Stability, CBEMA, 22/25 numbers, 9/3 4-wire circuits, 30/7, 30/10 COS, 22/26 Super refractive effects, microwaves, 50/4 software, 25/16 ECSA, 22/25 Super-trunk, cable TV, 57/18 Index/22 Superframe, TDM, 21/6-7 TCT/- (Telecommunication Standards see also Telephone switching systems Supergroups, FDM transmission, 20/5-6 Policy Committees), 22/21-2 Telephone instrument, 31/4-6, 58/3-13 Suppressed carrier modulation, 18/4-6 TDA (Tunnel Diode Amplifiers), 51/11 dc characteristics, 58/7-8 Surface error efficiency, antenna, 17/9 TDB (Telecommunications Development digital, 58/11 Surface waves, 6/7 Bureau), 22/5 earphones, 58/12 cluttered environments, 6/24 TDM (Time Division Multiplexing), handset design, 58/5-6 field strength prediction, 6/24-5 21/1-16, 40/3-8 headsets, 58/11-12, 58/13-14 ground conductivity, 6/25 alarms and error conditions, 21/10-12 impedance, 58/7 and ground waves, 6/22 asynchronous, 40/4-5 loudspeaking, 58/10 realistic terrain solutions, 6/23-4 efficiency and errors, 40/4-5 microphones, 58/12 reference field strength, 6/22 coding schemes, 21/12-14 receive sensitivity, 58/7 Sommerfield-Norton theory, 6/22-3 digital structure, 21/4-5 receivers, see also Electromagnetic waves; examples, 21/14-16 moving coil, 58/5 Radiowave propagation fast packet switching, 55/3, 55/7 rocking armature, 58/5 Surge suppressors, safety, 23/7-8 framing and coding formats, 21/6-10 sending sensitivity, 58/6 SVCs (Switched Virtual Circuits), integrated telephone networks, 29/10, signalling, packet switching, 40/12-13, 54/3-5 31/14 dual tone multifrequency, 58/9-10 Sweden, paging frequencies, 45/4 multipoint systems, 52/4, 52/7-8 loop disconnect, 58/9 SWFs (Short-wave fadeouts), 9/4 in PCM, 19/12 ringing, 58/8-10 Switched mode power systems, 24/10 statistical, 40/6-8 transmitters, Switching, ATM, 41/5-8 synchronous, 21/4, 40/5-6 carbon granule, 58/3 Switching systems see Telephone see also Multiplexers/multiplexing; piezo-electric, 58/4 switching systems rocking armature, 58/3-4 Symbolic execution software testing, TDMA (Time