hell are there 2 pairs unused in there ? Why can I not modify one cable to carry two cable's worth of data ?