User Manual

www.moxa.com [e-mail] 14
2009 Industrial Wireless Guidebook
Understanding Industrial WLAN – IEEE 802.11
2
2.4 GHz ISM Band
As 802.11b/g is the most commonly used WLAN standard today, the 2.4 GHz ISM band is supported by
almost every country worldwide. Not every country supports the same channels in the 2.4 GHz ISM band,
so you need to make sure the wireless AP matches the standard used by your country. The following chart
shows channels supported in the 2.4 GHz ISM band for different countries/continents.
Channel Number Center Frequency USA EU, M. East, Asia Japan
1 2.412 Y Y Y
2 2.417 Y Y Y
3 2.422 Y Y Y
4 2.427 Y Y Y
5 2.432 Y Y Y
6 2.437 Y Y Y
7 2.442 Y Y Y
8 2.447 Y Y Y
9 2.452 Y Y Y
10 2.457 Y Y Y
11 2.462 Y Y Y
12 2.462 Y Y
13 2.472 Y Y
14 2.484 Y
*DSSS only
The FCC opened the frequency band between 2.4 to 2.5 GHz, and the IEEE uses 2.400 to 2.4835 GHz. The
minor mismatch is to provide a buffer to prevent power from leaking into the forbidden band.