D-Link DI-524UP manual CTS Clear To Send is a function used to minimize

CTS Mode	CTS (Clear To Send) is a function used to minimize
	collisions among wireless devices on a wireless local
	area network (LAN). CTS will make sure the wireless
	network is clear before a wireless client attempts to
	send wireless data. Enabling CTS will add overhead
	and may lower wireless throughput.
	Auto - CTS will monitor the wireless network and
	automatically decide whether to implement CTS based
	on the amount of traffic and collisions that occurs on
	the wireless network.
	Always - CTS will always be used to make sure the
	wireless LAN is clear before sending data.
	None - CTS is typically used in a pure 802.11g
	environment. If CTS is set to “None” in a mixed mode
	environment populated by 802.11b clients, wireless
	collisions may

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