- UCT unconditional transition
- UDP (User Datagram Protocol) The IP standard protocol that allows an application program on one machine to send a datagram to an application program on another machine. UDP uses the Internet IP to deliver datagrams.
- UP unformatted page
- UPS (Uninterruptible Power Supply) A battery, attached to a piece of hardware, for example a server, that provides backup power for conducting an orderly shutdown if the server's normal power supply fails.
- UTP (Unshielded Twisted Pair) The standard cabling used for telephone lines. The standard IEEE 802.3, 10BaseT, defines use of Ethernet over UTP for rates up to l0Mbit/s. The general LAN medium of choice for the 1990s, UTP is marketed in brands such as AT&T's PDS (Systimax) and OSCA.