Ten Facts About 802.11n

This will be a 5 day post with two facts a day about the new WLAN specification, 802.11n.  So keep reading until we get through all 10 facts.

Fact #1

802.11n is dual band, so it operates in either 2.4GHz or 5GHz band.  Although some embedded or mini PCI adapters can work in either band, most 802.11n clients based on CardBus or ExpressCard use the 2.4GHz band.  Yet recent changes by regulatory agencies have opened up the 5MHz band throughout much of the world.

Fact #2

802.11n uses both 20MHz and 40MHz channels.  The use of 40MHZ mode is not recommended for the 2.4GHz band because the band will suffer from interference caused by the transmitter.  Therefore, 40MHz channels should be used in the 5GHz band.  Because there are significantly more channels in the 5GHz band, deployment of an 802.11n network will be easier even while operating in the 40MHz channel.

Don’t forget to look for Facts #3 and #4 on Monday.