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DTUS065 rev A.7 – June 27, 2014
Beacon interval:
This option allows configuring the interval between two beacon frames.
Beacons are used by APs, mesh nodes and ad-hoc stations to advertise their
capabilities and settings (HT mode, SSID…) to other devices.
The default settings depend on the 802.11 mode.
If you decrease the Beacon interval you consume more bandwidth on the
channel, and you can decrease the global Wi-Fi performance; but you will
detect connection losses faster.
Fragmentation Threshold:
This option configures the maximum 802.11 frame size in 802.11a/b/g mode
in bytes. Frames that exceed this threshold are fragmented.
RTS/CTS Threshold:
The Wi-Fi standard uses the RTS/CTS protocol to avoid collisions in the air.
This option defines the size of the 802.11 a/b/g frames subject to this
protection. Frame exceeding this size are sent under CTS/RTS protocol.
Use CTS/RTS when you have much interference on your channel and a poor
performance on the Wi-Fi; or when you have hidden stations (e.g. in an
exchange between stations A and B, a third station which is visible by A but
not by B, hence interfering with B when it sends to A). On other case this
protection decreases the global Wi-Fi performance.
Retry settings:
Unicast data frames are normally acknowledged. If the transmitter does not
receive the acknowledgment, it must resend the frame.
In 802.11n, several frames can be aggregated into one big frame called an
A-MPDU. Independent frames are acknowledged by an individual ACK
frame, while A-MPDU frames are acknowledged by a single “block
acknowledge” frame containing one acknowledgment for each subframe in
the A-MPDU. Unacknowledged frames are resent in a later A-MPDU.
When you check this option you can control the number of retries.
Short retry:
This is the number of retries for a physical data frame (single or A-MPDU).
Long retry:
This is the number of retries for a physical data frame (single or A-MPDU)
sent with the RTS/CTS protocol.
Aggregate retry:
This option configures the number of retries for a frame aggregated into an
A-MPDU (each 802.11 frame sent in A-MPDU frame).
