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Fiber distributed data interface (FDDI), which is an optical data communication standard used for long distance networks provides communication with fiber optic lines up to 200 kilometers at a speed of 100 megabit per second (Mbps). FDDI has dual primary and secondary communication rings. The primary ring works alongside the network, and the secondary ring remains idle and available for backup.
FDDI was later extended to FDDI-2 for long distance voice and multimedia communication. Organizations use this medium for voice and video conferences, online lectures, news and other multimedia.
FDDI networks, which are designed for geographically large-scaled organizations that support thousands of end users, operates in the OSI model's physical and media access control (MAC layers).
The American National Standards Committee (ANSC) formally standardized FDDI as the best linking medium for local area networks (LAN), which use FDDI for long-distance communication.
FDDI also is used by single and multi-mode fiber optic, which have different communication mechanisms. Multi-mode fiber optic uses a lead generation device, whereas single-mode fiber optic uses laser for data transmission only.