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T-1 :
A leased-line connection capable of carrying data at
1,544,000 bits-per-second. At maximum theoretical
capacity, a T-1 line could move a megabyte in less than
10 seconds. That is still not fast enough for full-screen,
full-motion video, for which you need at least 10,000,000
bits-per-second. T-1 lines are commonly used to connect large
LANs to the Internet.
T-3 :
A leased-line connection capable of carrying data at
44,736,000 bits-per-second. This is more than enough to do
full-screen, full-motion video.
Telnet :
The command and program used to login from one
Internet site to another. The telnet command/program gets
you to the login: prompt of another host.
Terabyte :
1000 gigabytes.
Terminal :
A device that allows you to send commands to a computer
somewhere else. At a minimum, this usually means a keyboard
and a display screen and some simple circuitry. Usually you
will use terminal software in a personal computer - the
software pretends to be (emulates) a physical terminal and
allows you to type commands to a computer somewhere else.
Terminal Server :
A special purpose computer that has places to plug in many
modems on one side, and a connection to a LAN or
host machine on the other side. Thus the terminal server
does the work of answering the calls and passes the
connections on to the appropriate node. Most terminal
servers can provide PPP or SLIP services if
connected to the Internet.
TLD:
(Top Level Domain) The last (right-hand) part of a complete
Domain Name. For example in the domain name
www.discoverscs.com ".com" is the Top Level Domain.
There are a large number of TLD's, for example .biz, .com, .edu,
.gov, .info, .int, .mil, .net, .org, and a collection of
two-letter TLD's corresponding to the standard two-letter
country codes, for example, .us, .ca, .jp, etc.
TFT :
Thin layer Transistor. Transistor type used in active matrix
screens in laptop computers. Layers of TFT and condensers are
put on a glass containing RGB filters.
TCP/IP :
Transmission Control Protocol/Internet Protocol. TCP/IP is a
set of protocols for Layers 3 an 4 of the seven-layer Open
Systems Interconnection network model. These are,
respectively, the network and the transport layers. TCP/IP has
been developed under the auspices of the Department of
Defense. It has achieved de facto standard status,
particularly as higher-level layers including IBM, Digital
Equipment Corp., AT&T, Apollo, Data General and Sun
Microsystems. But its exclusion from Systems Application
Architecture means that IBM views TCP/IP as a special-purpose
protocol set. The biggest issue for TCP/IP is potential
migration to the International Standards Organization
protocols for Layers 3 and 4.
Token Ring :
LAN topology and access method promoted by IBM. Curiously
invented for dumb terminal connection purpose, this
architecture has been definitely outdated by Ethernet.
TPC-A :
Transaction Processing Performance Council. A revised and
superior version of the debit/credit on-line transaction
processing (OLTP) benchmark. The major improvements in TPC-A
were the requirements for full disclosure and the inclusion of
the front-end network and terminals. TPC-A is intended to
replace debit/credit as the only industry wide measure for
OLTP performance and price/performance. It is good test since
it measures end-to-end performance, but it still is only one
test reflecting a single type of transaction.
Tps :
transactions per second. The metric used in evaluating on-line
transaction processing system performance. Tps are typically
measured under conditions of a specified percentage of
standard transactions completed in under a specified response
time.
Track :
Circular recording zone on a diskette or hard disk. Tracks
generally are generally composed of sectors.
Transaction :
A logical update that takes a database from one consistent
state to another.
Transport Layer :
In the Open Systems Interconnection (OSI) model, the network
processing entity responsible, in conjunction with the
underlying network, data link and physical layers, for the
end-to-end control of transmitted data and the optimized use
of network resources.
Trojan Horse :
A computer program is either hidden inside another program or
that masquerades as something it is not in order to trick
potential users into running it. For example a program that
appears to be a game or image file but in reality performs
some other function. The term "Trojan Horse" comes from a
possibly mythical ruse of war used by the Greeks sometime
between 1500 and 1200 B.C.
A Trojan
Horse computer program may spread itself by sending copies of
itself from the host computer to other computers, but unlike a
virus it will (usually) not infect other programs.
Two-Phase Commit :
Method for coordinating a single transaction across two or
more database management systems or other resource managers.
Two-phase commit guarantees the logical integrity of data by
ensuring that transaction updates are finalized ("committed")
in all of the separate databases or are fully backed out of
all participating databases, i.e., all or nothing based on
transaction boundaries. Two-phase commit is a necessary
component of distributed database and is implemented in
"transaction management" software, which may be part of a
database management system, on-line transaction processing
monitor, or front-end application tool. |
