From: Nick Mackovski (nick.mackovski@rogers.com)
Date: Tue Mar 04 2003 - 00:47:19 GMT-3
Fadil,
If you configure your AP on channel 11, your wireless adapters will also
use channel 11. You can use ACU to verify this - select "Status".
The centre frequency for channel 11 is 2462MHz with a channel bandwidth
of 22MHz. Because of this, 802.11b only offers 3 non-overlapping,
non-interfering channels. (channels 1, 6, 11 for North America)
Cisco Aironet APs (802.11b) use three different types of modulation,
depending on the data rate used:
11Mbps - CCK
5.5Mbps - CCK
2Mbps - QPSK
1Mbps - BPSK
For a large site WLAN solution, the most important component is a
professional site survey. Without it, you are asking for problems.
Designing wireless LANs (type of antenna and placement) is more art than
science.
If you deploy Cisco Aironet APs with static WEP, enable MIC and TKIP.
MIC helps prevents bit-flip attacks and TKIP (WEP key hashing) protects
by hashing the IV on a per-packet basis.
Good luck with your project.
cheers,
Nick Mackovski
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Fadil
Sent: March 3, 2003 7:26 PM
To: ccielab@groupstudy.com; Pratt, Jeremy
Subject: Re: Cisco Aironet
Hi,
Thank you very much for your help.The link is really helpful. Can I ask
you
something more?
For example I configure an Aironet to work on channel 11. I want to know
the
frequency on which the clients are operating.. As far as I know , the
frequency for channel 11 is 2462 MHz. If they work on the same frequency
what kind of multiplexing do they use ? Can you explain this to me or
direct me to a useful link about this.
Thanks
Fadil
----- Original Message -----
From: "Pratt, Jeremy" <JPratt@coh.org>
To: "'Fadil'" <fadiltakipte@hotmail.com>; <ccielab@groupstudy.com>
Sent: Monday, March 03, 2003 1:40 PM
Subject: RE: Cisco Aironet
> Here's the link showing the max recommendation is 25 per A/P.
>
>
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns178/c649/ccmig
rati
> on_09186a00800d67eb.pdf
>
> Go to the bottom of page 31.
>
> -----Original Message-----
> From: Pratt, Jeremy
> Sent: Monday, March 03, 2003 1:36 PM
> To: 'Fadil'; ccielab@groupstudy.com
> Subject: RE: Cisco Aironet
>
>
> My wireless is setup for a max associations of 25 per A/P. This is
based
> on
> my SE's recommendation and makes sense to me based on the 11 mbps max
> bandwidth.
>
> -----Original Message-----
> From: Mike Williams [mailto:ccie2be@swbell.net]
> Sent: Friday, February 28, 2003 11:34 PM
> To: 'Fadil'; ccielab@groupstudy.com
> Subject: RE: Cisco Aironet
>
>
> IIRC, Cisco's 1200s can handle up to 255 (I know it's between
250-255).
> However, since all users associated with a single AP are effectively
> sharing bandwidth, etc, that would be like having 250+ people sharing
a
> single 10Mbps hub! That's ugly. I would highly recommend using more
> APs, preferrably enough that you have no more than 100 users per AP.
> Probably not what you want to hear, but there is NO WAY I'd support an
> AP with 500 people using it (I'd hate to be working in a place where
> 500+ people were within reach of a single AP =)
>
> Having said that, if you setup 3 APs each on their own frequency (1,
6,
> 11), then that would at least spread the burden around so that (in
> theory if they split evenly) you'd get 500/3 or ~167 users per AP. I
> would get more APs, spread them out, and even tweak the power of each
AP
> so that I could have less than 100 people per AP (personally, I
wouldn't
> want more than 50+ people on a single AP at any given time, but that's
> me)
>
> Mike W.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Fadil
> Sent: Friday, February 28, 2003 11:27 PM
> To: ccielab@groupstudy.com
> Subject: Cisco Aironet
>
>
> Hi Group,
>
> Sorry for the off topic question.
> How many users can an aironet access point support ?For example if I
> have 500 users and all in one location how many aironets do I have to
> use (All in different channels but at the same location)?
>
> Thanks in advance
>
> Fadil
>
>
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