[989] in resnet
Re: 802.11b signal ranges
daemon@ATHENA.MIT.EDU (Adam Klemann)
Thu Mar 14 14:20:43 2002
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Message-ID: <5.1.0.14.2.20020314140446.00ab9a40@po.muohio.edu>
Date: Thu, 14 Mar 2002 14:15:59 -0500
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Adam Klemann <klemanma@MUOHIO.EDU>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <FF3B1B94BD00D41185AD00508BC87CEB18317B@sgignt1.cardinalcor p.com>
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Thank you everyone for the input.
I am aware that actual throughput is only around 4-5 Mbps. TCP/IP naturally
backs off the theoretical maximums. Also dealing with network overhead. Do
you have WEP enabled? I understand that without WEP you are looking at
maybe 6-8Mbps.
I hope the FCC isn't reading this or crawling the archives! What is the
maximum signal strength for US? I keep seeing 15dBm is that the same as
15mW? Guess I'll need to break out the HAM radio books. I thought dB had to
do with the antennae gain. Peter Peters commented that he is using base
stations giving out 100mW of signal strength and that it is the maximum for
Europe. Is the hack a firmware upgrade from Europe?
Did you need to apply the hack to the base stations by themselves or the
wireless cards in your client machines too? Just curious.
Thanks,
Adam
At 10:20 AM 3/14/2002 -0600, you wrote:
>No in the private sector, I have used a smattering of 802.11b devices in
>our plant.
>First warning, 11Mbs is very optimistic. Via straight file downloading I
>would put
>it best at 4-5Mbs. If you want that, <100' in a steel building. We have
>found a
>firmware power hack that brought it the WAPs up to 100mW. I can stay
>connected
>up to 300' in the same steel building now.
>
>We run Netgear Wireless Access Points and either linksys cards or Orinocco
>cards.
>Orinocco still makes DOS drivers. :-)
>
>Feel free to reply,
>Shane
>
>
>
>
>-----Original Message-----
>From: Adam Klemann [<mailto:klemanma@MUOHIO.EDU>mailto:klemanma@MUOHIO.EDU]
>Sent: Thursday, March 14, 2002 7:39 AM
>To: RESNET-L@listserv.nd.edu
>Subject: 802.11b signal ranges
>
>Can anyone give me some results of testing your wireless setups? At what
>distance did the raw data transfer rate drop from 11Mbps to 5.5, 2, &
>1Mbps? I have bounced my brain of google and the rest of the Internet a few
>too many times and can't seem to find a straight answer. What I have seen
>repeated over and over is 150ft (30m) but some say this is the indoor range
>and some say this is the range that the signal can still broadcast 11Mbps.
>
>I would like to see the results you got either way but ideally I would like
>to see tests that occurred under about the following circumstances:
>-a COTS (Commercial Off The Shelf) wireless base station (we are using
>Cisco aeronets (and a few Apple Airports spread out here and there), but
>just let me know what you used) Please no antennae!
>-Open air environment without a lot of buildings on either side that the
>signal might bounce off of (I know that this isn't a very real world
>situation but I am interested in a wireless setup's raw transmission
>capability
>-COTS wireless card, just let me know what type of card you used
>
>Thank you very much,
>Adam Klemann
>
>
>M. Adam Klemann
>MCIS Support Desk Analyst
>Miami University
>324 Gaskill Hall
>Office: (513) 529-8536
>
>___________________________________________________
>You are subscribed to the ResNet-L mailing list.
