[beowulf0208]

Вот что написано в файле справки к данным настройкам (жаль что на английском и мало что понятно после перевода):

Select Country Region:

2.4 GHz (or 5 GHz): This indicates the 'Wireless Mode' selected in the previous Network Settings screen. From the drop-down list, select the appropriate code for your region. For more information on the channels available for each region, see the Country Channel List.

Channel: Leave at its default value, or if interference is a problem on your network, choose a channel which experiences less interference. If you select Enable 40 MHz Bandwidth', choose a channel with minimal interference on the four channels adjacent to your selected channel.

Enable 40 MHz Bandwidth: Select this option to increase the bandwidth available for your wireless connection. This function works by incorporating the bandwidth available on the four channels adjacent to your selected channel. This option is only supported by IEEE 802.11n devices. If a computer or device connected to the AP does not support this function, bandwidth is reduced to its default level.