Resources: IT World Glossary

UDP

User Datagram Protocol, the portion of the TCP/IP suite of networking protocols that does not allow for handshaking to ensure packet delivery as it is not always necessary, called "unreliable."

UID

Unique Identifiers

UL

Upper Layer protocol. Plugs into a TCP port in order to communicate. The UL encompasses the upper three layers of the OSI model and provides a means to connect to the DICOM application entities and the device itself. Also, the device-to-device handshaking for communication happens at the UL.

UL

Underwriters Laboratories

URL

Uniform Resource Locator

USB

Universal Serial Bus - usually an external connector to connect to all kinds of peripherals (i.e. scanners, digital cameras).

UTP

Unshielded Twisted Pair