Quote:
Originally Posted by NCollins
No IEEE 802.11 b/g has 11 channels in the U.S. and Canada. The reason you cannot use them all at once is that adjacent channels overlap this gives you 6 channel that can be run on top of each other. Or sequenced overlap of 1,3,5,7,9,11,2,4,6,8,10 in one dimension.
or
____1
__3___5
7___9___11
__4___2
____6
in two dimensions
|
There are only 3 NON-OVERLAPPING CHANNELS for b/g because the channels are 5 MHz wide and 802.11b/g occupies a little more than 20mhz. The channel number refers to the center frequency. You can use center frequency on channels 1, 6, 11 without mutual interference. Some 802.11n signals are 40 Mhz wide. The channels for 802.11a are 10 mhz wide and every other channel can be used to provide 8 NON-Overlapping channels.
In 802.11b/g in the U.S. you can use any of 11 channels you like as your center frequency but there will be interference with other stations using channels less than 5 from you channel. That is not to say that running say 6 access points on 1, 3, 5, 7, 9, and 11 won't work - they will work but there will be mutual interference, retransmissions, etc.