|
Term
|
Description
|
|
T (Terminal) Reference Point
|
The ISDN interface between an NT1 and NT2. It is functionally
equivalent to the S interface.
|
|
T1
|
The most common data link in the US communications network.
It is best known as a multiplexed carrier of 24 64-Kbps voice
channels plus overhead, or 1.544 Mbps.
|
|
T3
|
US digital transmission service containing 28 T1 circuits,
with a basic data rate of 44.736 Mbps.
|
|
TA (ISDN)
|
Terminal Adapter
|
|
TA (Terminal Adapter)
|
Adapts non-ISDN equipment to ISDN.A TA provides an R interface
for the non-ISDN equipment and an S/T interface for connection
to the ISDN network.
|
|
TCP
|
Transport Control Protocol.
|
|
TCP/IP
|
Transmission Control Protocol/Internet Protocol is the basic
communication protocol of the Internet TCP/IP has two layers.
The higher layer, or Transmission Control Protocol, manages
the assembling of a message or file into smaller packets.
These packets are transmitted over the Internet and received
by a TCP layer that reassembles the packets into the original
message. The lower layer, Internet Protocol, handles the address
part of each packet so that it gets to the right destination.
Each gateway computer on the network checks this address to
see where to forward the message. Even though some packets
from the same message are routed differently than others,
they'll be reassembled at the destination.
|
|
TDM
|
Time Division Multiplexing, a type of multiplexing that combines
data streams by assigning each stream a different time slot
in a set.
|
|
TDMA
|
Time Division Multiple Access. Data multiplexing scheme used
as the basis for all digital switching networks and Central
Office switches. Each 8 kHz sample of an analog signal from
a given phone line or channel is coded into 8 bits of digital
information. These are then time multiplexed into successive
bytes of data within a digital bus or channel of data. A digital
radio technology that divides each frequency channel into
separate time slots for separate conversations or sessions.
A digital multiplexing technique whereby each signal is sent
and received at a fixed time slots in a series of time slots.
The transmitter and receiver must be time-synchronized. Most
public telephone networks typically use TDMA.
|
|
TE (ISDN)
|
Terminal Equipment
|
|
TE1 (Terminal Equipment 1)
|
ISDN terminal equipment such as ISDN telephones. These devices
interface to the ISDN network by way of an S interface.
|
|
TE2 (Terminal Equipment 2)
|
Non-ISDN terminal equipment such as personal computers. These
devices interface to a TA by way of an R interface.
|
|
Telco
|
Local telephone company.
|
|
Telephony
|
Telephone technology. The conversion of sound into electrical
signals, its transmission to another location, and its reconversion
to sound, with or without the use of connecting wires is called
telephony.
|
|
Test Bench
|
An HDL file used in simulation to test the operation of a
design.
|
|
Test vectors
|
Input signals used to test the functionality of a device.
|
|
Throughput
|
A measure of the volume/amount of data which can be transmitted
(typically per second) through a given communications system.
|
|
TIA TR41.5
|
Telecommunications Industry Association (TIA) TR41.5. Goal
is to create the physical layer spec for interfacing between
different WAN & home networking technologies.
|
|
Time Division Multiplexing (TDM)
|
Equipment which enables the transmitting of a number of signals
over a single common path by transmitting them sequentially
at different instants of time.
|
|
Timing Analyzer
|
Software application that determines the timing characteristics
of a design, but does not test for functionality.
|
|
Timing constraints
|
Method used to increase the speed of a design by defining
the timing requirements.
|
|
Timing Simulation
|
Software process of verifying the functionality of a design
that includes the device timing characteristics.
|
|
Toner
|
A special type of ink used by copy machines and laser printers.
Toner consists of a dry, powdery substance that is electrically
charged so that it adheres to a drum, plate, or piece of paper
charged with the opposite polarity.
|
|
Toner Cartridge
|
A cartridge or cassette which holds toner for ease of loading
into a printer.
|
|
TQFP
|
Acronym for Thin Quad Flat Pack. Low profile, surface mount
package.
|
|
TRACE
|
Xilinx application in Foundation ISE, Foundation and Alliance
that determines how fast a design can run.
|
|
Transceiver
|
A combination radio transmitter and receiver.
|
|
Transponder
|
A satellite is divided up in parts called transponders. A
transponder is one distribution channel of the satellite.
Each transponder can be used for distribution of several programs.
|
|
transport
|
Guarantees reliable delivery between end stations
|
|
Transport layer
|
The Transport Layer is generally called the higher layer
as to how traffic is moved. It ensures the performance of
the lower 3 OSI layers. The Transport Layer forms the interface
between the higher application-oriented layers and underlying
network-dependent protocol layers. It provides the session
layer with reliable message transfer facilities. It offers
transparent transfer of data between end stations or edge
nodes, error recovery, and flow control.
|
|
Triple-DES
|
Reading locations directly without having to read in a particular
sequence.
|
|
tristate buffer
|
see 3-state
|
|
Truck rolls
|
The process of having support people from utilities, industries
visit the home to deploy services such as a residential gateway,
digital modems, meter reading, etc. These truck rolls are
usually very costly.
|
|
True Black
|
Black produced by a separate black ink rather than the 'composite
black' produced from a mixture of cyan, magenta and yellow.
See also Composite Black.
|
|
True DualPort RAMTM
|
See Dual Port RAM
|
|
TrueType
|
A font definition format for outline fonts which is used
by Microsoft Windows for the creation of screen fonts and
downloaded fonts.
|
|
TTL
|
Acronym for Transistor Transistor Logic. The 7400 series
of logic fabricated with bipolar transistors.
|
|
Turnaround cycle
|
The turnaround cycle is a "dead" bus cycle to prevent bus
contention.
|
|
TwinVQ (Transform-domain Weighted
Interleave Vector Quantization)
|
Developed by NTT Human Interface Labs in Japan, this new
compression technology is called Transform-Domain Weighted
Interleave Vector Quantization, or TwinVQ. This compression
technology, targeted at download applications, was originally
developed by Yamaha and has been incorporated, along with
AAC, into the MPEG-4 specification. The underlying algorithms
are significantly different the algorithms used in MPEG layer
III.
|
|
Twisted Pair Cable
|
There are 3 major types of Twisted Pair Cables ( Shielded,
Unshielded, and Screen Twisted). In Twisted Pair cables, pairs
of wires are twisted around one another. Each pair consists
of two insulated copper wires twisted together. The wire pairs
are twisted because it helps reduce crosstalk and noise susceptibility.
High quality twisted pair cables have about 1 to 3 twists
per inch. Twisted pair cables are used with the following
Ethernet physical layers: 10Base-T, 100Base-TX, 100Base-T2,
100Base-T4, and 1000Base-T.
|
| |
|
|
