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Wireless Channel Selection
IEEE 802.11 wireless nodes communicate with each other using radio frequency signals in the ISM
(Industrial, Scientific, and Medical) band between 2.4Ghz and 2.5Ghz. Neighboring channels are 5Mhz
apart. However, due to spread spectrum effect of the signals, a node sending signals using a particular
channel will utilize frequency spectrum12.5Mhz above and below the center channel frequency. As a
result, two separate wireless networks using neighboring channels (for example, channel 1 and channel 2)
in the same general vicinity will interfere with each other. Applying two channels that allow the maximum
channel separation will decrease the amount of channel cross-talk, and provide a noticeable performance
increase over networks with minimal channel separation
Channel
1
2
3
4
5
6
7
8
9
10
11
12
13
Note: The available channels supported by the wireless products in various countries are
different.
The preferred channel separation between the channels in neighboring wireless networks is 25 MHz (5
channels). This means that you can apply up to three different channels within your wireless network.
There are only 11 usable wireless channels in the United States. It is recommended that you start using
channel 1 and grow to use channel 6, and 11 when necessary.
Center Frequency
2412Mhz
2417Mhz
2422Mhz
2427Mhz
2432Mhz
2437Mhz
2442Mhz
2447Mhz
2452Mhz
2457Mhz
2462Mhz
2467Mhz
2472Mhz
4
Frequency Spread
2399.5Mhz – 2424.5Mhz
2404.5Mhz – 2429.5Mhz
2409.5Mhz –2434.5Mhz
2414.5Mhz –2439.5Mhz
2419.5Mhz – 2444.5Mhz
2424.5Mhz –2449.5Mhz
2429.5Mhz –2454.5Mhz
2434.5Mhz – 2459.5Mhz
2439.5Mhz –2464.5Mhz
2444.5Mhz –2469.5Mhz
2449.5Mhz – 2474.5Mhz
2454.5Mhz – 2479.5Mhz
2459.5Mhz – 2484.5Mhz
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