| Fiber Distributed Data Interface
The Fiber Distributed Data Interface (FDDI) standard was developed in the mid-1980s to provide higher-speed data communications than that offered by Ethernet (10 Mbps at the time) or token ring (4 or 16 Mbps at the time).
At a data throughput rate of 100 Mbps, FDDI was an improvement over 10 Mbps Ethernet and 16 Mbps token ring—but it is rarely used since the development of faster Ethernet technologies. FDDI uses fiber-optic cable as the communications medium. A common application of FDDI has been to provide fast access to network servers (again FDDI has been replaced by faster Ethernet technologies for this purpose).
Two types of packets can be sent by FDDI: synchronous and asynchronous. Synchronous communication is used for time-sensitive transmissions requiring continuous transmission, such as voice, video, and multimedia traffic. Asynchronous communication is used for normal data traffic, which does not have to be sent in continuous bursts.
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