TRENDnet TEW-421PC - Manual (Page 11)

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The Fully Automatic and Turbo Mode will automatically detect the
suitable linking transfer rate and auto fall back when the signal is not
too strong to transmit data.
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Power Saving:
To set your Wireless Cardbus Card as power saving mode, select
“Off”, “Normal” or “Maximum”.
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Transmit Power:
By selecting the Transmit Power, you can select the Radio Frequency
output power from Minimum, 12.5%, 25%, 50%, 100% or Auto.
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Preamble Type:
The usage of the preamble is to limit the packet size of the data to
transmit. It is recommended to choose the short preamble when the
link quality is bad, it is to prevent the wasting time of resending a long
packet that is lost. The Default is Auto which access short and long
preamble.
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¾ Authentication Type:
Open System: with the same WEP key between the stations, the
stations don’t need to be authenticated, and this algorithm was set to
default.
Shared Key: with the same WEP key between the stations in this
Authentication algorithm, this type will use packets with encryption
by transferring a challenge text which will be acknowledge by both
side of the stations. In order to choose which authentication algorithm
will be used, you must know which one the station supports this
algorithm first.
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Country Domain:
Each country has its own regulation of the wireless domain, at the
Country Domain Selection screen, select the correct country domain.
If you are not sure which domain to select, click on the drop down list
to see the included countries and domains then click “Ok”.
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Fragment Threshold:
Fragmentation Threshold is a way of transmitting the packets that will
be fragmented. Choose a setting within a range of 256 to 2432. It is
recommended to fragment the packet when the link quality is bad, it is
to prevent the wasting time of resending a long packet that is lost.