802.11n Radio Frequency

Under 802.11n radio (2.4GHz), it use 20MHz and the recommended overlapped channel is 1, 6 ,11.

Does it also apply for 802.11n (5GHz) 40MHz ?
AXISHKAsked:
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Muhammad BurhanManager I.T.Commented:
1, 6, 11 are for 802.11n 2.4ghz.

5 GHz also have overlapping channels
please consider
http://www.macworld.com/article/1140685/wifi_spectrumbands.html
Craig BeckCommented:
Standard 20MHz-wide 5GHz channels don't overlap.  They are 5MHz-wide by default with 15MHz of spacing.

Technically 40MHz-wide channels don't overlap either, but if you set different primary and secondary channel schemes they could overlap across different APs.
AXISHKAuthor Commented:
Want to understand more for 5GHz, what channels are available ? Which channel doesn't overlapped (and hence  I should consider them first)

Tks again ?
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Craig BeckCommented:
Generally 5GHz gives you 36 to 48.  That's 36, 40, 44 and 48.  They're the UNII-1 band.  They're for use indoors only.  However, there are different regulatory domains which allow the use of sub-channels and/or different channels.

None of the UNII-1 channels overlap if used in the major territories (North America, Europe or Japan).  Japan is a bit of a special case in that you can use 10MHz channel-widths on some channels (not UNII bands though).

You also have bands UNII-2, UNII-2e and UNII-3.

UNII-2 allows for channels 52-64 (52, 56, 60, 64).

UNII-2e allows for some 'extended' channels from within the UNII-2 band for use in some regulatory domains.  Some channels can be used in Europe, for example, which can't be used in North America.

UNII-3 allows for channels to be used externally for light-licensed point-to-point links but also allows for indoor use.

There are restrictions on transmit power and channel selection too.  Some channels must be used with DFS only in order to adhere to RADAR stipulations, etc.

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AXISHKAuthor Commented:
Interesting for 5GHz. Is there any spectrum used by 5Ghz for my information ?

Tks
Craig BeckCommented:
The original question was answered.  The close request is in relation to a subsequent question which received no feedback.
AXISHKAuthor Commented:
Thx
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