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The Testing and Test Control Notation version 3 (TTCN-3) is a programming language designed for testing telecommunications systems. It is an international standard maintained by the European Telecommunications Standards Institute (ETSI). TTCN-3's syntax supports modular design allowing engineers to reuse test components across different types of tests. The language's features include parameterization, behavior-based testing, and powerful type system with built-in support for abstract data types that helps in creating complex test scenarios. TTCN-3 can be used in combination with other languages such as ASN.1 or SDL to define message formats and signaling protocols, making it suitable for verifying entire network systems rather than individual components only.

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