ressing, 29/15, 44/5-6 Kolmogorov's ideas on algorithmic FDM, 20/12 services, 44/3-5 complexity, 4/4 Intermodulation products, FDM overload, signalling, 43/8-11, 44/12 KSB (Knowledge Based Systems), 20/16 system 12, 32/8 software, 25/7 International gateways, AXE system, test equipment, 61/16-21 32/17 transmission planning, 30/4 Lambert's law, International numbering, 29/14-15 UK developments, 44/10-13 absorption, 7/12 International Table of Frequency videoconferencing, 57/32-3 radiation, 7/5 Allocations, 22/7 voice processing with, 37/7 Land path antenna loss, 6/16 see also Frequency, assignment, see also B-ISDN LANs (Local Area Networks), 13/3, allocation and management ISI (InterSymbol Interference), 19/3, 32/24, 56/3-17 International telephone networks, 29/7-8 19/4, 61/4 with All Area Networking, 56/16-17 Internet, 16/20 ISM (ISDN Subscriber Module), AXE applications, 32/17, 32/18 INTERSPUTNIK satellites, 51/3 System 12, 32/10 bridges, 56/11-13, 56/15 Intrusion on calls, PABXs, 34/12 ISO (International Standards broadband and baseband coax, 56/8 INTUG (International Organisation), 16/7, 22/5, 22/13-14 bus, ring and star, 56/9 Telecommunications User Group), ISPs (International Standardised Centrex, 35/5 22/14-15, 22/26 Profiles), OSI, 16/8, 22/14, 22/23 characteristics and standards, 56/7-11 Inventory management, 16/6 ISRM (Initial Service Request Message), fast packet switching, 55/3, 55/6, 55/10 Inverse square law, sound, 8/3 34/10 gateways, 56/14-15 Inverse z-transforms, 2/15-16 ITALSAT satellite, 9/16 internetworking, 56/11-15 Investment return, 16/5 Italy, paging frequencies, 45/4 OSI reference model, 56/9-11 IO (International Organisations), 22/6 ITSTC (Information Technology packet switching, 54/4-5 IOC (Input Output Controller), DMS, Steering Committee), 22/20 with PCs, 56/6-9 32/24 ITU (International Telecommunications repeaters, 56/11 Ion satellite engines, 51/8 Union), 22/5-8, 26/3, 26/5, 26/6, 26/12, routers, 56/13-14 Ionosonde, 26/14-15 TCP/IP, 16/20 CW chirp sounders, 9/8-9 IVM (Integrated Voice