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AT-TQ2403 Management Software User's Guide 111
Field Description
DTIM Period All Beacon frames include a Traffic Information Map information element (TIM
IE). In some beacon frames, the TIM IE includes a Delivery Traffic Information
Map (DTIM) message. These special DTIM beacons are sent at an interval
specified in the DTIM period. Another way of expressing this is:
Every
x
th TIM IE is DTIM (where
X
= DTIM Period)
The DTIM beacon alerts the clients that multicast and broadcast packets
buffered at the AP will be transmitted immediately after the transmission of this
beacon frame.
To set the DTIM Period for an AP, specify a DTIM period within the given range
(1 - 255).
The higher the DTIM period, the longer the delay between the delivery of
multicast frames.
The DTIM period, measured in beacon intervals, indicates the number of
beacons between two consecutive DTIM beacons. For example, if you set this
to "1" clients will check for buffered data on the AP at every beacon. If you set
this to "2", clients will check on every other beacon. If you set this to 10, clients
will check on every 10th beacon.
Fragmentation
Threshold
Specify a number between 256 and 2,346 to set the frame size threshold in
bytes.
The fragmentation threshold is a way of limiting the size of packets (frames)
transmitted over the network. If a packet exceeds the fragmentation threshold
set here, the fragmentation function will be activated and the packet will be sent
as multiple 802.11 frames.
If the packet being transmitted is equal to or less than the threshold,
fragmentation will not be used.
Setting the threshold to the largest value (2,346 bytes) effectively disables
fragmentation.
Fragmentation involves more overhead both because of the extra work of
dividing up and reassembling of frames it requires, and because it increases
message traffic on the network. However, fragmentation can help improve
network performance and reliability if properly configured.
Sending smaller frames (by using lower fragmentation threshold) may help with
some interference problems; for example, with microwave ovens.
By default, fragmentation threshold is 2346. We recommend not using
fragmentation unless you suspect radio interference. The additional headers
applied to each fragment increase the overhead on the network and can greatly
reduce throughput.