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<p>I'm sure Ethernet officially isolated from ground, but at those
voltages you can be sure lightning is going to find a path to
ground. I'll have to examine those Furse protection circuits... I
wouldn't be surprised to find bypass caps to circuit ground or
large resistors (symmetrical).</p>
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<p>Bob</p>
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<div class="moz-cite-prefix">On 11/6/19 2:19 PM, Scott Dorsey wrote:<br>
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cite="mid:5dc31cda.B2QuUjVf7qFprJDi%25kludge@panix.com">
<pre class="moz-quote-pre" wrap="">Ethernet is a special case because UTP ethernet is completely (well, up to 1KV
if the interface meets specs) isolated from ground on both ends. So you can
run UTP between systems without worry about creating spurious ground paths,
and you have no worries about induced ground currents (as long as the voltages
stay under 1KV).
If you are worried about voltages over 1KV, say you're running a line outdoors
or near a big power ground, or up an antenna tower, you can buy inexpensive
clamping circuits using gas arrestors and clamp diodes to eliminate surge
problems. If that's not enough (and it might not be if you are running up an
AM broadcast tower), fibre ethernet is actually not much more expensive than
UTP.
The folks who came up with the 10BaseT standard were thinking on their feet.
--scott
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<div class="moz-signature">-- <br>
<pre><font class="3D""" face="3D"Courier"">
If you want good sound on your album, come to
Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
Author: <b>Mastering Audio</b>
<a href="https://www.digido.com/">Digital Domain Website</a>
No trees were killed in the sending of this message. However a large number
of electrons were terribly inconvenienced.</font>
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