0 votes 0 votes The unlicensed National Information Infrastructure band operates at the _________ frequency (A) 2.4 GHz (B) 5 GHz (C) 33 MHz (D) 5 MHz Computer Networks ugcnetcse-dec2009-paper2 computer-networks wireless-lan + – rishu_darkshadow asked Sep 17, 2017 recategorized Oct 5, 2018 by Pooja Khatri rishu_darkshadow 1.4k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 0 votes 0 votes The Unlicensed National Information Infrastructure (U-NII)[1][2] radio band is part of the radio frequency spectrum used by IEEE-802.11a devices and by many wireless ISPs. It operates over four ranges: U-NII Low (U-NII-1[3]): 5.150-5.250 GHz. Originally limited to indoor use only. Regulations required use of an integrated antenna, with power limited to 50 mW.[4] Rules changed in 2014 to permit outdoor operation, maximum fixed power 1 watt, maximum fixed EIRP 4 watts (+36 dBm) point-to-multipoint, 200 watts (+53 dBm) point-to-point. [1] However, strict out-of-band emission rules limit practical point-to-point power to lower levels. U-NII Mid (U-NII-2A[3]): 5.250-5.350 GHz. Both outdoor and indoor use, subject to Dynamic Frequency Selection (DFS, or radar avoidance). Regulations allow for a user-installable antenna.[5] Power limited to 250 mW[4] U-NII-2B: 5.350-5.470 GHz. Currently 120MHz of spectrum not allocated by the FCC for unlicensed use. U-NII Worldwide (U-NII-2C / U-NII-2e): 5.470-5.725 GHz. Both outdoor and indoor use, subject to Dynamic Frequency Selection (DFS, or radar avoidance).[5] Power limited to 250 mW.[4] This spectrum was added by the FCC in 2003 to "align the frequency bands used by U-NII devices in the United States with bands in other parts of the world".[5] The FCC currently has an interim limitation on operations on channels which overlap the 5600 - 5650 MHz band.[6] U-NII Upper (U-NII-3[7]): 5.725 to 5.850 GHz. Sometimes referred to as U-NII / ISM due to overlap with the ISM band. Regulations allow for a user-installable antenna. Power limited to 1W[4] Ans: B ref: https://en.wikipedia.org/wiki/U-NII rishu_darkshadow answered Sep 21, 2017 rishu_darkshadow comment Share Follow See all 0 reply Please log in or register to add a comment.