Public data networks: from separate PDNs to the ISDN
Public Data Networks provide a comprehensive survey of PDNs, covering all major countries. PDNs allow efficient and cost-effective telecommunication between a terminal and computer, or between computers, regardless of who owns the data terminal. The authors discuss the current state of, and forthcoming developments in, data communications using public telecommunication facilities. Apart from the classical telecommunication networks (telegraph and telephone), public data networks provide the majority of data communication services worldwide. The range of data services and user facilities has gradually expanded, the quality of services improved, and new services have appeared (e.g. datafax, teletex, videotex, message handling and teleconferencing). The authors concentrate on PDN principles, taking account of the latest CCITT recommendations and ISO standards. Appendices and references provide detailed information for those working on PDNs at research, design an implementation level. Network digitalization and integration of networks and services have aided progress towards the integrated services digital network (ISDN). The ISDN uses advanced transmission and switching techniques to enhance the telecommunication services provided to its users. An ISDN has much in common with the PDN as far as architecture, methods of network management and functions are concerned, but there are distinct differences in the methods of access and signalling. The authors have extensive experience in data communication networking. Dr. Kubin is vice-chairman of Study Group IX of the International Telegraph and Telephone Consultative Committee (CCITT); Dr. Puzman is the Czechoslovak representative at Technical Commission 6 (TC-6) of the International Federation for Information Processing (IFIP). Public Data Networks is essential reading for researchers and designers of PDNs, in universities and industry, and provides important reference material for telecommunications and computer science students.
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Public Data Network Principles
Switching in Networks
9 other sections not shown
applications basic bit/s call set-up called DTE CCITT CCITT recommendation character circuit switched closed user group connection connection-mode connectionless-mode connector CSPDN D-channel data circuit data communication data link data messages data signalling rate data transfer data transmission data transmission services delay demultiplexer DTE-DCE interface encipherment error control example exchange flow control frame functions HDLC identification interchange circuits interworking ISDN kbit/s LAPB link layer logical channel methods mode modem multiplex network layer network performance network service numbering plan octets open systems interconnection operation OSI reference model parameters physical layer principles procedure protocol data units protocol specification PSPDN PSTN public data network routing sequence service definition services provided standards station structure switching node synchronous Table telecommunication networks telecommunication services telegraph teletex Telex terminal equipment throughput transmitted user classes user data user facilities user information values virtual circuit