To use the glossary, simply click below on the first letter of the term of interest:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

T

T1

The AT&T Bell System level 1 digital transmission system operating at 1.544 Mbps (1.536 Mbps excluding framing). T1 is commonly used to refer to DS1.

T3

The AT&T Bell System level 3 digital transmission system operating at 44.736 Mbps (commonly referred to as 45 Mbps). T3 is commonly used to refer to DS3.

T.120 (suite specification)

An ITU-T overview recommendation for multimedia conferencing describing Transmission Protocols for Multimedia Data; including multilayer protocols to considerably enhance multimedia, MCU and codec control capabilities, permitting greater MCU operational sophistication beyond that described in H.231 and H.243.

T.121

ITU-T recommendation describing a generic application template.

T.122

ITU-T recommendation describing a multipoint communication service (MCS) for audiographic and audiovisual conferencing — service definition document.

T.123

ITU-T recommendation describing network-specific data protocol stacks for multimedia teleconference applications.

T.124

ITU-T recommendation describing Generic Conference Control for audio-visual and audiographic terminals.

T.125

ITU-T recommendation describing a multipoint communication service protocol specification.

T.126

ITU-T recommendation describing multipoint still image [Conferencing] and annotation protocol specification.

T.127

ITU-T recommendation describing multipoint binary file transfer protocol specification.

T.128

ITU-T recommendation describing multipoint application sharing specifications.

T.130 (Suite description)

ITU-T T.13x recommendations describe real-time architecture for multimedia conferencing. This suite of standards introduces such concepts as virtual networks, virtual and distributed MCUs and many more innovative new network architecture approaches for voice, video, graphics, data etc. Fully supports T.120 suite and a variety of coding and transmission methods.

T.131 ?

ITU-T recommendation describing Real-Time Stream Multipoint Communications Service.

T.132 ?

ITU-T recommendation describing Real-time Link Management.

T.133 ?

ITU-T recommendation describing an Audio-Video Control Applications Protocol.

T.134

ITU-T recommendation describing a text chat application entity.

T.135

ITU-T recommendation describing user to reservation system transactions within T.120 conferences.

T.136

ITU-T recommendation describing a remote device control application protocol.

T.137

ITU-T recommendation describing virtual meeting room management – services and protocol.

T.140

ITU-T recommendation describing a protocol for multimedia application text conversation.

Tail time

In acoustic echo cancellers, telephony echo cancellers and related devices, the sampling window size (in milliseconds) used for the electroacoustic model of all the echo sources. Related to the more complex AFIRF "taps" parameter.

TCP/IP

Transmission Control Protocol/Internet Protocol. Networking protocols providing communications across interconnected networks (including Internet and Intranets). The networks may incorporate diverse hardware architecture computers and various operating systems. TCP/IP includes communication, connection and routing standard protocols.

TDD

Time Division Duplex, part of DECT modulation scheme.

TDM

Time-Division Multiplex, the sharing of a transmission network by a number of users versus time.

TDMA

Time-Division Multiple Access, the sharing of a satellite transmission network by a number of locations versus time.

TEC

Telephony Echo Canceller, an echo canceller used to eliminate echoes on the line side of AECs and other telecommunications voice equipment.

Telco

Jargon for TELephone COmpany.

Temporal Filtering

In video compression, the recursive removal of redundant pixels on a frame-to-frame basis, a major factor controlling final image quality.

Timebase Corrector (TBC)

A time domain jitter removal device used in conjunction with a playback from a VCR. It provides sufficient timing stability to permit successful encoding of the video signal by a video codec. Some codecs include a built-in TBC.

TTL

Transistor-Transistor Logic. A type of integrated circuit with nominal logic levels of +5 and 0 volts. These logic levels are often specified for digital data and control signals that connect codecs and other communications equipment.

Thread-of-Life Communications

Emergency telecommunications facilities, generally of a substandard nature and where only minimal communications facilities or bandwidth are available. For example, videoconferencing at 19.2 Kbps will provide visual identification of a talker under wartime conditions in the bandwidth equivalent to one-third of a regular G.711 telephone voice circuit.

TQM, Total Quality Management

A corporate philosophy or mindset focused on quality, a precursor of ISO 9000.

Transcoder

Hardware or software that converts between algorithms, protocols or standards.

Transponder (satellite usage)

Part of a communications satellite that receives a signal from the earth, amplifies it, converts it to a lower frequency and re-transmits it back to the earth. Each transponder is essentially a broad-band amplifier with a bandwidth of about 36 MHz and a transmit power ranging from a few watts to hundreds of watts depending upon the application. Each transponder can carry thousands of telephone conversations or one to many television channels. Satellites include a number of transponders with 16 to 48 being typical of different applications.

TVRO

TeleVision Receive-Only satellite earth station.

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