D-Link DI-514 - Manual (Page 28)

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Advanced > Performance
Beacon Interval - Beacons are packets sent by an Access Point to
synchronize a wireless network. Specify a value. 100 is the default setting
and is recommended.
RTS Threshold - This value should remain at its default setting of 2432. If
inconsistent data flow is a problem, only a minor modification should be
made.
Fragmentation - This value should also remain at its default setting of 2346.
If you experience a high packet error rate, you may slightly increase your
Fragmentation Threshold within the value range of 256 to 2,346. Setting the
Fragmentation Threshold too low may result in poor performance.
DTIM - (Delivery Traffic Indication Message) 3 is the default setting. A DTIM
is a countdown informing clients of the next window for listening to broadcast
and multicast messages.
Basic Rates – Select the data rate. Default is 1-2-5.5-11Mbps.