U-NII
U-NII stands for U nlicensed N ational I nformation I nfrastructure . It is the US designation for the license-free frequency band in the 5 GHz range.
This range is divided into several sub-bands of 100 MHz each:
- 5.15-5.25 GHz (U-NII-1)
- 5.25-5.35 GHz (U-NII-2A)
- 5.470-5.725 GHz (U-NII-2C)
- 5.725-5.825 GHz (U-NII-3)
- 5.85-5.925 GHz (U-NII-4)
Probably the best known user of the U-NII band is the WLAN standard 802.11a or 802.11h .