U-NII

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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]): 5.15-5.25 GHz. Indoor use only. Regulations require use of an integrated antenna. Power limited to 50 mW^[4]
U-NII Mid (U-NII-2^[3]): 5.25-5.35 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 Worldwide (U-NII-2e): 5.47-5.725 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^[3]): 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^[4]

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 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.

Countries apply their own regulations to both the allowable channels, allowed users and maximum power levels within these frequency ranges. Consult your local authorities as these regulations may be out of date as they are subject to change at any time.

In 2007 the FCC (United States) began requiring that devices in 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.

channel	frequency (MHz)	United States	Europe	Japan		Singapore	China	Israel	Korea	Turkey
channel	frequency (MHz)	40/20 MHz^[7]	40/20 MHz	40/20 MHz^[8]	10 MHz	20 MHz	20 MHz	20 MHz^[9]	20 MHz^[10]	20 MHz
183	4915	No	No	No	Yes	No	No	No	No	No
184	4920	No	No	Yes	Yes	No	No	No	No	No
185	4925	No	No	No	Yes	No	No	No	No	No
187	4935	No	No	No	Yes	No	No	No	No	No
188	4940	No	No	Yes	Yes	No	No	No	No	No
189	4945	No	No	No	Yes	No	No	No	No	No
192	4960	No	No	Yes	No	No	No	No	No	No
196	4980	No	No	Yes	No	No	No	No	No	No
7	5035	No	No	No	Yes	No	No	No	No	No
8	5040	No	No	No	Yes	No	No	No	No	No
9	5045	No	No	No	Yes	No	No	No	No	No
11	5055	No	No	No	Yes	No	No	No	No	No
12	5060	No	No	No	No	No	No	No	No	No
16	5080	No	No	No	No	No	No	No	No	No
34	5170	No	No	No	No	No	No	Yes	Yes	Yes
36	5180	Yes	Yes	Yes	No	Yes	No	Yes	Yes	Yes
38	5190	No	No	No	No	No	No	Yes	Yes	Yes
40	5200	Yes	Yes	Yes	No	Yes	No	Yes	Yes	Yes
42	5210	No	No	No	No	No	No	Yes	Yes	Yes
44	5220	Yes	Yes	Yes	No	Yes	No	Yes	Yes	Yes
46	5230	No	No	No	No	No	No	Yes	Yes	Yes
48	5240	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes
52	5260	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes
56	5280	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes
60	5300	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes
64	5320	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes
100	5500	Yes^[11]	Yes	Yes	No	No	No	No	Yes	No
104	5520	Yes^[11]	Yes	Yes	No	No	No	No	Yes	No
108	5540	Yes^[11]	Yes	Yes	No	No	No	No	Yes	No
112	5560	Yes^[11]	Yes	Yes	No	No	No	No	Yes	No
116	5580	Yes^[11]	Yes	Yes	No	No	No	No	Yes	No
120	5600	No^[11]	Yes	Yes	No	No	No	No	Yes	No
124	5620	No^[11]	Yes	Yes	No	No	No	No	Yes	No
128	5640	No^[11]	Yes	Yes	No	No	No	No	Yes	No
132	5660	Yes^[11]	Yes	Yes	No	No	No	No	No	No
136	5680	Yes^[11]	Yes	Yes	No	No	No	No	No	No
140	5700	Yes^[11]	Yes	Yes	No	No	No	No	No	No
149	5745	Yes	No	No	No	Yes	Yes	No	Yes	Yes
153	5765	Yes	No	No	No	Yes	Yes	No	Yes	Yes
157	5785	Yes	No	No	No	Yes	Yes	No	Yes	Yes
161	5805	Yes	No	No	No	Yes	Yes	No	Yes	Yes
165	5825	Yes	No	No	No	Yes	Yes	No	Yes	Yes

References

↑ "15.07.2005, Heise: 5 GHz WLAN to be available all over Europe" www.heise.de
↑ "Cisco: Glossary" www.cisco.com
↑ 3.0 3.1 3.2 "Dynamic Frequency Selection for 5 GHz WLAN in the US and Canada" www.cisco.com
↑ 4.0 4.1 4.2 4.3 FCC 15.407 as of September 13, 2006 - hallikainen.com
↑ 5.0 5.1 5.2 FCC-03-287A1.doc
↑ "15E, Dynamic Frequency Selection, DFS, DFS Approval" fcc.gov
↑ FCC 15.407 as of August 8, 2008 – hallikainen.com
↑ 802.11-2007 Japan MIC Released the new 5 GHz band (W56). Bureau Veritas — ADT. Retrieved 2008-02-23.
↑ Israel: "צו הטלגרף האלחוטי (אי תחולת הפקודה) (מס' 2), התשס"ו – 2005" (in hebrew).
↑ Korea Frequency Distribution Table 2008.12.31 (in Korean)
↑ 11.0 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 11.10 "Publication Number: 443999 Rule Parts: 15E". FCC. October 5, 2009. "Devices must be professionally installed when operating in the 5470 – 5725 MHz band"

External links

In the USA, CFR Title 47 Part 15 (revised in 2005) describes the regulation of the U-NII bands.

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U-NII

5 GHz (802.11a/h/j/n)

See also

References

External links