U-NII

The Unlicensed National Information Infrastructure (U-NII) radio band is part of the radio frequency spectrum used by IEEE-802.11a devices and by many wireless ISPs. It operates over three ranges:

*U-NII Low: 5.15-5.25 GHz. Regulations require use of an integrated antenna. Power limited to 50mW [http://www.hallikainen.com/FccRules/2006/15/407/ FCC 15.407 as of September 13, 2006 - hallikainen.com ] ]
*U-NII Mid: 5.25-5.35 GHz. Regulations allow for a user-installable antenna, subject to Dynamic Frequency Selection (DFS, or radar avoidance) [http://www.atcb.com/publicdocs/fcc-03-287a1-UNII-Changes.pdf FCC-03-287A1.doc ] ] . Power limited to 250mW
*U-NII Worldwide: 5.47-5.725 GHz. Both outdoor and indoor use, subject to Dynamic Frequency Selection (DFS, or radar avoidance). Power limited to 250mW. 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".
*U-NII Upper: 5.725 to 5.825 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

Wireless ISPs generally use 5.725-5.825 GHz.

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 the U-NII band.

ources

* [http://www.heise.de/english/newsticker/news/61748 15.07.2005, Heise: 5 GHz WLAN to be available all over Europe] Citat: "...Today, the European Commission resolved in Brussels to regulate two blocks in the 5 GHz range (5150-5350 MHz and 5470-5725 MHz) for all of Europe..."
* [http://www.cisco.com/univercd/cc/td/doc/product/wireless/cb21ag/icg02/winglskh.htm Cisco: Glossary]

ee also

*Part 15 (FCC rules)
*ISM band
*802.11

References

External links

* In the USA, CFR [http://frwebgate.access.gpo.gov/cgi-bin/get-cfr.cgi?TITLE=47&PART=15&SECTION=407&TYPE=TEXT&YEAR=2005 Title 47 Part 15] (revised in 2005) describes the regulation of the U-NII bands.