U

UART Universal Asynchronous Receiver/Transmit chip, used as communications (COM) port in personal computers. Maximum data rates vary with model; the National Semiconductor 16550A

UDLC Universal Data Link Control

UDP (User Datagram Protocol) Internet standard protocol that allows an application on one machine to send a datagram to an application program on another machine.

U Interface A U interface is a two wire interface presented to the customer by the telco in the US market. The customer is responsible for converting this signal to the four wire S/T interface in order to make a connection.

UKERNA United Kingdon Education and Research Networking Association.

UNI User-to-Network Interface

URL Uniform Resource Locator. Standardized format for specifying a network service or document within an HTML document.

Usenet The global news-reading network.

UTP Unshielded Twisted Pair See STP.

UUCP Unix-Unix Copy Protocol. A method of exchanging data between to unix machines.