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WiFi setup, b/g/n, bridges, rouming, etc.

B/G/N

You can find detailed description in http://en.wikipedia.org/wiki/IEEE_802.11. Brief practical info:

B, IEEE 802.11b - up to 11 marketing Mbit/s, rather old standard, uses 2.4 GHz. Real transfer rate ~5 Mbit/s duplex. Accepts about 10 clients in Access Point mode without significant transfer rate degrade. There are 13 frequency-divided channels available.

G, IEEE 802.11g - up to 54 marketing Mbit/s, was the most popular standars for a long time, also uses 2.4 GHz. Real transfer rate is about 21 Mbit/s duplex (2.1Mb/s). Accepts about 20-30 clients in Access Point mode without significant transfer rate degrade. Estimated transfer rate in such case is about 0.5 Mbit/s per client. We should take into account that we use shared media and packet collisions may occure (like on 10 MBit/s ethernet). Performance degrade is non-linear. Also, the most close clients have priority. There are 13 frequency-divided channels available. Actially, these channels are overlapping. Independent chanels (non-overlapped) are 1,6,11. Or 4 and 10. There must be distance of 6 between channels to avoid interference. Some devices support 14th channel far beyond 13th, which doesn't overlap 11th channel and lower ones. Note, most Apple devices doesn't support 12th and 13th channels.

G-turbo, Super-G - Sorry, In Russian only yet.

Mixed mode

Standard channels

2.4 GHz b/g/n
ChannelFrequency, kHzComment
12412 
22417
32422
42427
52432
62437
72442
82447
92452
102457
112462
122467 (unsupported by Mac/Apple)
132472 (unsupported by Mac/Apple)
142484 non-standard
5 GHz a/n
365180 
405200
445220
485240

2013.09.08

See also:




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