GP-L200N User Manual
26
Field
Description
secondary. When the data is being transmitted, the
channel can act as either 40MHz bandwidth or 20 MHz
bandwidth independently. In this way, the data rate is
doubled.
Aggregation MSDU
(A-MSDU)
Enable or disable A-MSDU.
MSDU is the aggregation of multiple MSDUs by using
certain method and the multiple MSDUs forms a greater
load. The MSDU can be regarded as the Ethernet
message. Usually, when an AP or a wireless client receives
MSDUs from a protocol stack, the MSDUs are marked with
the Ethernet message header (also called A-MSDU
Subframes). Before being sent 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 and
encapsulates them into an 802.11 message. In this way,
PLCP Preamble, PLCP Header, and 802.11 MAC overhead
that are needed to send an 802.11 message decrease. At
the same time, the acknowledge frames also decrease and
the efficiency for sending message is improved.
Auto Block ACK
Enable or disable
Auto Block ACK.
In order to ensure security of the data transmission,
802.11n protocol requires that if a client receives a unicast
frame, the client should immediately send back an ACK
frame. After the receiver of
A-MPDU receives A-MPDU, the
receiver needs to process every MPDU. In that case, the
receiver sends out ACK frames to every MPDU. Block
Acknowledgement is used to reduce the number of the
ACK frames by using an ACK frame.
Decline BA Request
Enable or disable
Decline BA Request.
