U

UBR       Unspecified Bit Rate
UCR       Unità di Concentrazione di Rete (Telecom Italia)
UDI       Unrestricted Digital Information
UDLC      Universal Digital Loop Carrier
UDP       User Datagram Protocol (IP suite)
UDPC      Universal Digital Portable Communications
UE        User Element
UF        User Facility
UHF       Ultra-High Frequency
UHF       Ultra High Frequency
UIT       Unione Internazionale Telegrafica (comprende CCITT e CCIR)
ULP       User Location Protocol
ULPC      Up-Link Power Control - anche UPPC
ULS       Universal Locator Service (Internet)
Um        interfaccia radio (GSM)
UMTS      Universal Mobile Telecommunication System
UNI       User Network Interface (ATM)
UNMA      Unified Network Management Architecture
UPBO      Upstream Power Back-Off
UPN       Universal Personal Number
UPPC      Up-Path Power Control - anche ULPC
UPS       Uninterrupted/Uninterruptible Power System/Supply
UPT       Universal Personal Telecommunication
UPTN      UPT Number
URL       Uniform Resource Locator (Internet)
USAT      Ultra Small Aperture Terminal
USDC      US Digital Communications
USF       Universal Service Fund
UTP       Unshielded Twisted Pair
UTTP      Unshielded Telephone Twisted Pair
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