Multimedia Glossary: T

T1 and T3

These terms are used for American communication lines with the following bandwidth:

Line	Bandwidth
T1	1.544Mb/sec
T2	45Mb/sec

Other countries use Diginet standards available in blocks of 64K.

Tagged Image File Format

See TIFF

telnet

This method is used for accessing a remote computer and use it as if it is the one right in front of you. The interface is text-based (on the command line), so you do not see the windows of the remote system.

TCP

Transmission Control Protocol

TCP is defined by RFC793. It is connection-oriented with a guaranteed delivery protocol.

TCP connects different services to their apprropriate ports on a server. For example, TCP would deliver Telnet requests to port 23. The web's datagram protocol (IP) runs "on top of" TCP.

TCP protocol (as well as the UDP) ensures the safe transmission of data between two hosts. Information is transmitted in packets. There are two kinds of TCP connections:

Connectionless: delivery is not guaranteed. This is like a CB radio call. When you make such a call you hope somebody hears you, but you cannot be sure that anybody is listening. Similarly, when your computer makes a connectionless TCP call there is no guarantee there will be an answer.

Connection-oriented: delivery is guaranteed. This kind of TCP first makes a connection contact, and when that is established, it sends the message. The connection is thus verified before it is sent, and connection is only shut off once the addressee responds back that it has received the data.

In other words, a message is sent to the addressee (the client), telling it how many packets of data it must receive. This addressee lets the sender (the server) know whether it has received all the information. After each packet is received it lets the server know "OK, I've received this" or "Wait! I have not received packet number 3, please resubmit". Because of this verification procedure, connection-oriented data transmission takes much longer to transmit data. But there is a major advantage. You do not have to wait for the entire file to load before you realize that the connection has been broken.

Top

TCP/IP

The TCP and IP protocols in combination is the basic protocol of The Internet.

TIFF

Tagged Image File Format

TIFF is an image file format system used in graphic programs. TIFF is a compressed bitmap format.

Timeline

Timebased media progress along as time passes. During the production of such media it is important for an editor to know where in this laps of time a particular instance of an object (visual or audio) is located. Production material is therefore mapped to some or other timeframe, which is visually presented as a line. The basis of the timeframe is usually real time in hours, minutes, seconds, milliseconds.

Macromedia Flash uses the term timeline in the above sense, while Macromedia Director uses the term score, which is quite misleading.

Top

Tint

The tint of a color refers to the result of adding white to a pure color hue. The primary color is thus tinted.

TLD

Top Level Domain

Top Level Domains are domain names that serve as the first level for resolving the names of IP addresses. For years the TLDs have been the following:

• com: commercial
• edu: education (colleges and universities)
• gov: government
• mil: military
• net: networks
• org: nonprofit organizations

From 2001 the following TLDs have been added to the above:

• biz: business
• info: information
• pro
• name
• aero
• coop
• museum

TLD

Top Level Domain

See TLD

Traceroute

Traceroute is a utility enabling one to trace the route that packets of data take from one server to another and eventually the client. Each time the packet is routed, the address is noted. Traceroute thus registers each hop that data takes along the internet path from the origin server to the client.

Transmission Control Protocol

See TCP

Transparency

Images in the computer environment are always square or rectangular. The illusion that an image is not rectangular can be created by making some areas of the image transparent. Transparency is a feature of graphic images where some parts of the color palette can be set as being transparent. As no color is then present, the transparent part of the images let the background on which the image is placed, to "shine" through.

Tweening

In the early days of animation the senior animation designer would draw the major frames where changes would take place. Assistant animators would then draw details of each of the frames in between these main changes.

Macromedia Flash mimics this by allowing the animator to draw the first and last frame of a sequence (called the keyframes), while Flash would complete all the intermediate frames.

Top