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

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Chapter 14. Switched Multimegabit Data Service

Objectives

  • Tell how SMDS works, and describe its components.

  • Describe the operational elements of the SMDS environment, and outline its underlying protocol.

  • Discuss related technologies.

  • Discuss SMDS access classes and cell formats.

Introduction

Switched Multimegabit Data Service (SMDS) is a high-speed, packet-switched, datagram-based WAN networking technology used for communication over public data networks (PDNs). SMDS can use fiber- or copper-based media; it supports speeds of 1.544 Mbps over Digital Signal level 1 (DS-1) transmission facilities, or 44.736 Mbps over Digital Signal level 3 (DS-3) transmission facilities. In addition, SMDS data units are large enough to encapsulate entire IEEE 802.3, ...

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