[84500] in North American Network Operators' Group
Re: CAT5 surge/lightning strike protection recommendations?
daemon@ATHENA.MIT.EDU (Mark Radabaugh)
Tue Sep 13 22:34:26 2005
Date: Tue, 13 Sep 2005 22:31:29 -0400
From: Mark Radabaugh <mark@amplex.net>
To: nanog@merit.edu
In-Reply-To: <200509140210.WAA05009@sigma.nrk.com>
Errors-To: owner-nanog@merit.edu
David Lesher wrote:
>
>Surge protectors can not protect you from ground differential issues.
>
>
True enough - but 10/100 Ethernet is normally isolated by the
transformer on the Ethernet transceiver. AFAIK there is not a
connection between the signal lines and ground. Isolation is 1500V for
the magnetics I checked.
Off course all bets are off when lightning strikes since the voltage
tends to be just a tad higher than 1500 volts.....
Mark Radabaugh
