Re: 802.11b coverage in industrial plants


"Spehro Pefhany" <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:9q5ts1ddbhekg9fgajj8tl6ecus0jfpubp@xxxxxxxxxx
> On Wed, 18 Jan 2006 11:41:45 -0700, the renowned "SQLit"
> <sqlit@xxxxxxxxx> wrote:
>
> >
> >"Spehro Pefhany" <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> >news:c1lss1h51j7g7q10mg1ak96knj9m6d9v57@xxxxxxxxxx
> >>
> >> Is it currently practical or even common to have complete 802.11b
> >> coverage within a fairly large plant (say 20-30 acres)? Would that
> >> typically allow operation of a handheld device such as a Wifi capable
> >> PC everywhere throughout the plant?
> >>
> >> Any pointers, data points, etc. would be helpful.
> >>
> >>
> >> Best regards,
> >> Spehro Pefhany
> >> --
> >
> >You need to define what you doing first. The structure will have a lot
to
> >do with the placement of the nodes.
>
> Ideally, something like a laptop or Wifi PDA would be able to maintain
> contact throughout the entire plant. It's not as time critical as,
> say, VOIP, if the data link drops out for a few seconds and comes
> back, I think it will be okay.
>
> >Security is a big deal with these. Define your security, with the IT,
before
> >you jump into this. I personally would not be looking at B more like G.
>
> There doesn't seem to be much downside to g. I do have a world-class
> security expert at hand, however it isn't a big deal for my part of
> this system. It's just monitoring, not controlling, and the
> consequences of a clever foe spoofing the data would not be very
> serious. OTOH, if the company has other ideas of what to do with their
> network, I may be forced to comply with their security measures,
> meaning SSL or something like that.
>
> >I went to a free class by Fluke on their new network sniffer. Instead of
30
> >in the class there were only 10 of us. We got the instructor to connect
the
> >sniffer up to his WiFi and we found 4 wireless networks from inside the
> >conference room. 2 were completely open.
>
> Yes, I just was poking around with my wi-fi PDA at a coffee shop and
> found two deliberate paid access points and several others. At least
> one (at a nearby business) was completely open. I don't imagine
> there's much downside from their pov-- so I borrow a bit of bandwidth,
> big deal.

I used to work for Eaton, they were converting all of the US offices to
wireless. Our office just did not have the band width that it should. I was
close to the router so I ran an cable to my desk.
The guru came out and was making improvements when he walked out side for a
smoke. I went out to ask him a question. His lap top's sniffer program
showed 80% signal strength on the propertly line. I asked him if that was a
good idea. A month later all offices were ordered back to wire.

In this day and age if someone "borrowed" some band width from me, I would
be getting visits from GWB's boys in black.

A closed no internet access system for monitoring might be the way to go.

I know they are out to get me...




.

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