This paper describes a support system which designs a complete and error-free service specification from ambiguous user requirements in a communication system. Each of the user requirements, defined as a combination of terminal operation and a reaction of a switching system to it, is converted into an individual service graph (ISG); and all ISGs are integrated into a total service graph (TSG) which is the final service specification. TSG is verified by three methods: a semantical one, a logical one, and a prototyping one. Then TSG is converted into SDL representation so that it can be used to design communication softwam.
This paper describes a method of converting a specification and description language (SDL) specification into a program by introducing SDL/OS. The TRONspecification 0s is adopted as 0s and C++ as a programming language to make the program portable. SDL/ OS, which consists of libraries described in C++, is constructed on 0s so that the program converted from SDL can run as it is. SDL/OS realizes the SDL functions easily by using the functions of TRON-specification 0s.Finally, this paper reports that this method is very effective in enhancement of software productivity by applying it to software development of real communication systems. Moreover, performance degradation can be compensated to some extent by introducing function calls in the same task.
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