光纤分布式数据接口（FDDI）旨在用于高性能通用系统 多站网络，设计用于高效运行，峰值数据速率为 100 Mbit/s。它使用以光纤为传输介质的令牌环结构。 FDDI提供了数百个在数十公里范围内运行的站点。 FDDI媒体访问控制（MAC）标准ISO/IEC 9314-2规定了较低的子层 FDDI的数据链路层。它指定了对媒体的访问，包括寻址， 数据检查和数据框架。ISO/IEC 9314-2还规定了接收机和发射机 国家机器。ISO/IEC 9314的这一部分是一个抽象测试套件（ATS）的一致性测试 FDDI MAC。由于MAC是一种主要处理完整PDU的协议，因此树和 使用ISO/IEC 9646-3中规定的表格组合符号TTCN语言来指定 MAC协议测试。

The Fibre Distributed Data Interface (FDDI) is intended for use in a high performance general-purpose multi-station network and is designed for efficient operation with a peak data rate of 100 Mbit/s. It uses a Token Ring Architecture with optical fibre as the transmission medium. FDDI provides for hundreds of stations operating over an extent of tens of kilometers. The FDDI Media Access Control (MAC) standard, ISO/IEC 9314-2, specifies the lower sub-layer of the Data Link Layer for FDDI. It specifies access to the medium, including addressing, data checking and data framing. ISO/IEC 9314-2 also specifies the receiver and transmitter state machines. This part of ISO/IEC 9314 is an abstract test suite (ATS) conformance test for FDDI MAC. Since MAC is a protocol that deals primarily with complete PDUs, the Tree and Tabular Combined Notation TTCN language specified in ISO/IEC 9646-3 is used to specify MAC protocol tests.