When co-locating APs for user density/capacity, they should be on
non-overlapping channels (1/6/11 for 802.11b/g) and should be spaced
some distance (3 feet is a good rule of thumb) apart from one another.
This applies to both 802.11b/g and 802.11a.
The reason you want to do this is to minimize interference between APs.
Even though the APs are on non-overlapping channels, there is a small
amount of RF energy that does overlap and interfere. By physically
separating the APs, this interference is reduced (by free-space loss) to
a tolerable/negligible amount. 3 feet gives about 40 dB of free-space
loss at 2.4 GHz to "assist" the guard band separation between channels.
>>-> Stan Brooks - CWNA/CWSP
Emory University
Network Communications Division
-------- Original Message --------
From: Rick Brown
Date: 3/27/2006 4:51 PM
We are using Cisco 1240 series AP's. I seem to remember
an instructor for Terrawave saying that when clustering AP's
for user density to space them approximately 3 ft a part.
I don't remember if the recommendation applied to 802.11G
or to 802.11A. Does anyone remember any such recommendations?
Example: AP 1 < 3ft >
AP2
3ft 3ft
AP 3 < 3ft >
AP4
Thanks!
Rick
--
Richard E.(Rick) Brown (919) 515-5489 office
Network Systems Engineer (919) 515-1641 fax
Communication Technologies email: [EMAIL PROTECTED]
N.C. State University
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