But on that one, I know what RJ45 actually means, I imagine you do - but that's a battle lost and the terminology "in use" isn't going to change. Just chill out and let it sail by
I also agree that none of those concepts stops Winston from banging on about other terminologies, so it's curious that he's never complained about this one.
Basically, in ancient history for many people here, there were various ways of wiring a "phone" socket for different functions. One phone line on one pair, two phones lines on two pairs, 3 lines, 4 lines, fax machine with ability to disconnect the phones while it's using the line, etc, etc.
Rather than have service technicians making up their own wiring schemes, someone had the bright idea of doing an instruction book on how to wire the different options - so that the job description could specify RJnn and that gives all the information the tech needs to wire it correctly.
As it happens, the RJ45 wiring scheme uses an 8pin modular connector - the one we use in networking and refer to as an "RJ45" plug. RJ45 actually refers to a single data line with programming resistor. Wikipedia article
And a rant on the very subject !
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