IOGear GWP512 Manual - Manual (Page 74)

WPA
To connect with an AP through RADIUS server, click
the items in Authentication box.
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WPA-PSK
To connect with an AP using the Pre-shared key
configuration (WPA-PSK), uncheck items in
Authentication box. In the Passphrase box, enter
the configuration key. The key should match the
one set in AP.
WPA Configuration