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Term
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Description
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U (User) Reference Point
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The interface between the ISDN customer premises equipment
and the public ISDN network. This interface defines a point
to point connection using a single twisted pair and 2B1Q data
coding.
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UADSL
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Universal ADSL
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UART
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Universal Asynchronous Receiver Transmitter. Serial data
protocol that transfers data at set data (baud) rates. These
data rates are based on transitions of the data at set time
periods; no clock is transmitted between the transmitter and
receiver.
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UDP
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User Datagram Protocol. The connectionless protocol within
TCP/IP that corresponds to the transport layer in the ISO/OSI
model. UDP converts data messages generated by an application
into packets to be sent over IP, but does not verify that
messages have been delivered correctly.
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UNH - IOL
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University of New Hampshire - InterOperability Lab well known
for its work in verifying interoperability between classes
of networking devices.
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Universal ADSL
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Another name for G.Lite Also the name of the working group
that developed it.
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Unshielded twisted pair
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Unshielded, is the the first type of a twisted pair Ethernet
cable. There are different types of UTP available(Cat 3, 4,
5, 5e, 6, and 7) . Category 1 & Category 2 are not suitable
for use with Ethernet Transmission frequency rate is what
differentiate them.
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UPnP
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Universal Plug and Play. A cross-industry initiative to simplify
the interconnection of PCs, appliances, networks and services
by extending Plug and Play to include networks, move to a
peer model, and incorporate capabilities discovery. Universal
Plug and Play will discover devices on a network and also
enumerate each device's unique characteristics, including
communications protocols.
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Upstream
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Data transmitted from the modem to the Internet
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USB
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Universal Serial Bus. A bi-directional, isochronous, dynamically
attachable Serial interface for adding peripheral devices
such as game controllers, Serial and parallel ports, and input
devices on a single bus. (This Serial protocol runs at 1-12
Mbps.) A newer style of bus and connector for attaching peripheral
devices such as keyboards, scanners, cameras or speakers to
a PC. The connector on the back of the PC looks like a flat
telephone jack, and when you plug in a new USB device, most
PCs running Windows* 98 can detect it automatically and begin
using it without the need to reboot the system (plug and play).
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USB
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Universal Serial Bus - Standard for Serial transmission between
a computer and peripherals. Supports up to 12 Mbps and plug-and-play.
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USB
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Acronym for Universal Serial Bus. Peripheral standard for
Serial transmission supporting plug-and-play.
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Utilization
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Percentage of resources used in the device. The resources
are: logic cells, block RAM, IO blocks, flip-flops and interconnect.
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UTOPIA
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Universal Test & Operations Interface for ATM - Refers
to an electrical interface between the sublayers of the PHY
layer.
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UTP
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Unshielded Twisted Pair
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