See telecommunications service.

An international store-and-forward essentially error-free communications service that is defined by the CCITT (now the ITU-T), has a data signaling rate (DSR) of 2400 b/s over switched telephone networks, and has a communications protocol that supports the CCITT Group 4 facsimile service.

A type of one-way information service in which a subscriber can receive data on a video display.
Note: The information is transmitted to the subscriber's video display over a common carrier channel. A proprietary video adapter unit is required for reception. Contrast with viewdata.

Training that (a) in which usually live instruction is conveyed in real time via telecommunications facilities, (b) that may be accomplished on a point-to-point basis or on a point-to-multipoint basis, and (c) may assume many forms, such as a teleseminar, a teleconference, or an electronic classroom, usually including both audio and video. Synonyms distance learning, distance training, electronic classroom, virtual… (Read More →)

A printing telegraph instrument that has a signal-actuated mechanism for automatically printing received messages.
Note 1: A TTY may have a keyboard similar to that of a typewriter for sending messages.
Note 2: Radio circuits carrying TTY traffic are called "RTTY circuits" or "RATT circuits. "

A device that controls and coordinates operations between teletypewriters and message switching centers.

A switched teletypewriter service in which suitably arranged teletypewriter stations are provided with lines to a central office for access to other such stations.

The shifting of signal pulse transitions from their proper positions relative to the beginning of the start pulse.
Note: The magnitude of the distortion is expressed in percent of a perfect unit pulse length. Synonym start-stop TTY distortion.

A form of telecommunication for the transmission of transient images of fixed or moving objects. [NTIA] [RR] [47CFR]
Note 1: The picture signal is usually accompanied by the sound signal.
Note 2: In North America, TV signals are generated, transmitted, received, and displayed in accordance with the NTSC/ATSC standard.

See translator.