Fiber Distributed Data Interface

Fiber Distributed Data Interface

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Fiber Distributed Data Interface (FDDI) is a standard for data transmission in a local area network (LAN) that can extend in range up to 200 kilometers (124 miles). The standard was developed in the mid-1980s by ANSI (American National Standards Institute) and provides data rates of 100 Mbps (megabits per second).

FDDI uses optical fiber as its standard underlying physical medium but was later adapted for copper cable, in which case it may be called CDDI (Copper Distributed Data Interface).

FDDI’s primary advantage is that it can support high speeds over larger distances than other typical LAN protocols like Ethernet. It also offers a high degree of fault tolerance, meaning that if one part of the network fails or a connection is lost, it will automatically re-route data to keep the network functioning.

FDDI is often used as a backbone for wide-area networks (WANs) where long-distance data transmission is necessary. However, with the widespread adoption of Ethernet at Gigabit speeds and beyond, FDDI has largely been phased out in favor of newer, faster standards. As of my last update in September 2021, it’s not commonly used for new installations.

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