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CHAPTER Practical Token Ring Implementation

CHAPTER Practical Token Ring Implementation. 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

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CHAPTER Practical Token Ring Implementation

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  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 802.5 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 802.5 • 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 Special IBM Connectors Muti-Station Access Unit IBM Type 1 Twisted Pair 9-Pin AUI Connectors Client Client Server

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

  12. An Actual 16 Mbps Token Ring Implementation • 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 Physical Implementation Logical Functioning

  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 802.5 • Speed • 4M, 16M and 100M bps • Transmission • Baseband

  20. Token Passing Access Method Token Acknowledgment Origin Destination Data Delivery

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

  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 Out Ring In Ring In

  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 <500’ UTP <148’ Type 1 <330’ STP <328’

  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 Backbone MSAU Client Hub MSAU Client Server Wiring Rack (Wiring Closet) 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 Media Filter Desktop Patch Panel RJ 11/ RJ45 Telephone Punch-down Block

  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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