Thanks Windigo!

I did actually know that, but my brain refused to come up with anything useful on the spur of the moment.

I spent time over many years during my mainframe days making serial cables (RS232, RS423) where this was pretty much the same. The varieties of "Null Modem" cables with crossovers *was* something I knew quite well, but have largely forgotten now :-)

I don't think I have ever used a crossover CAT5 or CAT6 cable though, come to think of it.

Maybe we need more shows on the details of connecting devices together?