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(1) (UNique Ingredient Identifier) See healthcare IT.

(2) (Unlicensed-National Information Infrastructure) A part of the national spectrum sanctioned by the FCC in 1997 that does not require a license for short-range wireless use. One of the purposes for U-NII was to enable schools, libraries and healthcare organizations in rural areas to more easily connect to the Internet and private, high-speed networks.

Radar Has Priority
U-NII channels 52 through 140 (5.26-5.7 GHz) require transmitting devices to use dynamic frequency selection (DFS) to avoid conflicts with radar pulses. A DFS frequency must be clear of radar for one minute before using it, and if radar is detected on the current channel, the transmitter must switch to another channel, also free of radar for one minute. See ISM band and WiSA.

U-NNI BANDSIndoor/  MaxFrequency     Outdoor  PowerRange (GHz)   Usage    (mW)  DFS?

 5.150-5.250   In       50    no

 5.250-5.350   In/Out  250    yes

 5.470-5.725   In/Out  250    yes

 5.725-5.825   Out    1000    no
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References in periodicals archive ?
Summit utilizes the newly opened 5GHz U-NII band spectrum to eliminate interference with common household wireless devices such as Wi-Fi networks, cordless phones, bluetooth devices and microwaves in the crowded 2.
Due to the rapidly growing demand for broadband wireless communication, the operating frequency is moving toward the 5 GHz U-NII band.
The U-NII Band would allow individuals and organizations to purchase computers with radio communications capabilities and sufficient bandwidth to support voice and video communications as well as much higher data transmission rates than those available from most facilities today (up to twenty megabits per second).
Due to the fast growing demand for broadband wireless communications, the operating frequency band is moving toward the 5 GHz U-NII band.
775 GHz U-NII band (unlicensed) using narrow-band microwave transmission with two-level network access control and optional RSA encryption.
This article presents a fully-integrated 5 GHz CMOS voltage-controlled oscillator (VCO)for a U-NII band 802.
825' GHz GaAs MMIC U-NII band power amplifier that provides 22 dB of gain and +28.