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| INTERNET DICTIONARY - LETTER "T" | |
| 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 is the fastest speed commonly used to connect networks 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. |
| TAC | See: Terminal Access Controller (TAC) |
| tag | A tag is used to describe a type of command or instruction usually in regards to HTML or Web page code. HTML tags always have a pair of brackets surrounding the specific instruction. |
| talk | A protocol which allows two people on remote computers to communicate in a real-time fashion. See also: Internet Relay Chat. |
| TANSTAAFL | There Ain't No Such Thing As A Free Lunch - A shorthand appended to a comment written in an online forum. |
| TCP | See: Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol is a combined set of protocols that performs the transfer of data between two computers. TCP monitors and ensures correct transfer of data. IP receives the data from TCP, breaks it up into packets, and ships it off to a network within the Internet. TCP/IP is also used as a name for a protocol suite that incorporates these functions and others. |
| TELENET | A public packet switched network using the CCITT X.25 protocols. It should not be confused with Telnet. |
| TELNET | A portion of the TCP/IP suite of software protocols that handles terminals. Among other functions, it allows a user to log in to a remote computer from the user's local computer. |
| TCP/IP | Transmission Control Protocol/Internet Protocol - This set of protocols makes TELNET, FTP, e-mail, and other services possible among computers that don't belong to the same network. |
| technophile | An ardent supporter of technology, who first emerged during the Computer Revolution of the '70s. |
| Telnet | An Internet program for connecting to a remote host or server. The Telnet interface is text based and a user usually has to enter their login name and password before gaining access to the system. Some of the things you can do with Telnet access include: check your e-mail, download a program, or chat with other Telnet users. It is one of the oldest Internet activities and is primarily used to access online databases or to read articles stored on university servers. It is also possible to Telnet via your Web browser by changing the http:// to telnet:// and entering in the site's address. |
| 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 Access Controller (TAC) | A device which connects terminals to the Internet, usually using dialup modem connections and the TACACS protocol. |
| terminal emulation | There are several methods for determining how your keystrokes and screen interact with a public-access site's operating system. Most communications programs offer a choice of "emulations" that let you mimic the keyboard that would normally be attached directly to the host-system computer. A program that allows a computer to emulate a terminal. The workstation thus appears as a terminal to the remote host. |
| 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. |
| thread | In a USENET newsgroup, a chain of postings on a single subject. Most newsreaders include a command that let you follow the thread, that is, jump to the next message on the topic rather than display each message in sequence. Popular newsreaders, such as NewsXpress and WINVN, have a thread selector that allow you to sort articles by threads. Indentation is often used to indicate a response to an article positioned above it. |
| Three Letter Acronym (TLA) | A tribute to the use of acronyms in the computer field. See also: Extended Four Letter Acronym. |
| thumbnail | Describes the size of an image you frequently find on Web pages. Usually photo or picture archives will present a thumbnail version of it's contents (makes the page load quicker) and when a user clicks on the small image a larger version will appear. Sometimes these links will be to a new page containing the larger graphic and other times right to the image directly, as is the case in the examples below. |
| TIFF | Tagged Image File Format - a graphic file format developed by Aldus and Microsoft. Mosaic supports the viewing of TIFF images. |
| ~ or tilde | Prounounced "tilda," this scribbly horizontal line has come to signify an individual user's Web site when housed on the server of an ISP. In real terms the tilde stands for a path which leads to that person's Web site on the server it is being kept. For example, http://www.best.com/~erinj - says that erinj is a best.com user and that her homepage is on best.com's server. When you look at the server you will notice that erinj's Web site is really located on the path: www.best.com/www/users/erinj , therefore the tilde is used to bypass the /www/users directories to make the URL or "Web address" a little shorter and easier to remember. The tilde character is on the top line of your keyboard to the far left. |
| Time to Live (TTL) | A field in the IP header which indicates how long this packet should be allowed to survive before being discarded. It is primarily used as a hop count. See also: Internet Protocol. [Source: MALAMUD] |
| TLA | See: Three Letter Acronym |
| TN3270 | A variant of the Telnet program that allows one to attach to IBM mainframes and use the mainframe as if you had a 3270 or similar terminal. [Source: BIG-LAN] |
| token ring | A token ring is a type of LAN with nodes wired into a ring. Each node constantly passes a control message (token) on to the next; whichever node has the token can send a message. Often, "Token Ring" is used to refer to the IEEE 802.5 token ring standard, which is the most common type of token ring. See also: 802.x, Local Area Network. |
| topology | A network topology shows the computers and the links between them. A network layer must stay abreast of the current network topology to be able to route packets to their final destination. [Source: MALAMUD] |
| transceiver | Transmitter-receiver. The physical device that connects a host interface to a local area network, such as Ethernet. Ethernet transceivers contain electronics that apply signals to the cable and sense collisions. [Source: RFC1208] |
| transit network | A transit network passes traffic between networks in addition to carrying traffic for its own hosts. It must have paths to at least two other networks. See also: backbone, stub network. |
| Transmission Control Protocol (TCP) | An Internet Standard transport layer protocol defined in STD 7, RFC 793. It is connection-oriented and stream-oriented, as opposed to UDP. See also: connection-oriented, stream-oriented, User Datagram Protocol. See Introduction to Protocols |
| Trojan Horse | A computer program which carries within itself a means to allow the creator of the program access to the system using it. See also: virus, worm. See RFC 1135. |
| TrueSpeech | A Netscape Navigator plugin which allows real time audio over the Internet. |
| Trumpet Winsock | A popular Windows 3.1 and Windows 95 TCP/IP stack that provides a standard networking layer for many networking applications to use. |
| TTFN | Ta Ta For Now - A shorthand appended to a comment written in an online forum. |
| TTL | See: Time to Live |
| tunnelling | Tunnelling refers to encapsulation of protocol A within protocol B, such that A treats B as though it were a datalink layer. Tunnelling is used to get data between administrative domains which use a protocol that is not supported by the internet connecting those domains. See also: Administrative Domain. |
| twisted pair | A type of cable in which pairs of conductors are twisted together to produce certain electrical properties. |
