=== 802.11b/g ===

From
http://www.qsl.net/n9zia/dsss-channels.html

See also BcWireless:ChannelList where this has already been documented.

USA/FCC & Canada regions have 11 total channels allocated.
All frequencies are in GHz.

||Channel||Lower Frequency||Central Frequency||Upper Frequency||
||1||2.401||2.412||2.423||
||2||2.404||2.417||2.428||
||3||2.411||2.422||2.433||
||4||2.416||2.427||2.438||
||5||2.421||2.432||2.443||
||6||2.426||2.437||2.448||
||7||2.431||2.442||2.453||
||8||2.436||2.447||2.458||
||9||2.441||2.452||2.463||
||10||2.446||2.457||2.468||
||11||2.451||2.462||2.473||

[[http://www.personaltelco.net/~caleb/diagrams/802.11bgchannels.jpg]]

1,6,11 are the optimal non-overlapping channels. Any channels seperated by at least 5 don't overlap, so if someone is using 3 in a given area, 8 would be the next available non-interfering channel.

=== 802.11.a ===

For 802.11a, there are 12 non-interfering channels.  These are numbered in 5 MHz intervals, so the channel numbers hop by 4s. 

||Channel||Frequency||
||36||5.180||
||40||5.200||
||44||5.220||
||48||5.240||
||52||5.260||
||56||5.280||
||60||5.300||
||64||5.320||
||149||5.745||
||153||5.765||
||157||5.785||
||161||5.805||
||165||5.825||

These channels are within the "U-NII Band" and are further seperated into three classes:

||Frequency Range||Description||
||5.15 - 5.25||"Low", max power 50mW, in-building use only, antenna must be integrated||
||5.25 - 5.35||"Middle", max power 250mW||
||5.725 - 5.825||"High", max power 1W, for point-to-point outdoor connections||

These classes are defined by the FCC in CFR 47 Part 15 sections 15.205, 15.209, and (Subpart E) 15.401-15.407.  You can find this document online if you poke around.

Also, these classes are similarly described in [[http://standards.ieee.org/getieee802/download/802.11a-1999.pdf|IEEE Std 802.11a-1999]], starting on page 25.


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[CategoryDocumentation]