of the transponder's power and band- the reception of television via satellite.) width for a short period, and transmit in bursts of Travelling Wave Tube. data.) Travelling Wave Tube Amplifier. Tracking and Data Relay Satellite. Teletypewriter exchange service. (Used in Canada.) Terminal Equipment. TeraFLOP (Trillion Floating Point Operations per second. TEDIS Trade Electronic Data Interchange System. (Euro- (Measure of a super computer.) pean Commission programme.) Terminal Endpoint Identifier. (Used within ISDN Layer 2 frame.) User Application Process. TELMEX Telefonos de Mexico. (Mexican PTT.) Universal Asynchronous Receiver/Transmitter. Talker Echo Loudness Rating. (Overall loudness (The device, usually an integrated cirucit, for trans- rating of the talker echo path.) mission of asynchronous data. See also USRT and Transverse Electromagnetic cell. (Code used for USART.) measuring characteristics of receivers such as Unshielded twisted pair Development Forum. (As- pagers.) sociation of suppliers promoting transmission over Telecommunication Equipment Manufacturers As- UTP.) sociation. (UK.) User Datagram Protocol. TETRA Trans European Trunked Radio. (ETSI standard for Ultra High Frequency. (Radio frequency, extending PMR.) from about 300MHz to 3GHz.) Terrestrial Flight Telephone Service. User Interface. Telecommunication Industry Association. (US Underwriters Laboratories. (Independent USA or- based. Formed from merger of telecommunication ganisation involved in standards and certification.) sector of the EIA and the USTSA.) Universal Mobile Telecommunications System. Trade Mark. (ETSI terminology for a future public land mobile Telecommunication Managers' Association. (UK) telecommunications system.) Telecommunications Management Network. United Nations. Trunked Mobile Radio. UNCTAD United Nations Conference on Trade And Develop- Telecommunication Network Voltage circuit. (Test ment. circuit for definition of safety in telecommunication User Network Interface. (Also called User Node systems.) Interface. Exte