Planet WNL-U553 User Manual page 19

Preamble
RTS Threshold
Fragment Threshold
Parameter
station in the Wireless LAN network without through an Access Point or
Router.
The preamble defines the length of the CRC block for communication
among wireless devices. This option is only active in the Ad Hoc network.
There are two modes including Auto and Long Preamble. If "Auto"mode
is selected, the card will auto switch the preamble mode depending on
the wireless devices the card is connecting to.
Minimum packet size required for an RTS (Request To Send). For
packets smaller than this threshold, an RTS is not sent and the packet is
transmitted directly to the wireless network. Select a setting within a
range of 0 to 2347 bytes. Minor change is recommended.
The value defines the maximum size of packets; any packet size larger
than the value will be fragmented. If you have decreased this value and
experience high packet error rates, you can increase it again, but it will
likely decrease overall network performance. Select a setting within a
range of 256 to 2346 bytes. Minor change is recommended.
Description