Alfa Network R36 User Manual page 35

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Fragmentation Threshold – Configures the minimum packet size that can be
fragmented when passing through the access point.
Fragmentation of the PDUs (Package Data Unit) can increase the reliability of
transmissions because it increases the probability of a successful transmission
due to smaller frame size. If there is significant interference present, or collisions
due to high network utilization, try setting the fragment size to send smaller
fragments. This will speed up the retransmission of smaller frames. However, it is
more efficient to set the fragment size larger if very little or no interference is
present because it requires overhead to send multiple frames. (Range: 256-2346
bytes; Default: 2346 bytes)
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RTS Threshold — Sets the packet size threshold at which a Request to
Send (RTS) signal must be sent to a receiving station prior to the sending station
starting communications. The access point sends RTS frames to a receiving
station to negotiate the sending of a data frame. After receiving an RTS frame,
the station sends a CTS (clear to send) frame to notify the sending station that it
can start sending data. If the RTS threshold is set to 0, the access point always
sends RTS signals. If set to 2347, the access point never sends RTS signals. If set
to any other value, and the packet size equals or exceeds the RTS threshold, the
RTS/CTS (Request to Send / Clear to Send) mechanism will be enabled.
The access points contending for the medium may not be aware of each other. The
RTS/CTS mechanism can solve this ―Hidden Node Problem.‖
(Range: 1-2347 bytes: Default: 2347 bytes)
◆ Short Preamble — Sets the length of the signal preamble that is used at the start
of a data transmission. Use a short preamble (96 microseconds) to increase data
throughput when it is supported by all connected 802.11g clients. Use a long
preamble (192 microseconds) to ensure all 802.11b clients can connect to the
network. (Default: Disabled)
◆ Short Slot — Sets the basic unit of time the access point uses for calculating
waiting times before data is transmitted. A short slot time (9 microseconds) can
increase data throughput on the access point, but requires that all clients can
support a short slot time (that is, 802.11gcompliant clients must support a short
slot time). A long slot time (20 microseconds) is required if the access point has
to support 802.11b clients. (Default: Enabled)
TX Burst — A performance enhancement that transmits a number of data
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packets at the same time when the feature is supported by compatible clients.
(Default: Enabled)
Packet Aggregate — A performance enhancement that combines data packets
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together when the feature is supported by compatible clients.(Default: Enabled)
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