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CHAPTER Practical Token Ring Implementation. Chapter Objectives Give an overview of the Token Ring LAN Describe the characteristics of the Token Ring.

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Presentation on theme: "CHAPTER Practical Token Ring Implementation. Chapter Objectives Give an overview of the Token Ring LAN Describe the characteristics of the Token Ring."— Presentation transcript:

1 CHAPTER Practical Token Ring Implementation

2 Chapter Objectives Give an overview of the Token Ring LAN Describe the characteristics of the Token Ring LAN Discuss the implementation of Token Ring LANs with illustrations of the LAN components and connections Provide notes on the actual implementation of the LAN in buildings

3 Chapter Modules An Overview of Token Ring LANs Token Ring Basic Characteristics Implementation of Token Ring More notes on implementation

4 MODULE An Overview of Token Ring LANs

5 Module Objectives Define Token Ring networks Trace the origin of Token Ring Discuss the current status and usage Provide an illustration of a typical Token Ring configuration Present actual Token Ring implementations

6 Token Ring Defined Token Ring is a standardized and efficient network Based on the token passing protocol Conforms to the IEEE standard

7 Token Ring Origin Introduced by IBM in 1984 for connecting the following: –Personal computers –Mid-range computers –Mainframe computers Current position with IBM –Part of the SNA specification for interconnection related to IBM products

8 Current Status of Token Ring Technology Standardized –IEEE Becoming overshadowed by Ethernet for LAN applications due the following reasons –Higher speeds of Ethernet –Lower cost of Ethernet Ethernet cabling borrows from the telecommunication industry, hence it is cheaper

9 Current Usage In the 4-16 Mbps range, the token ring remains an efficient LAN technology 100 Mbps Token Ring networks are now used in the field Token ring technology is used for the backbone in large networks where the operating speed is in the range of 100 Mbps –An example is FDDI

10 A Typical Token Ring LAN Configuration Muti-Station Access Unit Client Server IBM Type 1 Twisted Pair 9-Pin AUI Connectors Special IBM Connectors

11 An Actual 4 Mbps Token Ring Implementation u Source: Blackbox Corporation

12 An Actual 16 Mbps Token Ring Implementation u Source: Blackbox Corporation

13 END OF MODULE

14 MODULE Token Ring Basic Characteristics

15 Module Objectives Logical an physical topologies and implementation Cabling Access method, speed and transmission Frame format

16 Topology Logical –Ring Physical –Star

17 Logical and Physical Implementation Logical Functioning Physical Implementation

18 Cabling Shielded or unshielded Twisted Pair IBM –Types 1, 2, 3 etc. Others

19 Access Method, Speed and Transmission Access method –Token passing IEEE standard –IEEE Speed –4M, 16M and 100M bps Transmission –Baseband

20 Token Passing Access Method Token Origin Destination Data Delivery Acknowledgment

21 Frame Format Data Start Access Control Frame Control Destination Address Source Address Frame Check Sequence End Delimiter Frame Status

22 END OF MODULE

23 MODULE Implementation of Token Ring

24 Module Objectives Token Ring hardware requirements Actual implementation hardware Implementation rules

25 Token Ring Implementation Hardware Token ring NIC Cable –IBM Type 1 or 2 or 3/ or UTP as needed by the design Multistation Access Unit (MAU) –Multistation Access Unit (MSAU) –Smart Multistation Access Unit (SMAU) –Incorporates bypass mechanism for fault tolerance

26 Actual Implementation Hardware

27 Token Ring Implementation Rules: For IBM Rings and Hubs Maximum number of hubs on a ring –33 Maximum number of computers on MSAU-based networks –72 with unshielded cable –260 with shielded cable

28 Multi-Hub Rings Ring Out Ring In Ring In Ring Out

29 Token Ring Implementation Rules: Cable Length Maximum station distance from MSAU –330 feet for Type 1 –328 feet for STP –148 feet for UTP Minimum length from MSAU –8 feet Maximum distance between MSAUs –500 feet

30 Distance Limitation Illustrated Type 1 <330’ STP <328’ UTP <148’ <500’

31 END OF MODULE

32 MODULE More Notes on Implementation

33 Module Objectives Implementation in a building Use of telephone wiring for implementation Notes on connectors and media filters Use of fiber optics to extend the length of the connection between a MSAU and a node

34 Implementation in a Building Hub MSAU Client Server Wiring Rack (Wiring Closet) MSAU Backbone IBM Type 1

35 Notes on Installation in a Building Wiring closet is a reserved space in the building for housing wiring hubs Wiring rack MSAUs

36 The Use of Installed Telephone Wiring for Token Ring MSAU Telephone Punch-down Block Patch Panel Desktop Media Filter RJ 11/ RJ45

37 Notes on Connectors Regular connector –AUI –MIC Telephone line connectors –RJ-45 (8-pin) –RJ-11 (4-pin) –Require media filter interface for connection to the Token Ring NIC

38 Media Filter

39 Notes on Cable Extension Patch cables –Used for extending the length of a cable –Uses IBM MIC connectors Repeaters –To extend beyond regular cable length limitation –Distances can be extended using fiber optic extenders as well

40 Fiber-Optic Extender

41 END OF MODULE END OF CHAPTER


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