Can't connect Sony Tablet to wifi ?

I have the CISCO 2921-V/K9 router.i tried everything. resetting network resetting router.Help! i just got the Sony tablet won't connect to wireless. How can i do ?

Wi-Fi, depending on which 802.11 specification is in question (-, a, b, g, n) works at either 2.4GHz, 3.7GHz (US only) or 5GHZ:
http://en.wikipedia.org/wiki/IEEE_802.11
http://en.wikipedia.org/wiki/Wi-Fi
The C7 is listed as supporting 802.11 b/g/n on http://www.developer.nokia.com/Devices/Device_specifications/C7-00/

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