Edimax Technology HP-2002APn - Manual (Page 31)

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HT Physical Mode
The parameters of HT Physical Mode are described as follows:
Field Description
Operation
Mode
You may select Mixed Mode or Green Field. The default
operation mode is Mixed Mode.
Channel
BandWidth
You may select 20 or 20/40. The default channel
bandwidth is 20/40.
Guard
Interval
You may select Long or Auto. The default guard interval
is Auto.
MCS You may select the MCS value from 0 to 32. The default
MCS is Auto.
Reverse
Direction
Grant
(RDG)
You may select Disable or Enable. The default RDG
setting is Enable.
Extension
Channel
When the channel bandwidth is set to be 20/40 MHz, the
extension channel will provide a channel that is adjacent
to the primary channel but not overlaps. The wireless
network will acquire diploid bandwidth by this extension
channel, that is, 20MHz bandwidth.
Note: IEEE 802.11n can bind two adjacent 20 MHz
bandwidths together to form a 40MHz bandwidth.
Actually, the 40MHz bandwidth can act as two 20 MHz
bandwidths. One is primary bandwidth, the other is