Table of ContentsIntroduction.
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.
Packet Assemblers/Disassemblers (PADs).
Packet Switching Nodes.
Network Management Center.
2. Packet Switching Network Operation.
Routing in Packet Switching Networks.
Resource Management in Packet Switching Networks.
Acknowledgment and Error Control.
Delay in Packet Switching Networks.
3. Packet Switching Protocols.
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.
Typical “Good Fit” Applications.
When to Use Public and Private PSDNs.
Four Typical Scenarios.
5. Packet Switching Benefits.
Migration to Packet Switching: A Comparative Benefits Analysis.
The Benefits of Packet Switching: A Summary.
6. Packet Switching in a Private Wide Area 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.
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.