[c-nsp] Re: Question about Cisco AIR-AP 1200 series access point?

[r.sahney]

Hi All,

       1     Simple and sweet is Cisco recommends about 20 - 24 users
for optimium performance per AP.
        2     There should be only about 10 - 12 % area for ovelapping
channels so that the connection is not lost in case of movement, hence
seamless movement.
              
3 Check around for wiring , thick glass, pillars or other reflecting
or refracting things.

4 Since this will be in bound deployment , try and reduce the AP
Transmit power to abt 30 mW, and on Cards to about 5 - 10 mW.

5 Also let me know what antennas u have , i will let u know the right
design as well. :-) .........

Regards
Raj

"Easiest way to grow is ,help others"

 



On Fri, 11 Feb 2005 13:30:49 +0000, Ryan O'Connell
<ryan at complicity.co.uk> wrote:
> On 11/02/2005 11:42, jordi wrote:
> 
> >I am not sure How many users can be supported concurrently? I am working on a project with more than 100 people in one floor. How many APs should be needed?
> >
> 
> For 100 people on 802.11b/g, you will need quite a few APs if you want
> to come even close to reasonable office performance. With that many
> users, personally I'd be looking somewhere in the region of at least 5
> APs - ideally 802.11g - but so much depends on local conditions (E.g.
> lift shafts can cause reception blackspots, IT staff tend to use more
> bandwidth than a receptionist...) that it's hard to give a definitive
> answer.
> 
> Assuming you're in China as your signature suggests, you'll have 11 or
> 13 channels available to you but they overlap so you can only use 3 at
> once - 1, 6 and 11 - so installing three APs is quite easy. Beyond that,
> you need to start thinking very carefully about the local layout - if
> people are spread out over a large area, you can put radios on the same
> frequency at opposite ends of the area. 100-200m between radios on the
> same frequency in an office area is a good rule of thumb if you're using
> 50mW TX power and an omni aerial. You *could* squeeze in more APs by
> reducing the TX power on them, but unless you can guarantee that the
> clients will also run at a reduced power you'll run into lots of
> interference problems.
> 
> 802.11a has more channels available so it's much eaiser to do things
> such as you describe - however, the range of 802.11a is shorter so more
> APs may be needed.
> 
> When working out bandwidth, don't forget it's a shared medium like
> unswitched Ethernet, so you'll never see annywhere close to 11Mb/s from
> 802.11b. You can get anything from 2Mb/s up to about 5Mb/s depending on
> the quality of the equipment - Cisco-to-Cisco generally gives the best
> performance.
> 
> --
>         Ryan O'Connell - CCIE #8174
> <ryan at complicity.co.uk> - http://www.complicity.co.uk
> 
> I'm not losing my mind, no I'm not changing my lines,
> I'm just learning new things with the passage of time
> 
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