An extension to FDDI, called FDDI-2, supports the transmission of voice and video information as well as data. Another variation of FDDI, called FDDI Full Duplex Technology (FFDT) uses the same network infrastructure but can potentially support data rates up to 200 Mbps.

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FDDI Tutorials and Resources
Good collection of links to FDDI documents, including papers, tutorials, and articles. This page is hosted by the InterOperability Lab at the University of New Hampshire.

Fiber Distributed Data Interface
This paper from Cisco provides background information about FDDI technology, explains how FDDI works, describes the differences between FDDI and CDDI and describes how CDDI works.