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Intel only support {149, 153}, {157,161} to bind as a 40MHz channel. Is this a protocol requirement or just for intel's cards. If this comes from 11 protocol, which part made such confinement?
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Not sure which country you are in but in the 5GHZ spectrum not all channels are available in a given country. Part of the 802.11a/n 5GHz spectrum overlaps with radar and therefor the channles avaialble depend on the country you are located in. See http://en.wikipedia.org/wiki/IEEE_802.11h-2003 http://en.wikipedia.org/wiki/IEEE_802.11h-2003 and http://en.wikipedia.org/wiki/List_of_WLAN_channels# 5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.29 http://en.wikipedia.org/wiki/List_of_WLAN_channels# 5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.29
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According to the specs you can connect on 40 Mhz channels:149+1, 153-1, 157+1,161-1 (where +1 means above and -1 means below). No other combinations are allowed based on the specs.
All Intel 11n wireless adapters support 40 Mhz connection at the channel combination mentioned above.
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So, boil down to the bottom, why regulatory think 153+1, 157-1 is illegal? I don't think this is caused by hardware.
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