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TTCN is a standardized, general-purpose testing and test control notation which is designed to provide a unified test description language for both development and execution. It is used to test conformance and interoperability of communication protocols and their implementations. TTCN is based on the Estelle language and the ASN.1 language. TTCN has been standardized by the European Telecommunications Standards Institute (ETSI), and the latest standard is TTCN-3. TTCN-3 is a major revision of the language which adds support for testing object-oriented and distributed systems. TTCN is a powerful testing language which allows for the creation of complex test cases. It is also highly portable, and can be used on a variety of platforms.