Samsung PN51D490A1DXZA - Manual (Page 91)

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● If Pure High-throughput (Greenfield) 802.11n mode is selected and the
Encryption type is set to WEP, TKIP or TKIP AES (WPS2Mixed) for your AP,
Samsung TVs will not support a connection in compliance with new Wi-Fi
certification specifications.
● If your AP supports WPS (Wi-Fi Protected Setup), you can connect to the
network via PBC (Push Button Configuration) or PIN (Personal Identification
Number). WPS will automatically configure the SSID and WPA key in either
mode.
● If your router, modem, or device is not certified, it may not connect to the TV
via the “Samsung Wireless LAN adapter.”