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IEEE 802.11a Channels
The 802.11a specification today specifies four channels for the UNII1 band, four channels for the UNII2 band, and
four channels for the UNII3 band. These channels are spaced at 20 MHz apart and are considered noninterfering;
however, they do have a slight overlap in frequency spectrum. It is possible to use adjacent channels in adjacent
cell coverage, but it is recommended when possible to separate adjacent cell channels by at least 1 channel.
Figure 10 shows the channel scheme for the 802.11 bands, and Table 5 lists the North American frequency
allocations.
Figure 10. 802.11a Channel Allocation
Table 5. 802.11a Frequency Plan
●
UNII lower band
●
5.15-5.25 GHz
●
5.180 GHz
●
5.200 GHz
●
5.220 GHz
●
5.240 GHz
●
UNII middle + extended
●
5.25-5.700 GHz
●
52
●
56
●
60
●
64
●
100
●
104
●
108
●
112
●
116
●
120
*
●
124
*
●
128
*
●
132
●
136
●
140
●
5.260 GHz
●
5.280 GHz
●
5.300 GHz
●
5.320 GHz
●
5.500 GHz
●
5.520 GHz
●
5.540 GHz
●
5.560 GHz
●
5.580 GHz
●
5.600 GHz
●
5.620 GHz
●
5.640 GHz
●
5.660 GHz
●
5.680 GHz
●
5.700 GHz
●
UNII upper band
●
5.725-5.825 GHz
●
5.745 GHz
●
5.765 GHz
●
5.785 GHz
●
5.805 GHz
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