In article ,
"Dave Plowman (News)" writes:
In article ,
John Stumbles wrote:
You should not use copper for data links between buildings. If
you've got separate electrical supplies you may have enough
potential difference between ends to exceed the common-mode
rejection of the ethernet receivers and cause data problems.

Wonder how broadcasting got round this in the old days - all lines between
building were copper. And indeed around the country. Of course most of
these lines were fed via a balancing transformer which would provide low

And [twisted pair] ethernet works exactly the same way -- there's
an isolating transformer at both ends of the cable (rated to 4kV
each IIRC).

voltage isolation - but certainly not from high voltage or lightening.

It won't survive a direct or very close-by hit.
The cost of equipment which does would be considerably more
than the cost of replacing some ethernet cards and routers.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]