Edimax BR-6224n Usre Manual page 53

Field
BandWidth
Guard Interval
MCS
Reverse Direction
Grant(RDG)
Extension
Channel
Aggregation
MSDU
(A-MSDU)
bandwidth is 20/40.
You may select Long or Auto. The default guard
interval is Auto.
You may select the MCS value from 0 to 32. The
default MCS is Auto.
You may select Disable or Enable. The default
RDG setting is Enable.
Select a proper channel in the drop down list.
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 the primary bandwidth, the
other is the secondary bandwidth. When data is
being transmitted, it can act as 40MHz bandwidth,
and it can also acts as 20 MHz bandwidth
independently. In this way, the data rate is doubled.
Enable or disable A-MSDU.
MSDU is the aggregation of multiple MSDUs by
using certain method and the multiple MSDUs forms
a greater load. MSDU can be considered as
Ethernet message. Usually, when AP or wireless
client receives MSDUs from protocol stack, the
MSDUs will be marked with the Ethernet message
header (also called A-MSDU Subframes). Before
sending them out, the A-MSDU Subframes need to
be transformed into the message format of 802.11
one by one.
A-MSDU aggregates multiple A-MSDU Subframes
47
Description