[...] UTP/RJ45 (I know there is no such standard as
RJ45) [...]
Actually, I think there was/is; it just isn't what it generally gets
taken as - it's a (now fairly obsolete) standard for putting phone
service on an 8P8C connector. The Wikipedia page Registered_jack has a
sketch of some of the confusion that, from what I can tell, is
reasonably accurate.
In particular, speaking of it as an "RJ45 connector" is fair in the
same sense that it's fair to speak of a DE9 as a "peecee serial port
connector" - it's the connector used by RJ45 even when what it's being
used for isn't RJ45. But this tends to lead to further confusion, so I
prefer to avoid it....
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