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2.4 GHz Bandplan

The most common radio frequency band for WiFi use is 2.4 GHz using 802.11g and 802.11n. This band has been divided into 14 channels, each 20 MHz wide, with the centers spaced 5 MHz apart. Channel 1 is centered at 2.412 GHz, therefore Channel 2 is at 2.417 GHz, Channel 3 is at 2.422 GHz, etc. As you can see the only channels that don’t overlap with another channel (when all are in use) are 1, 6 and 11. All others are subject to interferrence with adjacent channels. Special modulation techniques help alleviate this situation.

2.4 GHz Bandplan

Comparison of WiFi protocols

802.11 protocol

Release Date

Frequency (GHz)

Bandwidth (MHz)

Max Data Rate (Megabit/sec)

Approx. Indoor Range

Approx. Outdoor Range

a

Sept 99

5/3.7

20

54

35

120

b

Sept 99

2.4

22

11

35

140

g

June 03

2.4

20

54

38

140

n

Oct 09

2.4/5

20

600

70

250

ac

Sept 13

5

20-160

500-1000

35

The actual data throughput is more like the numbers in Table 2.

802.11x b g n ac
Actual Expected Data Rate (Mbps) 2-3 20 40-50 70-100

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