Sheilded Cat-5E Ground Loop - Myth or Reality?

From: "Barton F Bruce" <>
Date: Wed, 10 Apr 2002 17:04:50 -0400

I was simply pointing out that "ALL electrical installations" seemed a tad
too broad.

> Shielded/screened TP on utility poles? This is an insane thing to
> do. It violates more rules than I want to even start to think about!
> Telco wires are always connected to lightning arrestors at the
> termination of the long run. (This is NOT always the same as the
> demarc!) MGN is MANDITORY. This is not a do-it-yourself project.

I was unclear. I meant that do-it-yourself utility pole installations
were an insane idea. Telcos do deal with this routinely.

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: Phone: +1 510 486-8634

On Wed, 10 Apr 2002, a half-million replies were made to this thread:

Date: Wed, 10 Apr 2002 15:03:00 -0700
From: half of the nanog list <>
To: "Christopher K. Neitzert" <>,
Subject: Re: Sheilded Cat-5E Ground Loop - Myth or Reality?

Thanks NANOG!

Although some of these replies go way above my need on the physical layer,
this has been most educational and informative.

best wishes


Christopher K. Neitzert / 0xC10D222F /
director, network operations \ redundant networks /