Description of 802.11n standard that is not released yet.

802.11n is not released yet. It is a still a draft. Backward compatibility will be for sure, at least with 802.11a/g.

The story begins in the 2004 when IEEE formed a new task group to develop a new amendment to 802.11. Data throughput is estimated to theoretical 540 Mbps. New standard is build on previous 802.11 standards by adding MIMO (multiple-input multiple-output). MIMO have a multiple transmitter and receiver antennas which allow increased data bandwidth via spatial multiplexing and increased range by exploiting the spatial diversity.

Frequency will be available in 2 bands: 2.4 and 5 GHz. Indoor range of should be 50 meters (167 feet) and outdoor should be 125 meters (417 feet).

I said that standard is not release yet, but there are already vendors with devices equipped with that technology. Most new MAC computers use it, Dell, Acer laptops also have built in the 11n wireless cards. Samsung set-top boxes use a new standard chipset. Linksys have wireless routers. Lots of vendors want to take the piece of cake of that new wireless standard.