David Duffy (AVD) wrote:
> So, we're all agreed that differential signals (RS485 for example)
> travelling between places of differing earth potentials should be
> isolated.  That isolation doesn't negate the need for the common
> reference conductor, it just means the I/O sections are floated with
> respect to earth.

Twisted pair ethernet is a example of isolated differential signals where
there is not common reference conductor.


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