unction point cost analysis, 25/19 900 standards, 48/3, 48/9 49/10-11 air interface, 47/10-11 exploration and research, 26/13 architecture, 47/9-10 fixed links, 26/7-10 G3/4 facsimile equipment see Facsimile coding, 47/11-12 FM spectra, 18/9 (Fax) security, 47/13-14 FSK spectra, 19/8 G/M/m queue, in equilibrium, 3/10-11, signalling, 47/13 industrial, scientific and medical, 26/6 testing/test equipment, 61/23-8 inter-satellite service, 26/12 G/T (Gain to noise Temperature) ratio, GSO (Geostationary Satellite Orbit), interference problems, 26/5-6 51/12, 51/13 51/4-8, 51/10 Index/10 GSS (Group Switch Subsystem), AXE HSDC (High Speed Data Impedance, system, 32/15 Communication), AXE system, 32/17 balanced pair cables, 15/3-5 Guard bands, TDMA, 13/14 Hub polling, 13/16 coaxial cables, 15/7 Gyrofrequency, 6/20 Hub site, cable TV, 57/18 free space, 6/3 Huffman coding, 57/25 telephones, 58/7 Haas effect, sound, 8/14-15 Huygen's principle, 6/6 Impedance matching, antenna, 6/13, 17/5 Hadamard codes, 14/6 Hybrid coding, video transmission, 57/26 Impulse noise, 10/11, 28/6 Half duplex, Hybrid transformers, telephone, 29/8-9 counter, 10/13 modem operation, 39/5, 39/10 Hydrazine thrusters, satellites, 51/7 Impulse response, PMR systems, 46/3, 46/7 Hydrometeors, depolarisation due to, linear and time-invariant systems, telex, 59/4 6/18-20 2/10-11 Hamming codes, 14/5, 14/6, 14/9 Hyperexponential server, 3/5 matched filters, 19/6-7 Hamming data windows, 2/17 Hypergroups, FDM transmissions, 20/5 Impusive noise in channels, 4/10 Hamming distance, 14/4-5 Hypothesis testing, 1/10 IMSI (International Mobile Subscriber Handover, PCN networks, 48/11 Hypothetical reference systems, FDM, Identity), PCNs/cellphones, 47/13, 48/7 Harmonic distortion, 10/9 20/16 IN (Intelligent Networks), 11/14, 31/16 Harmonic mean, 1/4 In-band signalling, 31/8 Harmonic products, FDM overload, 20/16 I-ETS (Interim European In-octet signalling, 21/5 Harmonics, sound, 8/9 Telecommunication Standards), 22/18 Independant sideband modulation, 18/6 Haselgrove equat