Telecommunication 559 Telecommunication systems 257 Computer networks 111 Artificial satellites in telecommunication 77 Information technology 63 Social aspects 58 Signal theory (Telecommunication) 56 Management 53 Telecommunication policy 44 Internet 43 Mobile communication systems 43 Wireless communication systems 42 Technological innovations 38 Signal processing 37 Digital communications 33 Internetworking (Telecommunication) 33 History 32 Data transmission systems 29 Broadband communication systems 28 Mass media 28 Security measures 27 Electronics 24 Equipment and supplies 24 Law and legislation 24 Economic aspects 21 Convergence (Telecommunication) 20 Telecommunication in medicine 20 Information society 19 Communication systems 18 Data processing 18