Formal specification and validation of ISO transport protocol components, using petri nets

In this paper, we provide the Petri net formal specifications of three important components of the ISO transport protocol: timeout mechanism, data transfer phase and connection establishment and release phases. A validation of these component Petri net specifications is then presented, followed by a discussion of its results. The validations we conducted made use of a software tool based on OGIVE [1], which can check a given Petri net for general properties such as boundedness, properness and liveness, and designer defined structural properties using Petri net invariants. We have extended OGIVE to allow for the checking of reception errors and state ambiguities as well.