802.11b/g - 3-Channel Plan vs. 4-Channel Plan

Aruba Employee

Product and Software:  This article applies to all Aruba controllers and ArubaOS versions.

 

IEEE 802.11b/g defined 14 2.4 GHz channels, and each channel is only 5 MHz wide. The Aruba controller default configuration defined three nonoverlapping channels, 1, 6, and 11, as valid channels.

 

In some networks environment, using a plan with four channels is more desirable. If the allowed channels are from 1 to 11, the recommended channels are channel 1, 4, 8, and 11. In countries that allow channels from 1 to 13, configure channels 1, 5, 9, and 13 as valid channels.

 

When more nonoverlapping channels are used, the adjacent channel interference is higher and thus the peak performance per channel is lower.

 

Different countries allow different channel usage.  For example, in the US the allowed channel are from 1 to 11, and in France the allowed channels are from 1 to 13.

 

On the controller, use the following command to determine which channels are allowed in your country:

 

ArubaOS 3.x 
show ap allowed-channels country-code <code>

 

Example: 
(Lab)# show ap allowed-channels country-code fr

Allowed Channels for Country Code "FR" 
-------------------------------------- 
PHY Type           Allowed Channels 
--------           ---------------- 
802.11g (indoor)   1 2 3 4 5 6 7 8 9 10 11 12 13 
802.11a (indoor)   36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 
802.11g (outdoor)  1 2 3 4 5 6 7 8 9 10 11 12 13 
802.11a (outdoor)  100 104 108 112 116 120 124 128 132 136 140

 

ArubaOS 2.5.x 
(Lab)# show ap allowed-channels 
CHANNEL LIST 
------------ 
PHY-TYPE           CHANNEL LIST 
--------           ------------ 
802.11g            1 2 3 4 5 6 7 8 9 10 11 
802.11a            36 40 44 48 52 56 60 64 149 153 157 161 165 
802.11g (outdoor)  1 2 3 4 5 6 7 8 9 10 11 
802.11a (outdoor)  52 56 60 64 149 153 157 161

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Last update:
‎06-03-2014 04:17 PM
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