NETGEAR WPN111 user manual 802.11b/g Wireless Channels

User Manual for the NETGEAR RangeMax™ Wireless USB 2.0 Adapter WPN111

802.11b/g Wireless Channels

IEEE 802.11b/g wireless nodes communicate with each other using radio frequency signals in the ISM (Industrial, Scientific, and Medical) band between 2.4 GHz and 2.5 GHz. Neighboring channels are 5 MHz apart. However, due to spread spectrum effect of the signals, a node sending signals using a particular channel will utilize frequency spectrum 12.5 MHz 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.

The radio frequency channels used in 802.11b/g networks are listed in Table B-1:

Table B-1:	802.11b/g Radio Frequency Channels
Channel	Center Frequency		Frequency Spread
1	2 4 1 2 M H z		2 3 9 9 . 5 M H z - 2 4 2 4 . 5 M H z
2	2 4 1 7	M H z	2 4 04 . 5 M H z - 2 4 2 9 . 5 M H z
3	2 4 2 2 M H z		2 4 09 . 5 M H z - 2 4 3 4 . 5 M H z
4	2 4 2 7	M H z	2 4 1 4 . 5 M H z - 2 4 3 9 . 5 M H z
5	2 4 3 2 M H z		2 4 1 9 . 5 M H z - 2 4 4 4 . 5 M H z
6	2 4 3 7	M H z	2 4 2 4 . 5 M H z - 2 4 4 9 . 5 M H z
7	2 4 4 2 M H z		2 4 2 9 . 5 M H z - 2 4 5 4 . 5 M H z
8	2 4 4 7	M H z	2 4 3 4 . 5 M H z - 2 4 5 9 . 5 M H z
9	2 4 5 2 M H z		2 4 3 9 . 5 M H z - 2 4 6 4 . 5 M H z
1 0	2 4 5 7	M H z	2 4 4 4 . 5 M H z - 2 4 6 9 . 5 M H z
1 1	2 4 6 2 M H z		2 4 4 9 . 5 M H z - 2 4 7 4 . 5 M H z
1 2	2 4 6 7	M H z	2 4 5 4 . 5 M H z - 2 4 7 9 . 5 M H z
1 3	2 4 7 2 M H z		2 4 5 9 . 5 M H z - 2 4 8 4 . 5 M H z
W ire le ss N e tworkin g B a sics				B -3

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