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

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Chapter 17. X.25

Objectives

  • Discuss the history and development of the X.25 protocol.

  • Describe the basic functions and components of X.25.

  • Describe the frame formats of X.25.

Introduction

X.25 is an International Telecommunication Union–Telecommunication Standardization Sector (ITU-T) protocol standard for WAN communications that defines how connections between user devices and network devices are established and maintained. X.25 is designed to operate effectively regardless of the type of systems connected to the network. It is typically used in the packet-switched networks (PSNs) of common carriers, such as the telephone companies. Subscribers are charged based on their use of the network. The development of the X.25 standard was initiated by the ...

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