D-Link DSL-2750B - Wireless Security Mode; WPA-Personal; WPA-Enterprise

Section 3 - Configuration
D-Link DSL-2750B User Manual
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WIRELESS SECURITY MODE:
WPA-Personal
WPA only (WPA-PSK) configuration is similar to WEP. The key length is
between 8 to 63 ASCII characters or 64 hexadecimal digits.
WIRELESS SECURITY MODE:
WPA-Enterprise
You can only use WPA-Enterprise if you have set up RADIUS server.
This is the WPA/WPA2 authentication with RADIUS server instead of
pre-shared key,