Integrated services digital networks 36 Standards 6 Broadband communication systems 4 Computer networks 4 Congresses 4 Digital communications 4 Testing 4 Local area networks (Computer networks) 3 Telecommunication 3 Asynchronous transfer mode 2 Data transmission systems 2 Telecommunication systems 2 Computer-aided design 1 Design and construction 1 Discrete-time systems 1 Electronic networks 1 Equipment and supplies 1 Extranets (Computer networks) 1 Integrated circuits 1 Interface circuits 1 Management 1 Mathematical models 1 Queuing theory 1 Security measures 1 Traffic 1 Very large scale integration 1 Wide area networks (Computer networks) 1