Channels in the 5-GHz U-NII Bands
Recall that the 5-GHz band is organized as four separate, smaller bands: U-NII-1, U-NII-2, U-NII-2 Extended, and U-NII-3. The bands are all divided into channels that are 20 MHz apart, as listed in Table 2-6.
Table 2-6 IEEE 802.11 Channel Layout in the 5-GHz Bands
The fact that the 5-GHz space is divided into four different bands might seem confusing. Even worse is the channel numbering. For instance, why is the first channel in the U-NII-1 band called channel 36 instead of channel 1? And why are neighboring channels actually four channel numbers apart?
The answers lie in the 802.11 standard itself: The entire ...
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