LAN Technologies Explained
From the familiar to the esoteric, this book delivers on its promise of covering just about anything you ll ever want to know about networks.
TABLE OF CONTENTS LAN Technologies Explained
Section C: Token Ring/IEEE 802.5 (ISO 8802-5)
Chapter List
- Chapter 16: Token Ring Introduction
- Chapter 17: The Physical Layer
- Chapter 18: The Media Access Control (MAC) Layer
- Chapter 19: Ring Management
- Chapter 20: Source Route Bridging
- Chapter 21: Dedicated Token Ring
- Chapter 22: High Speed Token Ring
This section aims to explain the fundamentals of the token passing protocol and look at how Token Ring has developed from a passive technology into one based very much on active equipment. It includes detailed explanations on station operation, protocol theory and ring management. Having established the method of operation we will then explore the physical composition of Token Ring LANs from a simple passive network through to today's more complex switched networks.
16.1 A Brief History of Token Ring
The Token Ring access protocol dates back prior to 1970, in fact it was first proposed to the IEEE for standardization as early as 1969. It was developed by IBM as a high speed method (relative to other technologies at that time) of interconnecting mainframe computers. This proposal to the IEEE was at the time not acted upon, but was revisited in 1980 upon the development of the personal computer. Much of the initial development undertaken by IBM was used as the foundation for the IEEE 802.5 sub-committee to initiate research into a LAN access method based upon Token Passing. The potential for Token Ring to become a suitable access protocol for forthcoming LANs based on low cost desktop machines had been realized and work commenced towards producing some level...
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