T

Tag

In HTML terms, a 'tag' is used for marking-up text in various ways so that it is formatted in a Web document. They are sometimes called 'Markup Tags'.

Also see HTML

T-1

Network link used on the Internet allowing speeds of up to 1.54 megabits/second.

Also see ADN

T-3

Higher speed (45 megabits/second) Network link used on the Internet.

Also see ADN

TCP

(Transmission Control Protocol) works in conjunction with IP to ensure that packets reach their intended destinations.

Also see Packet Protocol TCP/IP

TCP/IP

(Transmission Control Protocol/Internet Protocol). This is the name for two of the most well-known protocols developed by the U.S. Department of Defense in the 1970s to allow equipment from different vendors to communicate. Originally a UNIX standard, TCP/IP is now supported on almost all platforms, and is the protocol of the Internet.

IP represents the scheme by which two devices (both with IP addresses) communicate. TCP manages the flow of IP packets, ensuring that the packets remain error-free and reach their destination correctly.

Also see Internet Internetwork IP Network Node Packet Protocol UNIX

Telnet

Terminal emulation program allowing an authorised user to access another computer on the Internet and use that computer as if it were local (when in reality it could be several thousand miles away).

Terabyte

1000 gigabytes

Also see Byte Gigabyte Kilobyte Megabyte

Terminal

Piece of hardware that allows commands to be sent to a computer, usually by means of a keyboard and display unit.

Terminal Adapter

A device used in an ISDN network to connect a single user to the outside world.

Also see ISDN

Terminal Emulator

Allows a PC to emulate several terminal types

text entity

An entity that associates character data with an entity name.

text properties

In CSS, text properties are the collection of properties and values that control the text specifies for elements within the document.

Also see CSS

Thread

In a Usenet group, this is a list of messages loosely relating to one another (using the same 'thread').

TIA

Telecommunications Industry Association. A telecommunications standards organization founded in 1988 in America. The TIA was formed from a spin-off group from the EIA (Electronic Industries Association) to set global telecommunications standards, such as EIA/TIA-232.

Also see EIA

Timeout

The facility whereby after a certain period of inactivity the connection is dropped.

Token Ring

Developed by IBM, Token Ring offers a method to connect devices in a LAN (local area network). Hence, Token Ring offers the same service as Ethernet, implemented in a different manner: an electronic token (a data packet) is passed around stations in a ring. Most small businesses install Ethernet networks, due to their comparative simplicity to Token Ring.

Token Ring networks take on the physical appearance of a star, but actually operate as a logical ring. A device (such as a PC) takes possession of the token, transmits its data, then frees the token after the data has made a complete circuit of the electrical ring.

The IEEE 802.5 standard specifies the wiring on which Token Ring operates (STP, UTP or fiber-optic cable); Token Ring operates at either 4 or 16Mbps.

Also see Ethernet Fibre Optic Cable IEEE LAN Mbps Network Packet PC STP UTP

Tradacoms

An EDI message standard developed by the ANA

Tradanet

Tradanet is the name of a VAN run by GEIS.

Traffic

Movement of data packets on a network.

Also see Network Packet

Translation (EDI)

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Transceiver

A device that transmits and receives digital and analog signals. In networking, a transceiver is a device that connects an interface to a local area network (LAN). Transceivers can be standalone units, or incorporated into a circuit board within a computer. They are usually used to connect media of different types, for example, thick coaxial cable to an AUI.

Also see Ethernet LAN Network Traffic

Twisted Pair

A pair of thin wires commonly used for telephone wiring and computer networks. The wires are twisted around each other to minimize interference from other cables.

The two major types of twisted pair are shielded twisted pair (STP) and unshielded twisted pair (UTP). UTP is popular because it is thinner and doesn't take up much room, but STP has added protection against electromagnetic interference.

Also see Bandwidth Fibre Optic Cable Network STP UTP