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U
UDP — User Datagram Protocol. In TCP/IP, a connectionless transport
layer protocol that exchanges datagrams without acknowledgments or
guaranteed delivery, requiring that error processing and retransmission
be handled by other protocols.
U interface — User reference point interface. A single–pair connection
between the local ISDN provider and the customer premises equipment.
UME — UNI management entity. The code residing in the ATM devices
at each end of a UNI (user-to-network interface) circuit that functions
as an SNMP agent, maintaining network and connection information
specified in a MIB.
UMTS — Universal mobile telecommunications system. Provides third-generation
(3G), packet-based transmission of text, digitized voice, video, and
multimedia, at data rates up to 2 Mbps.
UMTS Terrestrial Radio Access Network — See UTRAN.
UNI — User-to-network interface. ATM Forum specification that defines
an interoperability standard for the interface between a router or
an ATM switch located in a private network and the ATM switches located
within the public carrier networks. Also used to describe similar
connections in Frame Relay networks.
unicast — Operation of sending network traffic from one network node to
another individual network node.
UNI management entity — See UME.
uninterruptible power supply — See UPS.
unit — JUNOS software syntax that represents the logical properties
of an interface.
universal mobile telecommunications system — See UMTS.
unnumbered interface — Logical interface that is configured without an IP address.
Update message — BGP message that advertises path attributes and routing knowledge
to an established neighbor.
update timer — Used in a distance-vector protocol to advertise routes to a
neighbor on a regular basis.
UPS — Uninterruptible power supply. A device that sits between a power
supply and a router or other device and prevents power-source events,
such as outages and surges, from affecting or damaging the device.
upto — JUNOS software routing policy match type representing all routes
that share the same most–significant bits and whose prefix length
is smaller than the supplied subnet in the route filter.
User Datagram Protocol — See UDP.
UTC — Coordinated Universal Time. Historically referred to as Greenwich
Mean time (GMT), a high-precision atomic time standard that tracks
Universal Time (UT) and is the basis for legal civil time all over
the Earth. Time zones around the world are expressed as positive and
negative offsets from UTC.
UTRAN — UMTS Terrestrial Radio Access Network. The WCDMA radio network
in UMTS.
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