SMC Networks EZ CONNECT SMC2755W ユーザーズマニュアル

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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, though, delays the transmission of 
multicast frames. 
(Default: 1)

Fragment Length (256-2346): 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 can increase the reliability of 
transmission 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 
enable the retransmission of smaller frames much faster. 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)