Abstract
Formal description techniques (FDTs) are used to cope with problems of misinterpretation and ambiguity in informal specifications of communication protocols and distributed systems. FDTs also offer support for the design, implementation, and testing of complex systems, if they come with a suitable development methodology and a set of powerful tools. In this paper, we report on our experiences in applying FDTs to the X.25 packet level protocol and present basic parts of the specification. For X.25 packet type descriptions, the Abstract Syntax Notation One was used. Behavior of an X.25 DTE was modelled using Communicating Rule Systems (CRSJ, a rule-based specification technique. The motivations for choosing these techniques and the way they have been applied are explained. We conclude by giving an outlook on the intended use of the formal description for deriving and validating X.25 test cases.
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