Coordinated Universal Time is a time scale that couples Greenwich Mean Time, which is based solely on the Earth’s inconsistent rotation rate, with highly accurate atomic time. UTC was devised on January 1, 1972 and is coordinated in Paris by the International Bureau of Weights and Measures.
When atomic time and Earth time approach a one second difference, a leap second is calculated into UTC. These leap seconds have been known to contribute in some cases to leap second bugs, which are computer glitches and outages in servers caused by the addition of a leap second.
UTC, like Greenwich Mean Time, is set at 0 degrees longitude on the prime meridian.
Short for Universal Transformation Format, a method of converting Unicode characters, which are 16 bits each, into 7- or 8-bit characters. UTF-7 converts Unicode into ASCII for transmission over 7-bit mail systems, and UTF-8 converts Unicode to 8-bit bytes.
- Unshielded Twisted Pair U(TP)
Short for unshielded twisted pair, a popular type of cable that consists of two unshielded wires twisted around each other. Due to its low cost, UTP cabling is used extensively for local-area networks (LANs) and telephone connections. UTP cabling does not offer as high bandwidth or as good protection from interference as coaxial or fiber […]
Short for Universal Terrestrial Radio Access, UTRA is a standard for 3G mobile communications services being specified by 3GPP. The radio access components of UTRA are based on direct-spread wideband code-division multiple access (WCDMA) and hybrid time-division (TDCDMA) access methods that have been designed for 3G frequency efficiency, mobility, and QoS requirements.
Short for Unix-to-Unix Copy, a Unix utility and protocol that enables one computer to send files to another computer over a direct serial connection or via modems and the telephone system. For most file transfer applications, UUCP has been superseded by other protocols, such as FTP, SMTP and NNTP.
Short for Universally Unique IDentifier, UUID is a 128-bit value used for identification used in software construction. UUID is the same as GUID (Microsoft) and is part of the Distributed Computing Environment (DCE), standardized by the Open Software Foundation (OSF). UUIDs are intended to have a high likelihood of uniqueness over space and time and […]