A functional network model for analytical file management in ISDN systems from generalization of videotex systems

Abstract

A network is proposed as a foundation for the functional and analytical studies of ISDN systems. Based on the characteristics of the problem to be solved, the model may be used to produce a functional classification of ISDN systems so as to facilitate the research for analytical methods of solution. The model consists of two parts. Part I is a functional architecture for interconnecting the four component systems of an ISDN system, namely the systems of users, information providers, gateway service providers and information servers. Part II describes a general scheme for obtaining functional classifications of ISDN systems. Each classification depends on the functional decomposition of some of the component systems and on the processing strategies of the problem. As illustrative examples, videotex systems (which are special cases of ISDN systems) are used throughout the paper. The major videotex systems are first classified into six types. Analytical methods for solving the problems of allocation of files and assignments of users and information providers to the information servers are then discussed.