AirLive WN-5000R-USB v2 - Manual (Page 26)

high setting here if you found that radio reception is bad.
If you don’t know which one to use, select ‘Auto’.
Preamble This option is only available when the network type is ‘Ad hoc’. You can select
‘Auto’ or ‘Long Preamble’. Please select ‘Auto’ if you don’t know what it is.
RTS Threshold Check the box and you can set RTS threshold manually here. Do not modify
default setting unless you know what it is.
Fragment Check the box and you can set fragment threshold
Threshold manually here. Do not modify default setting unless you know what it is.
Now click ‘Authentication and Security’ tab, and set the encryption and authentication settings.
Here are descriptions of every setup items:
Authentication Select the authentication type of the wireless access point or wireless device you wish
Type to connect. If you’re adding a profile from an existing access point or wireless device,
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the value will be selected automatically, and please do not modify it.