ee Power supplies slotted, 3/3, 13/7-8, 13/19 yagi, 6/13 ACC (Australian CCITT Committee), Alternators, 24/4 reciprocity, 17/4 22/26-7 AM (Amplitude Modulation), modems, reference, 6/11 Acceptance testing, software, 25/4-5, 39/4-5 satellite, 17/14-16, 51/12-13 25/16 AMA (Automatic Message Accounting), shaped beam satellite, 17/15-16 ACCH (Associated Control Channel), short dipole, 6/8 cellphones, 47/11 Amateur services, frequency allocations, short monopole, 6/9-10 Accommodation, power plant, 24/14-15 26/10-11 simple rod, 6/12-13 Account coding of calls, PABX, 34/12 AMI (Alternate Mark Inversion), 28/10 toroidal radiation pattern, 17/3 Accounting management, 16/5-6 layer 1 ISDN, 44/8 VHF and UHF, 17/16-17 Accunet, AT&T TDM, 21/16 TDM, 21/12 yagi, 6/13, 52/7 ACD (Automatic call distribution), Ampere's law for magnetomotive force, see also Electromagnetic waves; call management, 36/3 radiowave propagation Centrex, 35/3-5, 36/7 Amplification, effect of noise, 10/13 AOWS (Asia and Oceania Workshop for PABXs, 34/13 Amplitude fading, by ionosphere, 9/6 OSI Standardisation), 16/8, 22/14, 22/26 ACK/NAK acknowledgement, 14/3 AMPS (Advanced Mobile Phone APDs (Avalanch Photodetectors), Acoustics see Sound System), cellphone, 47/8 53/16-17, 53/19-21 Acrylate resin coated optical cables, 15/12 Analogue circuits, minimising EMC, Aperiodic signals, 10/6-7 ACS (Accredited Standards Committee) 23/17 Fourier transforms, 2/6, 2/7 US, 22/24 Analogue modulation see Modulation Apertures, minimising EMC, 23/18-20 ACSE (Association Control Service Analogue private network signalling, Apogee satellite motor, 51/5 Element), OSI, 16/9 34/10-11 Appleton layers see Ionosphere ACTE (Approvals Committee for Analogue-to-digital see ADC Appleton-Hartree equations Terminal Equipment), 22/19 Angle modulation, 18/7 (magnetoionic theory), 9/5 Active satellite tracking, 51/16 Angstrom, 7/3 Application layers, OSI, 12/9, 16/9 Ada programming language, 25/13 ANSI (American National Standards APs (Application Processes) OSI, 12/3 Adaptable KBS Systems, 