🚀 go-pugleaf

In article <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! I am wondering why this is. Antenna effects,
>current loops or something else. Does anyone know why this is the case?

Current loops.  Ground at one point isn't necessarily at exactly the same
voltage as ground at another.  Multiple grounds could result in quite
large currents flowing in the shield, producing both interference and
electrical hazards.

The original Ethernet spec called for no grounding at all, and that's still
the way most people wire their Ethernets.  There are weak safety arguments
for not leaving it floating, hence the change of spec.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry