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Introduction


ISO/IEC 9646 (ITU X.290 series) is a five-part standard which defines a framework and methodology for conformance testing of implementations of OSI and ITU protocols. The test notation, the Tree and Tabular Combined Notation (TTCN), is the third part of this standard, i.e. ISO/IEC 9646-3.

The use of TTCN is increasing, and as the notation has now become an ISO International Standard and a ITU Recommendation, we believe there exists a need for a guideline on TTCN.

We do not describe the TTCN in the same order that it is presented in the standard, but instead have used a bottom-up approach. We begin by introducing some basic TTCN features developed round a simple example. Additional features are introduced as required. We have tried to concentrate on aspects that have been introduced in the IS version of the notation, especially concerning the use of ASN.1. We also address the concurrent TTCN.

We hope that readers will find this approach instructive. The guidelines intends to provide:


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