Abstract
This chapter describes fiber distributed data interface (FDDI), which is one of the earliest fiber-based LAN technologies. It is based on a dual-ring topology composed of two counter-rotating rings that operate at a data rate of 100 Mb/s. It uses dual counter rotating rings to enhance reliability. The primary ring is of utmost importance. The secondary ring is used in case of failures. Multiple failures result in multiple rings. Multimode fiber connects each station together and the total ring can be 100 km in length. A maximum of 500 stations can be connected in the ring, forming an ideal backbone network. FDDI consists of a set of stations serially connected by a transmission medium to form a closed loop. There are two types of FDDI stations: a dual-attach station, which is connected to both rings, and a single-attached station, which is attached only to the primary ring.
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