Unlicensed National Information Infrastructure (U-NII) devices operate in certain segments of the 5 GHz band and provide a wide array of high-data-rate mobile and fixed communications for individuals, businesses, and institutions, particularly for wireless local area networking –including Wi-Fi—and broadband access.
The rules for U-NII operation are set out in 47 CFR Part 15 Subpart E. In the First Report and Order in ET Docket No 13-49 adopted March 31, 2014, the Commission modified the rules for the U-NII-1 5.15-5.25 GHz band to allow certain access points to operate outdoors with up to 1 watt of conducted power. At the same time, the Commission took steps to ensure that incumbent systems are sufficiently protected from harmful interference. Specifically, Section 15.407 (j) provides a safeguard against harmful interference to incumbent systems in the 5.15-5.25 GHz U-NII-1 band by requiring accountability for large scale deployments of access points. Companies that deploy an aggregate total of more than one thousand outdoor access points within the band must submit a letter acknowledging that they may be required to take corrective actions should their devices cause harmful interference within the band.
The links below provide the notification letters received by the FCC.