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Refer to Radio frequency barriers and RF interference on page 15 for detailed information about RF barriers and interference.
To allow multiple separate wireless networks in a shared and confined space, the RF medium is divided into channels. For devices
in the 5 GHz range (802.11a/n/ac), this means the possibility of up to 23 discrete channels.
For devices using the 2.4 GHz range (802.11b/g/n), the wireless space is limited to a maximum of 14 overlapping channels. As a
result of these overlapping channels, 2.4 GHz technology provides only a total of three discrete channels.
802.11 comparison chart
802.11 signal characteristics
# of Channels in USA
# of Channels in EU
# of Channels in Japan
Frequency Band
Max. Data Rate
Radius (Range)
NOTE: Although 802.11b/g/n standards provide between 11 and 14 channels, only three of those channels are fully discrete
(non‐overlapping) channels.
8
SonicWall SonicPoint ACi Getting Started Guide
802.11a
802.11b
23
11
23
13
15
14
5 GHz
2.4 GHz
54 Mbps
11 Mbps
90ft/25m
120ft/35m
802.11g
802.11n
11
11
13
13
14
14
2.4 GHz
2.4/5 GHz
54 Mbps
450 Mbps (For
3X3 MIMO)
120ft/35m
300ft/90m
802.11ac
21
16
19
5 GHz
1.3 Gbps (For QAM‐
64, MIMO 3X3, and
80 MHz channels)
120ft/35m
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