 system 12, 32/7 5/3-5, 5/7, 5/13 11/3, 11/9, 32/18 videoconferencing, 57/33 Bit interleaving, TDM, 21/4 advantages, 41/8 B-MAC television, 57/8 Bit synchronisation, digital transmission, B-ISDN, 41/5, 41/8-18, 44/14, 44/15-16 B-UNI (Broadband User/Network 28/12-13 Cell Relay fast packet switching, 55/8-9 Interface), 41/8 Bit-Error Ratio see BER LANs, 56/17 BABT (British Approvals Board for Bits definition, 10/3 multiplexing, 41/4-5 Telecommunications), 22/19 Black-box software testing, 25/15 principles, 41/3-8 Baby Bells, 11/6-7 Blackman data windows, 2/17 quality of service, 41/18-20 Balanced pair cables, 15/3-5 Blackwell's trapdoor channels, 4/9-10 SDH comparison, 42/26 Baluns, 33/5 Block coding, 14/4-6 switching, 41/5-8 Band III trunked PMR, 46/6-7 Blockage efficiency, antenna, 17/9 Atmospheric wave absorption, 6/18 Bandlimiting signals, 4/12 Blocking probability, teletraffic, 5/6-8, ATOM (Advanced Terminal for Bandwidth, Operation and Maintenance), System 12, digital transmission, 19/3 Boltzmann, 32/12 television, 57/5-6 entropy and disorder, 4/5 Attack time, FDM compressors/ Bar charts, 1/3 gas molecule distribution work, 4/4 expanders, 20/18 Base stations, Boolean algebra, 4/3 Attenuation, measurements, 61/31-2 Boominess, accoustic, 8/11 balanced pair cables, 15/4-5 PMR, 46/4 Booster power converter plant, 24/11 budgets, multipoint radio link, 52/5-6, Baseband LAN transmission, 56/8 Borscht functions, 31/15, 34/11 52/10-11 Baseband modems, 39/9 Bottom-up software testing, 25/14-15 coaxial cables, 15/7-8 Baselines, software, 25/17 Bouger's law, 9/5 distortion, 10/9-10 Batteries, Boundary conditions, electromagnetic optical fibre cables, 53/5-9 portable equipment, 46/3 waves, 2/3, 6/4-6 to space waves by buildings and trees, power systems, 24/12-13 Boyle's law, sound waves, 8/4 satellites, 51/8-9 BPVs (Bipolar Violations) of codes, 61/11 ATUG (Australian Telecommunications Baudot code, 40/4 BRA (Basic Rate Access) ISDN interface, User Group), 22/27 Bauds, 10/3 61/16-17 ATV (Advanced TV), 57/10-12 Bayes' theo