28 Jun
2018
28 Jun
'18
1:20 p.m.
On 06/28/2018 09:45 AM, Eric Smith via cctalk wrote:
Of course, this isn't specific to Ethernet. It can
happen with e.g.
TIA/EIA-232 (formerly RS-232) as well, and in fact that is even more common
in practice, because Ethernet is transformer-isolated at each station, but
TIA/EIA-232 is usually not.
So, on a TIA/EIA/RS-232C DB-25 connector, what's the official position
on pin 1? The standards calls it PGND = Protective ground and most
reference seem to indicate that this is chassis/earth ground at both
ends of a cable.
--Chuck