D-Link DI-524UP - Manual (Page 55)

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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