The Basics Book of X.25 Packet Switching

The Basics Book of X.25 Packet Switching

by Motorola Codex Staff



Product Details

ISBN-13: 9780201563733
Publisher: Addison Wesley Professional
Publication date: 12/05/1991
Series: The Motorola Codex Basics Book Ser.
Pages: 96
Product dimensions: 5.39(w) x 8.27(h) x (d)

Table of Contents

The Plan of This Book.
Why all the Interest in Packet Networks?
What is Packet Switching?
What Is a Virtual Circuit?
The Interactive Nature of Packet Networks?
Public, Private, and Hybrid Packet Networks.

1. Packet Switching Network Components.
Local Access Components.
Packet Assemblers/Disassemblers (PADs).
Packet Switching Nodes.
Network Links.
Network Management Center.

2. Packet Switching Network Operation.
The Three Phases of a Virtual Connection.
Routing in Packet Switching Networks.
Resource Management in Packet Switching Networks.
Acknowledgment and Error Control.
Delay in Packet Switching Networks.

3. Packet Switching Protocols.
What Is a Protocol?
The Importance of Standardization: The Role of the CCITT.
What is X.25? .
The X.25 Physical Layer Standard.
The X.25 Link Layer Standard.
The X.25 Network Layer Standard.
Additional CCITT X. Recommendations Applicable to Packet Switching.
A Few Words about Protocol Conversion.

4. Packet Switching Applications.
The Rules of the Road (Three General Criteria).
Typical “Good Fit” Applications.
When to Use Public and Private PSDNs.
Four Typical Scenarios.

5. Packet Switching Benefits.
Data Communications FacilityPerformance: Eight Measurement Criteria.
Migration to Packet Switching: A Comparative Benefits Analysis.
The Benefits of Packet Switching: A Summary.

6. Packet Switching in a Private Wide Area Network.
Why Build a Private X.25 Network?
Packet Switching in Multipoint.
Polling Environments: Three Major Drawbacks.
Support of Multipoint Polling Protocols on a PSDN The Benefits of Packet Switching in a Polled Multipoint Environment.
Statistical Multiplexing vs. Packet Switching: How to Choose.
Why a Cable TV Firm Chose Statistical Multiplexing.
Why a Major Manufacturer Chose X.25 Packet Switching.
Statistical Multiplexing vs. Packet Switching: A Summary.

7. A Few Notes on the Future of Packet Switching.
Sample X.25 Packet Formats.


This is one in a series of booklets designed to explain in everyday language some of the basics of data communications networks. At Motorola Codex, we aren't limited to any one networking approach, and we don't believe you should be either. Together these bookets are intended to help you understand more fully the variety of approaches available. (if you feel the need to brush up on basic basics, ask for a copy of our Basics Book of Information Networking.)

We hope you find the Basics Book of X.25 Packet Switching a useful tool as you continue to explore cost-effective ways to make your network more productive. Should the book prompt further questions about the benefits or implementation of an X.25 network, we'll be happy to help you find the answers.

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