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Posted by Joey on July 6, 2007, 12:39 am
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Thanks... I did just dig up the BlackBox network book, but nothing
good.
Yeah on the voltage potential, that always bugs me. I've used various
10/100 extenders a few times with success. They're supposed to be
optoisolated, but who knows! :) The best solution was to move to
fiber of course... sounds like that will probably be the only
solution here. Get the tractor. Unless they want some aerial line.
Thx
J
On Thu, 05 Jul 2007 18:30:18 GMT, Robert Redelmeier
>Joey <joey29034atyawwhodotcom> wrote in part:
>> Does anyone know of any ethernet extender type devices to
>> establish a gigabit link over 2 pairs of copper? Have a
>> short (100') inter-building link but can't run fiber or
>> copper for that matter (historic buildings, concrete all
>> around, squat for conduit). Have to use limited existing
>> Cat 5 copper. Only 2 pairs available which are running at
>> 100'TX now :( No cost effective wireless out there, is there?
>
>Check http://www.blackbox.com . IIRC, there was a standard
>under development for gig over 2pr, but less than 100m.
>Maybe someone built silicon.
>
>It will be expensive, and worse it will be vulnerable to lightning.
>Any nearby strike will raise one buildings ground-stake above
>the others, so the ethernet will be a new ground path. When that
>exceeds the xfo isolation around 500V, electronics will fry unless
>separate protection has been provided.
>
>-- Robert
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