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Internetworking Technologies Handbook, Fourth Edition by Cisco Systems, Inc.

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Chapter 9. Fiber Distributed Data Interface

Objectives

  • Provide background information about FDDI technology.

  • Explain how FDDI works.

  • Describe the differences between FDDI and Copper Distributed Data Interface (CDDI).

  • Describe how CDDI works.

Introduction

The Fiber Distributed Data Interface (FDDI) specifies a 100-Mbps token-passing, dual-ring LAN using fiber-optic cable. FDDI is frequently used as high-speed backbone technology because of its support for high bandwidth and greater distances than copper. It should be noted that relatively recently, a related copper specification, called Copper Distributed Data Interface (CDDI), has emerged to provide 100-Mbps service over copper. CDDI is the implementation of FDDI protocols over twisted-pair copper wire. ...

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