Security - 3Com 3CRWE825075A User Manual

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S
ECURITY
The Security page allows you to set up lower-layer client authentication and data
encryption parameters as described below. When you are finished configuring items on
this page, click Apply.
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. (Default: 2346)
RTS Threshold (0-2347)—Set the RTS (Request to Send) frame length. You may
configure the access point to initiate an RTS frame sequence always, never, or only
on frames longer than a specified length. If the packet size is smaller than the preset
RTS threshold size, the RTS/CTS mechanism will not be enabled.
The access point sends RTS frames to a particular 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 acknowledge the right of the sending station to send data
frames. The access points contending for the medium may not be aware of each
other. The RTS/CTS mechanism can solve this hidden node problem. (Default:
2346)
Preamble Setting (802.11g and 802.11b only)—IEEE 802.11 frames begin with
an alternating pattern of 1s and 0s called the preamble, which tells receiving
stations that a frame is arriving. This provides time for the receiving station to
synchronize to the incoming data stream. Enabling the Short preamble can boost
your throughput; however, this can cause interoperability issues. (Default: Long)
Client Access Mode (802.11g only)—802.11g radios can support both 802.11b
and 802.11g clients. This option determines which mode the radio will operate in
and consequently which clients will be able to connect to the radio interface. The
default is to provide information for both 802.11g and 802.11b clients. Higher
throughput can be achieved if the option for the 802.11g clients only is selected
(since the radio is not required to transmit at the lower 802.11b rates/method).
Data Beacon Rate (802.11g only)—Sets the interval at which a beacon will
contain a delivery traffic indicator message (DTIM). The Access Point sends a
DTIM to signal clients which are in sleep mode that a message is waiting to be
delivered to them. The range for this setting is 1-255 beacons. (Default: 2)
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