Buffalo Technology WLI-TX4-G54HP - Manual (Page 14)

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After selecting a wireless network, you will be returned to the main Web Based
Configuration page.
If the wireless network you are attempting to connect to is not broadcasting its SSID,
then you will be required to manually enter the SSID into the SSID field. After the field is
populated with the proper SSID, press the Apply Settings button.
If encryption is enabled on the wireless network you've selected, you will need to enter the
encryption key (see page 15).