https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401176#M10918 <P>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 <A href="http://en.wikipedia.org/wiki/IEEE_802.11h-2003">http://en.wikipedia.org/wiki/IEEE_802.11h-2003</A> <A href="http://en.wikipedia.org/wiki/IEEE_802.11h-2003">http://en.wikipedia.org/wiki/IEEE_802.11h-2003</A> and <A href="http://en.wikipedia.org/wiki/List_of_WLAN_channels#">http://en.wikipedia.org/wiki/List_of_WLAN_channels#</A> 5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.29 <A href="http://en.wikipedia.org/wiki/List_of_WLAN_channels#">http://en.wikipedia.org/wiki/List_of_WLAN_channels#</A> 5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.29</P> Tue, 10 Aug 2010 19:35:49 GMT GARRY_W_Intel 2010-08-10T19:35:49Z https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401175#M10917 <P>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?</P> Sat, 17 Jul 2010 15:39:01 GMT https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401175#M10917 idata 2010-07-17T15:39:01Z https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401176#M10918 <P>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 <A href="http://en.wikipedia.org/wiki/IEEE_802.11h-2003">http://en.wikipedia.org/wiki/IEEE_802.11h-2003</A> <A href="http://en.wikipedia.org/wiki/IEEE_802.11h-2003">http://en.wikipedia.org/wiki/IEEE_802.11h-2003</A> and <A href="http://en.wikipedia.org/wiki/List_of_WLAN_channels#">http://en.wikipedia.org/wiki/List_of_WLAN_channels#</A> 5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.29 <A href="http://en.wikipedia.org/wiki/List_of_WLAN_channels#">http://en.wikipedia.org/wiki/List_of_WLAN_channels#</A> 5.C2.A0GHz_.28802.11a.2Fh.2Fj.2Fn.29</P> Tue, 10 Aug 2010 19:35:49 GMT https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401176#M10918 GARRY_W_Intel 2010-08-10T19:35:49Z https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401177#M10919 <P>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.</P><P></P><P>All Intel 11n wireless adapters support 40 Mhz connection at the channel combination mentioned above.</P> Thu, 19 Aug 2010 08:28:27 GMT https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401177#M10919 idata 2010-08-19T08:28:27Z https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401178#M10920 <P>So, boil down to the bottom, why regulatory think 153+1, 157-1 is illegal? I don't think this is caused by hardware. </P> Sun, 15 May 2011 02:55:10 GMT https://community.intel.com/t5/Wireless/why-153-157-are-not-allowed-to-bind-as-a-40MHz-channel-for-intel/m-p/401178#M10920 idata 2011-05-15T02:55:10Z