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[Final Draft—Nortel Confidential]
40
Chapter 2 System Configuration
Beacon Interval (20-1000)
Sets the beacon signal interval. The beacon signals allow the wireless devices to
maintain contact with each other. They may also carry power-management
information. (Default: 100 TU)
DTIM Period (1-16384)
Sets the Delivery Traffic Indication Map (DTIM) packet interval value. The DTIM
indicates how often the MAC layer forwards multicast traffic. This parameter is
necessary to wake up stations that are using Power Save mode.
The DTIM is the interval between two synchronous frames with broadcast
information. If you set the value to 2, the access point will save all multicast
frames for the BSS and forward them after every second beacon. Having smaller
DTIM intervals delivers multicast frames in a more timely manner, causing
stations in Power Save mode to wake up more often and drain power faster.
Having higher DTIM values reduces the power used by stations in Power Save
mode, but delays the transmission of multicast frames. (Default: 5 Beacons)
Fragment Length (256-2347)
The "Fragment Length" can be set between 256 and 2,346. If the packet size is
smaller than the preset Fragment size, the packet will not be segmented.
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: 2347)
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
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