802.11n 20/40 MHz BSS Mode Operation
The 802.11n gives us 20/40 MHz BSS mode, which my Apple Extreme Basestation supports in the 5 GHz band. Oh, can't you feel the joy welling up inside you at the thoughts of this? First, let's get some definitions out of the way.
20/40 MHz Operation:
The following terms are used to describe transmitted PPDU formats:
"40 MHz HT" is a Clause 20 transmission using HT Mixed Mode Format (HT_MF) or HT Greenfield Format (HT_GF) frame formats and 40 MHz channel bandwidth
"20 MHz HT" is a Clause 20 transmission using HT Mixed Mode Format (HT_MF) or HT Greenfield Format (HT_GF) frame formats and 20 MHz channel bandwidth
"DSSS/CCK" is a Clause 15 or Clause 18 transmission
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