Alcatel-Lucent AOS-W 6.5.3.x - Page 1155

1155| Glossary of Terms AOS-W 6.5.3.x| User Guide
UDP
User Datagram Protocol. UDP is a part of the TCP/IP family of protocols used for data transfer. UDP is
typically used for streaming media. UDP is a stateless protocol, which means it does not acknowledge that the
packets being sent have been received.
UDR
User Derivation Rule. UDR is a role assignment model used by the controllers running ArubaOS to assign
roles and VLANs to the WLAN users based on MAC address, BSSID, DHCP-Option, encryption type, SSID, and
the location of a user. For example, for an SSID with captive portal in the initial role, a UDR can be configured
for scanners to provide a role based on their MAC OUI.
UHF
Ultra high frequency. UHF refers to radio frequencies between the range of 300 MHz and 3 GHz. UHF is also
known as the decimeter band as the wavelengths range from one meter to one decimeter.
UI
User Interface.
UMTS
Universal Mobile Telecommunication System. UMTS is a third generation mobile cellular system for networks.
See 3G.
UPnP
Universal Plug and Play. UPnp is a set of networking protocols that permits networked devices, such as
personal computers, printers, Internet gateways, Wi-Fi APs, and mobile devices to seamlessly discover each
other's presence on the network and establish functional network services for data sharing, communications,
and entertainment.
URI
Uniform Resource Identifier. URI identifies the name and the location of a resource in a uniform format.
URL
Uniform Resource Locator. URL is a global address used for locating web resources on the Internet.
USB
Universal Serial Bus. USB is a connection standard that offers a common interface for communication
between the external devices and a computer. USB is the most common port used in the client devices.
UTC
Coordinated Universal Time. UTC is the primary time standard by which the world regulates clocks and time.
UWB
Ultra-Wideband. UWB is a wireless technology for transmitting large amounts of digital data over a wide
spectrum of frequency bands with very low power for a short distance.
VA
Virtual Appliance. VA is a pre-configured virtual machine image, ready to run on a hypervisor.