D-Link DWR-512 User Manual page 72

Section 4 - Connecting to a Wireless Network
3. Enter the same security key or passphrase that is on your router and click
Connect.
It may take 20-30 seconds to connect to the wireless network. If the connection
fails, please verify that the security settings are correct. The key or passphrase
must be exactly the same as on the wireless router.
D-Link DWR-512 User Manual 67