With the advent of ISDN and the disappearance of the traditional telephone network, communication networks face a period of transition. Digitization of networks is radically altering present concepts: numerous new services will soon be introduced into the field and this book describes in detail the developments already taking place. It covers the basic principles of the new technology and aims to give as complete a picture as possible over two volumes.

This work describes the principles of digital communications. Based upon the authors' own research, the book provides a comprehensive and quantitative investigation of the effects of linear and nonlinear distortions and interferences. Focusing on digital modulated signals transmitted on radio or satellite link, the text examines how equipment is selected with reference to the channels which will be used. Along with conventional and more current solutions to digital communication problems, the numerous graphs, diagrams and formulas prove useful in designing transmission systems.

With the increasing congestion of roads, there is now a need for traffic information which is current, accurate and specific to the needs of the individual driver. By applying the developments in information technology to the problem of road management, road transport informatics (RTI) can provide such data. This volume details the latest R&D in those IT systems which can be used to aid traffic mobility and safety. Focusing upon the topical area of mobile communications, the authors cover the key concepts and issues of RTI, including the recent technical developments in search techniques, radio messaging and radio data systems.

In the construction of open computer networks, security is a key consideration. The goal of this book is to promote an integrated approach to security. It describes the design and implementation of security systems within an open distributed framework, with particular emphasis on the features, protocols, services and mechanisms which characterize a global integrated security system. Introducing the basic concepts of distributed systems and network security, the authors stress the practical benefits of a comprehensive integrated security system. The book also contains an overview and analysis of the ISO/OSI standard for security architecture.