U-NII

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:

Band Freq. Range Bandwidth Max Power Max EIRP
U-NII Low / U-NII-1 / U-NII Indoor 5.150–5.250 GHz 100 MHz 50 mW 200 W
U-NII Mid / U-NII-2A 5.250–5.350 GHz 100 MHz 250 mW 1 W
U-NII-2B 5.350–5.470 GHz 120 MHz . .
U-NII Worldwide / U-NII-2C / U-NII-2-Extended / U-NII-2e 5.470–5.725 GHz 255 MHz . .
U-NII Upper / U-NII-3 5.725–5.825 GHz 100 MHz 1 W 200 W
DSRC/ITS / U-NII-4 5.850–5.925 GHz   75 MHz . .

Wireless ISPs generally use 5.725-5.825 GHz.
In the USA licensed amateur radio operators are authorized 5.650-5.925 GHz by Part 97.303 of the FCC rules.

U-NII is an FCC regulatory domain for 5- GHz wireless devices. U-NII power limits are defined by the United States CFR Title 47 (Telecommunication), Part 15 - Radio Frequency Devices, Subpart E - Unlicensed National Information Infrastructure Devices, Paragraph 15.407 - General technical requirements. Regulatory use in individual countries may differ.

The European HiperLAN standard operates in same frequency band as the U-NII.

5 GHz (802.11a/h/j/n)

Except where noted, all information taken from Annex J of IEEE 802.11-2007 modified by amendments k, y and n. Because countries set their own regulations regarding specific uses and maximum power levels within these frequency ranges, it is recommended that local authorities are consulted as regulations may change at any time.

In 2007, the FCC began requiring that devices operating in channels 52, 56, 60 and 64 must have Dynamic Frequency Selection (DFS) capabilities. This is to avoid communicating in the same frequency range as some radar. In 2014, the FCC issued new rules[9] for all devices due to interference with government weather radar systems. Fines and equipment seizure were listed as punishment for non-compliance.

Band channel frequency
(MHz)
United States Europe Japan Singapore China Israel Korea Turkey
40/20 MHz[10] 40/20 MHz 40/20 MHz[11] 10 MHz 20 MHz 20 MHz 20 MHz[12] 20 MHz[13] 20 MHz
1834915NoNoNoYesNoNoNoNoNo
1844920NoNoYesYesNoNoNoNoNo
1854925NoNoNoYesNoNoNoNoNo
1874935NoNoNoYesNoNoNoNoNo
1884940NoNoYesYesNoNoNoNoNo
1894945NoNoNoYesNoNoNoNoNo
1924960NoNoYesNoNoNoNoNoNo
1964980NoNoYesNoNoNoNoNoNo
75035NoNoNoYesNoNoNoNoNo
85040NoNoNoYesNoNoNoNoNo
95045NoNoNoYesNoNoNoNoNo
115055NoNoNoYesNoNoNoNoNo
125060NoNoNoNoNoNoNoNoNo
165080NoNoNoNoNoNoNoNoNo
U-NII-1345170NoNoNoNoNoNoYesYesYes
365180YesYesYesNoYesNoYesYesYes
385190NoNoNoNoNoNoYesYesYes
405200YesYesYesNoYesNoYesYesYes
425210NoNoNoNoNoNoYesYesYes
445220YesYesYesNoYesNoYesYesYes
465230NoNoNoNoNoNoYesYesYes
485240YesYesYesNoNoNoYesYesYes
U-NII-2A525260YesYesYesNoNoNoYesYesYes
565280YesYesYesNoNoNoYesYesYes
605300YesYesYesNoNoNoYesYesYes
645320YesYesYesNoNoNoYesYesYes
U-NII-2B.5350–5470Nounknown
U-NII-2C1005500Yes[14]YesYesNoNoNoNoYesNo
1045520Yes[14]YesYesNoNoNoNoYesNo
1085540Yes[14]YesYesNoNoNoNoYesNo
1125560Yes[14]YesYesNoNoNoNoYesNo
1165580Yes[14]YesYesNoNoNoNoYesNo
1205600No[15]YesYesNoNoNoNoYesNo
1245620NoYesYesNoNoNoNoYesNo
1285640NoYesYesNoNoNoNoYesNo
1325660Yes[14]YesYesNoNoNoNoNoNo
1365680Yes[14]YesYesNoNoNoNoNoNo
1405700Yes[14]YesYesNoNoNoNoNoNo
U-NII-31495745YesNoNoNoYesYesNoYesYes
1535765YesNoNoNoYesYesNoYesYes
1575785YesNoNoNoYesYesNoYesYes
1615805YesNoNoNoYesYesNoYesYes
1655825YesNoNoNoYesYesNoYesYes
U-NII-4[16]1695845Nounknown
1735865Nounknown
1775885Nounknown
1815905Nounknown
1855925
(proposed expansion)
Nounknown

See also

References

External links

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