What is U-NII?

 What's U-NII? Unlicensed National Information Infrastructure
Unlicensed National Information Infrastructure

     U-NII is the three unlicensed frequency bands of 100MHz each in the 5 GHz band, designated by the U.S. Federal Communications Commission (FCC) to provide high-speed wireless networking. The three frequency bands-5.15 GHz through 5.25 GHz (for indoor use only), 5.25 GHz through 5.35 GHz, and 5.725 GHz through 5.825 GHz-were allocated in 1997.

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 What's U-NII? Unlicensed National Information Infrastructure