Cisco Aironet 1520 Series Manuel d'utilisateur télécharger pdf (Page 15)

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

Regulatory Domain Frequency Band Channel Number Centre Frequencies

USA

●

UNII lower band

●

5.15-5.25 GHz

●

5.180 GHz

●

5.200 GHz

●

5.220 GHz

●

5.240 GHz

USA

●

UNII middle + extended

●

5.25-5.700 GHz

●

100

●

104

●

108

●

112

●

116

●

120

●

124

●

128

●

132

●

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

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 72 73

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Cisco Aironet 1520 Series Manuel d'utilisateur Page 15

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