802.11b/g

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

See also 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 IEEE Std 802.11a-1999, starting on page 25.


[CategoryDocumentation]

ChannelFrequencyChart (last edited 2007-11-23 18:01:28 by localhost)