🚀 go-pugleaf

In article <sehari.724504235@class1.iastate.edu> sehari@iastate.edu (Babak Sehari) writes:
>In <1992Dec15.202004.15878@ucsu.Colorado.EDU> barr@tramp.Colorado.EDU (BARR DOUG) writes:
>
>>Some specs I have call for ethernet coax to be grounded in one location
>>and one location only!

>If he distance is large enough, and the two end points are at two different
>potentials, you might blow up the whole computer. 

	Not possible.  Ethernet is electrically isolated from your
computer (because the computer is generally grounded, and because
ethernet must, by specification, NOT be grounded, this is obvious).
I think it takes 800V or so of insulation to make a compliant
ethernet port (which is a problem for some printed circuit
wiring practices).

	As previous posters have noted, two problems arise.  Electrical
fault currents can flow in ground wires, and having two connections
to ground makes the ethernet a current-carrying conductor.  
Possible results include melting the ethernet wiring.

	Second, the small stray currents that can be coupled into
the ethernet shield from multiple 'antenna' connections can be
a troublesome noise source, causing many retransmissions.

	The first problem is the more serious: rewiring a half building
of ethernet wiring (etherhose) can make one WISH it had just
fried a PC somewhere.

	John Whitmore