U-NII (Unlicensed National Information Infrastructure)

Radio spectrum in the 5 GHz range

made available for use on an unlicensed basis in the United States. Indoor applications include wireless LANs (WLANs) such as 802.11a (Wi-Fi5) and HiperLAN. Outdoor applications include wireless local loop (WLL). See also 802.11a, HiperLAN, Wi-Fi-5, WLAN, and WLL.

• CIP (Classical IP over ATM)
• cipher
• CIR (Committed Information Rate)
• circuit
• circuit switch
• circuit-switched data (CSD)
• circuit-switched network
• circuit terminating equipment
• Citizens Band (CB)
• cladding
• Clarke orbit
• Clarke, Sir Arthur C. (1917–)
• Class 1
• Class 1
• Class 2
• Class 2
• Class 3
• Class 4
• Class 4/5
• Class 5
• Class A ATM traffic
• Class A cable
• Class A IP address
• Class B ATM traffic
• Class B cable