In this article we will discuss FDDI, will make brief discussion on FDDI, last article we discuss about Routing.

Fiber distributed data interface (FDDI), which is an optical data communication standard used for long distance networks provides communication with fiberoptic lines up to 200 kilometers at a speed of 100 megabit per second (Mbps).

Fiber Distributed Data Interface is a standard for data transmission in a local area network. It uses optical fiber as its standard underlying physical medium, although it was also later specified to use copper cable, in which case it may be called CDDI, standardized as TP-PMD, also referred to as TP-DDI.

FDDI is used as backbone to connect copper LANs as shown in the figure. The FDDI cabling consists of two fiber rings, one transmitting clockwise and the other transmitting counterclockwise. A set of ANSI protocols for sending digital data over fiber optic cable. FDDI networks are token-passing networks, and support data rates of up to 100 Mbps (100 million bits) per second. FDDI networks are typically used as backbones for wide-area networks.

Although FDDI logical topology is a ring-based token network, it did not use the IEEE 802.5 token ring protocol as its basis; instead, its protocol was derived from the IEEE 802.4 token bus timed token protocol.

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