From: pauls at utdallas.edu (Paul Schmehl)
Subject: WiFi question

--On Monday, November 22, 2004 02:26:35 AM +0100 Ake Nordin 
<rootmoose@...ia.com> wrote:
>
> This (the preamble especially) is what _should_ eliminate
> the motion sensors from the list. I'm out on this one (too
> lazy to do the math), but is the 802.11b air interface that
> resilient (does it really require that much redundancy)? It
> should be, but that would also be some lost (usable)
> bandwidth.
>
Agreed, and I'd like to see more discussion of that aspect from 
knowledgeable people.
>
> Sorry.
>
> 1) The building will contain very much of that energy
> (which never was very much on a metropolitan scale, FCC Part
> 15 and all that).
>
> 2) The noise characteristics as received by those services
> would be intermittent, very bursty and come from many
> different directions all over the city. No easy clues telling
> what to complain about there.
>
> 3) I don't know about US emergency communication radios, but
> typical European systems (before Terrestrial Trunked Radio)
> are so bad anyway that this contributed noise hardly would
> be noticed.

You may well be right, but keep in mind that the campus police would be 
operating *in and around* those building much of the time, so they might 
actually be affected by it, *if* thats possible.

I'm still not convinced that, more than a few feet from a device, the 
interference would even be detectable.

Paul Schmehl (pauls@...allas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu

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