FDDI is a

FDDI stands for Fiber Distributed Data Interface. It is a set of ANSI and ISO standards for data transmission on fiber optic lines in a local area network (LAN) that can extend in range up to 200 km (124 miles). The FDDI protocol is based on the token ring protocol. In an FDDI network, data is transmitted over fiber optics in a dual ring of trees structure, which provides redundancy and improves reliability. Each ring can carry data at a speed of 100 Mbps, and the dual ring structure allows for data to be sent in one direction on one ring and in the opposite direction on the other ring, enhancing the fault tolerance of the network.

FDDI was designed to support high-speed networking applications such as digital video and real-time data processing. It was widely used in the late 1980s and 1990s for backbone network systems and as a standard for connecting major computers, especially in complex installations such as universities and large corporations. However, with the advent of faster and more cost-effective technologies such as Gigabit Ethernet, the use of FDDI has significantly declined.