>
>To subscribe, unsubscribe or search the archives,
>go to
><http://LISTSERV.ND.EDU/archives/resnet-l.html>http://LISTSERV.ND.EDU/archives/resnet-l.html
>
>___________________________________________________
M. Adam Klemann
Support Desk Analyst
Miami University
324 Gaskill Hall
Office: (513) 529-8536
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<html>
Thank you everyone for the input.<br><br>
I am aware that actual throughput is only around 4-5 Mbps. TCP/IP
naturally backs off the theoretical maximums. Also dealing with network
overhead. Do you have WEP enabled? I understand that without WEP you are
looking at maybe 6-8Mbps. <br><br>
I hope the FCC isn't reading this or crawling the archives! What is the
maximum signal strength for US? I keep seeing 15dBm is that the same as
15mW? Guess I'll need to break out the HAM radio books. I thought dB had
to do with the antennae gain. Peter Peters commented that he is using
base stations giving out 100mW of signal strength and that it is the
maximum for Europe. Is the hack a firmware upgrade from Europe?<br><br>
Did you need to apply the hack to the base stations by themselves or the
wireless cards in your client machines too? Just curious.<br><br>
Thanks,<br>
Adam<br><br>
At 10:20 AM 3/14/2002 -0600, you wrote:<br><br>
<br>
<blockquote type=cite class=cite cite><font size=2>No in the private
sector, I have used a smattering of 802.11b devices in our plant.</font>
<br>
<font size=2>First warning, 11Mbs is very optimistic. Via straight
file downloading I would put</font> <br>
<font size=2>it best at 4-5Mbs. If you want that, <100' in a
steel building. We have found a </font><br>
<font size=2>firmware power hack that brought it the WAPs up to
100mW. I can stay connected</font> <br>
<font size=2>up to 300' in the same steel building now.</font> <br><br>
<font size=2>We run Netgear Wireless Access Points and either linksys
cards or Orinocco cards.</font> <br>
<font size=2>Orinocco still makes DOS drivers. :-)</font>
<br><br>
<font size=2>Feel free to reply,</font> <br>
<font size=2>Shane</font> <br><br>
<br><br>
<br>
<font size=2>-----Original Message-----</font> <br>
<font size=2>From: Adam Klemann [<a href="mailto:klemanma@MUOHIO.EDU">mailto:klemanma@MUOHIO.EDU</a>]</font> <br>
<font size=2>Sent: Thursday, March 14, 2002 7:39 AM</font> <br>
<font size=2>To: RESNET-L@listserv.nd.edu</font> <br>
<font size=2>Subject: 802.11b signal ranges</font> <br><br>
<font size=2>Can anyone give me some results of testing your wireless setups? At what</font> <br>
<font size=2>distance did the raw data transfer rate drop from 11Mbps to 5.5, 2, &</font> <br>
<font size=2>1Mbps? I have bounced my brain of google and the rest of the Internet a few</font> <br>
<font size=2>too many times and can't seem to find a straight answer. What I have seen</font> <br>
<font size=2>repeated over and over is 150ft (30m) but some say this is the indoor range</font> <br>
<font size=2>and some say this is the range that the signal can still broadcast 11Mbps.</font> <br><br>
<font size=2>I would like to see the results you got either way but ideally I would like</font> <br>
<font size=2>to see tests that occurred under about the following circumstances:</font> <br>
<font size=2>-a COTS (Commercial Off The Shelf) wireless base station (we are using</font> <br>
<font size=2>Cisco aeronets (and a few Apple Airports spread out here and there), but</font> <br>
<font size=2>just let me know what you used) Please no antennae!</font> <br>
<font size=2>-Open air environment without a lot of buildings on either side that the</font> <br>
<font size=2>signal might bounce off of (I know that this isn't a very real world</font> <br>
<font size=2>situation but I am interested in a wireless setup's raw transmission capability</font> <br>
<font size=2>-COTS wireless card, just let me know what type of card you used</font> <br><br>
<font size=2>Thank you very much,</font> <br>
<font size=2>Adam Klemann</font> <br><br>
<br>
<font size=2>M. Adam Klemann</font> <br>
<font size=2>MCIS Support Desk Analyst</font> <br>
<font size=2>Miami University</font> <br>
<font size=2>324 Gaskill Hall</font> <br>
<font size=2>Office: (513) 529-8536</font> <br><br>
<font size=2>___________________________________________________</font> <br>
<font size=2>You are subscribed to the ResNet-L mailing list.</font> <br><br>
<font size=2>To subscribe, unsubscribe or search the archives,</font> <br>
<font size=2>go to <a href="http://LISTSERV.ND.EDU/archives/resnet-l.html">http://LISTSERV.ND.EDU/archives/resnet-l.html</a></font> <br>
<font size=2>___________________________________________________</font> </blockquote>
<x-sigsep><p></x-sigsep>
M. Adam Klemann<br>
Support Desk Analyst<br>
Miami University<br>
324 Gaskill Hall<br>
Office: (513) 529-8536<br>
</html>
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