2003 – Speed 54Mbit – Operates in 2.4 Ghz band – One can have 3 non overlapping channels (channel 1, 6 and 11)
2009 – Up to speeds of 300 Mbit – Operates in 2.4 Ghz and 5 Ghz band
If 2.4 Ghz used still have 3 non overlapping channels (channel 1, 6 and 11)
If 5 Ghz used still have 23 non overlapping channels
The n draft uses the MIMO technique, this means that the normal 20Mhz (150Mbps) channel is doubled to 40 Mhz (300Mbps). This doesn’t mean that you’ll have 2 times the number of non overlapping channels. It assures twice the data transfer rate due to multiple antennas on your access points.
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