Foundry Networks IronPoint 200 User Manual page 179

Command Usage
• The Delivery Traffic Indication Map (DTIM) packet interval value indicates how often the MAC
layer forwards broadcast/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/multicast
information. The default value of 2 indicates that the access point will save all
broadcast/multicast frames for the Basic Service Set (BSS) and forward them after every
second beacon.
• Using smaller DTIM intervals delivers broadcast/multicast frames in a more timely manner,
causing stations in Power Save mode to wake up more often and drain power faster. Using
higher DTIM values reduces the power used by stations in Power Save mode, but delays the
transmission of broadcast/multicast frames.
fragmentation-length
This command configures the minimum packet size that can be fragmented when passing through
the access point.
Syntax
fragmentation-length <length>
length - Minimum packet size for which fragmentation is allowed. (Range: 256-2346 bytes)
Default Setting
2346
Command Mode
Interface Configuration (Wireless)
Command Usage
• 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.
rts-threshold
This command sets the packet size threshold at which a Request to Send (RTS) signal must be sent
to the receiving station prior to the sending station starting communications.
Syntax
rts-threshold <threshold>
threshold - Threshold packet size for which to send an RTS. (Range: 0-2347 bytes)
Default Setting
2347
Command Mode
Interface Configuration (Wireless)
December 2006 © 2006 Foundry Networks, Inc.
Radio Interface Configuration
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