The fiber distributed data interface (FDDI), which is a standard for optical data communication used in long distance networks, provides connection to fiber optic lines up to 200 kilometers at a speed of 100 megabits per second (Mbps) .

The fiber distributed data interface is standard for transferring data on a local network. The optical fibers are used as the standard primary physical medium, although it is then determined that they use copper cables, in which case they can be called CDDI, standardized as TP-PMD and also called TP-DDI.

FDDI is used as the main pillar to connect copper LAN as shown in the figure. The FDDI cable consists of two fibrous rings, one of them clockwise and the other counterclockwise. A set of ANSI protocols to send digital data through a fiber optic cable. FDDI networks are token pass networks and support data rates of 100 Mbps (100 million bits) per second. FDDI networks are generally used as the basis for broadband networks.

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


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