Fiber Distributed Data Interface

Fiber Distributed Data Interface (FDDI) was developed for the transmission of data over fiber at 100 Mbps. The standard is governed by the American National Standards Institute (ANSI). FDDI is deployed in a dual-ring topology. Each dual-attached station (DAS) attaches to both rings; the second ring is on standby. If there is a failure of a station or a link on the ring, a ring wrap occurs, creating a single ring for continued communication. Access to the ring is by the use of a token (as in Token Ring). Figure D-14 shows a sample FDDI network.

Figure D-14 Sample FDDINetwork

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