WiFoo..The.Secrets.of.Wireless.Hacking [Electronic resources] نسخه متنی

U

UHF

ultra high frequency. Ultra high-frequency radio waves that are in the range of 300 to 3000 MHz.

ultra-wide band

A new technology provides very high data rates through the use of very short duration and very low-power pulses.

UNII

Unlicensed National Information Infrastructure. Refers to IEEE 802.11a standard for operating in the 5-GHz radio band. There are currently three such UNII bands for a total of 300 MHz of spectrum allocated within the United States. Different FCC rules and regulations cover each of the UNII1 through UNII3 bands.