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Understanding Fast Ethernet: 100Mb/s Networking Technology and Protocol Stack

This chapter delves into Fast Ethernet, a networking technology with a speed of 100Mb/s, elucidating its protocol stack and key components. It covers essential concepts such as the MII interface, 100BaseT4, 100BaseTX, and 100BaseFX, including pair connections and CSMA/CD protocols. With illustrative figures, the chapter explains the configuration of repeaters and hubs, typical distances in network segments, and the integration of Ethernet switches to expand network diameter. This comprehensive guide serves as a valuable resource for networking professionals and students alike.

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Understanding Fast Ethernet: 100Mb/s Networking Technology and Protocol Stack

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  1. Network CommunicationsChapter 10 Fast Ethernet (100Mb/s) Networking Technology

  2. MII Fast Ethernet Protocol Stack Figure 10.1

  3. Pair 3 data PMD Pair 4 data One wire from pair 2 CSMA/CD CSMA/CD One wire from pair 1 100BaseT4 • 100 – Speed • Base – baseband • T – twisted pair • 4 – pairs Figure 10.2

  4. 100BaseTX • X - 2 pair (or 1- rare) • UDP CAT5 • MLT-3 • 4B/5B Figure 10.3: example MLT-3 Signal(0 0 0 0 1 1 1 0)  (1 1 1 1 0 1 1 1 0 0)

  5. 100BaseFX • F - Fiber • Separate send & receive fibers Figure 10.4: Repeater (Hub) Connection

  6. Repeater (or Hub) • Class 1 • Larger internal delay • One per Fast Ethernet Segment • Interfaces 100BaseFX  100BaseTX • Class 2 • Two allowed per segment • All nodes of the same type

  7. Network Diameter • Maximum distance (UDP) between repeaters – 5 meters • No cable exceeds 100 meters (check Hub specifications) • Maximum distance between switches – 2000 meters (using fiber)

  8. Expanding Network Diameter:Using An Ethernet Switch Figure 10.9

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