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EXFO Glossary

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U_PortUniform Resource Locator (URL)USB
UASUniversal Serial Bus (USB)User Datagram Protocol (UDP)
UDPUnshielded Twisted Pair (UTP)User Network Interface (UNI)
ULPUPCUser Plane
Unicast AddressURL
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Acronym for: Universal port


Acronym for: Unavailable second


Acronym for: Upper-layer protocol

Unicast Address

An address that is assigned to uniquely identify a single station on a network.

Uniform Resource Locator (URL)

The specific character string of an Internet resource comprised of a protocol, server, domain and other identifiers.

Universal Serial Bus (USB)

A computer interface offering bandwidths of 1.5/12/480/5000 Mbit/s used for connecting computer peripherals such as printers, keyboards and scanners.

Unshielded Twisted Pair (UTP)

Twisted pair cabling that includes no shielding. UTP most often refers to the 100 Ω, Category 3, 4, and 5 cables specified in the TIA/EIA 568-A standard.


Acronym for: Ultra-polished connector


Acronym for: User payload identifier

User Datagram Protocol (UDP)

One of the core members of the Internet protocol suite, which is the set of network protocols used for the Internet.

User Network Interface (UNI)

A demarcation point between the responsibility of the service provider and the responsibility of the subscriber.

User Plane

The user plane (also known as data plane) is the component of a network that carries the user traffic.