e are the the transmission of voice, data and video.) functions provided in connection with a subscriber Australian Telecommunications Users' Group. line circuit. The functions are usually implemented Advanced Television. by an integrated circuit.) Administrative Unit. (Term used in synchronous Broadband over Passive Optical Networks. transmission. Ref: CCITT C.709. It is the level at Binary Phase Shift Keying. which circuit administration is carried out by the Bipolar Violation. (Impairment of digital trans- operator.) mission system, using bipolar coding, where two AUSSAT Australian national Satellite system operating com- pulses occur consecutively with the same polarity.) pany. Basic Rate Access. (ISDN, 2B+D code.) AUSTEL Australian Telecommunications authority. Broadcast Recognition with Alternating Priorities. Analogue Variable Delta Modulation. (Multiple access technique.) American Wire Gauge. BRITE Basic Research in Industrial Technology for Europe. (EC programme.) British Rail Telecommunications. (Telecommunica- B-ISDN Broadband Integrated Services Digital Network. tions arm of British Rail, in the UK.) British Approvals Board for Telecommunications. Bipolar Return to Zero. (A channel coding tech- BASIC Beginners All Symbolic Instruction Code. (Com- nique, used for digital transmission.) puter programming language.) Base Station Controller. (Controllers for Base Trans- Block Check Character. (A control character which ceiver Stations, or BTS, within mobile radio sys- is added to a block of transmitted data, used in items.) checking for errors.) Branch System General Licence. (Telecommunica- Binary Coded Decimal. (An older character code tions licence in the UK.) set, in which numbers are represented by a four bit British Standards Institute. sequence.) Broadcast Satellite Service. Bose Chaudhure Hocquengherm. (Coding tech- Base Transceiver Station. (Used in mobile radio nique.) based systems to provide the air interface to the Bureau for Development of Telecommunications customer.) Building Distribution 