V (Satellite Mast Antenna TV), Sommerfield-Norton theory, 6/22-3 definition, 10/3 57/18 Sone loudness unit, 8/7 distortion, 10/8-10 SMDR (Station Message Detail SONET (Synchronous Optical Network), radar, 10/6 Recording), 36/3 SDH, 42/17, 53/25-6, 56/16 radio and television, 10/6 SMDS (Switched Multimegabit Data Sound, telephone and telegraph, 10/5-6 Service), 42/26, 55/9 acoustics, 8/10-13 voice and music, 10/5 SMF (System Management Functions), background noise, 8/12 waveform and frequency, 10/3-5 OSI, 11/15 decibels, 8/4-5 Signature curves, DFMs, 50/9 SMI (Structure of Management hearing, 8/5-9 Significance, tests of, 1/10-11 Information), 16/11, 16/20 isolation, 8/12-13 Silicon avalanche photodetectors, 53/16 SMS (Short Message Service), GSM NICAM, 57/12, 57/16, 57/17 Silver hydrogen cells, satellites, 51/8 cellphones, 47/14 one carrier, multichannel systems, SIM (Subscriber Identity Module), Snell's law, refraction and reflection, 6/4, BTSC/MTS, 57/17 cellphones, 47/9, 47/13 53/3, 53/8 FM/FM, 57/16 Simplex cable link, 33/5 SNMP (Simple Network Management psychoacoustics, 8/13-16 Simplex, PMR systems, 46/3 Protocol), 16/19-24 resonances, 8/11 Simulation, software, 25/11-12 monitoring, 61/16 reverberation time, 8/10-11 Single fault safety principle, 23/4-5 SNR see Signal to noise ratio speech and music, 8/8-9 Single frequency signalling, 34/8 Software, two carrier systems, 57/17 Single hill antenna loss, 6/16-17 acceptance testing, 25/4-5 velocity, frequency and wavelength, 8/4 Single mode optical fibres, 53/4 AXE exchange system, 32/13-14 waves, 8/3-4 Single packet operation, 13/18 code and unit test, 25/4 Source coding theorem (Shannon), 4/8-9 Single reserve power systems, 24/9 configeration management, 25/16-17 Source encoding, 4/8-9 Single server queue, 3/3 cost estimating, 25/18-19 Space communication, 6/18 Single talker volume, 20/10 data corruption avoidance, 23/18 Space communications, tropospheric Single token operation, 13/18 delivery and installation, 25/4 effects, 9/15-16 SIO (Scientific and Indust