Astak R4020A - User Manual - Manual (Page 37)

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Item Description
Select SSID Select the SSID you want to set an encryption for.
Encryption Select “WPA2”.
Authentication Mode Select “Enterprise (RADIUS)” mode.
WPA Cipher Suite
There are 2 types provided: TKIP and AES. Select one according
to your need.
>> Personal (Pre-Shared Key) Authentication