13.1 Chapter 13 Wired LANs: Ethernet Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

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13.1 Chapter 13 Wired LANs: Ethernet Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

IEEE STANDARDS In 1985, the Computer Society of the IEEE started a project, called Project 802, to set standards to enable intercommunication among equipment from a variety of manufacturers. Project 802 is a way of specifying functions of the physical layer and the data link layer of major LAN protocols. Data Link Layer Physical Layer Topics discussed in this section:

13.3 Figure 13.1 IEEE standard for LANs

13.4 Figure 13.2 HDLC frame compared with LLC and MAC frames

STANDARD ETHERNET The original Ethernet was created in 1976 at Xerox’s Palo Alto Research Center (PARC). Since then, it has gone through four generations. We briefly discuss the Standard (or traditional) Ethernet in this section. MAC Sublayer Physical Layer Topics discussed in this section:

13.6 Figure 13.3 Ethernet evolution through four generations

13.7 Figure MAC frame

13.8 Figure 13.5 Minimum and maximum lengths

13.9 Frame length: Minimum: 64 bytes (512 bits) Maximum: 1518 bytes (12,144 bits) Note

13.10 Figure 13.8 Categories of Standard Ethernet

13.11 Figure 13.9 Encoding in a Standard Ethernet implementation

13.12 Figure Base5 implementation

13.13 Figure Base2 implementation

13.14 Figure Base-T implementation

13.15 Figure Base-F implementation

13.16 Table 13.1 Summary of Standard Ethernet implementations

CHANGES IN THE STANDARD The 10-Mbps Standard Ethernet has gone through several changes before moving to the higher data rates. These changes actually opened the road to the evolution of the Ethernet to become compatible with other high-data-rate LANs. Bridged Ethernet Switched Ethernet Full-Duplex Ethernet Topics discussed in this section:

13.18 Figure Sharing bandwidth

13.19 Figure A network with and without a bridge

13.20 Figure Collision domains in an unbridged network and a bridged network

13.21 Figure Switched Ethernet

13.22 Figure Full-duplex switched Ethernet

FAST ETHERNET Fast Ethernet was designed to compete with LAN protocols such as FDDI or Fiber Channel. IEEE created Fast Ethernet under the name 802.3u. Fast Ethernet is backward-compatible with Standard Ethernet, but it can transmit data 10 times faster at a rate of 100 Mbps. MAC Sublayer Physical Layer Topics discussed in this section:

13.24 Figure Fast Ethernet topology

13.25 Figure Fast Ethernet implementations

13.26 Figure Encoding for Fast Ethernet implementation

13.27 Table 13.2 Summary of Fast Ethernet implementations

GIGABIT ETHERNET The need for an even higher data rate resulted in the design of the Gigabit Ethernet protocol (1000 Mbps). The IEEE committee calls the standard 802.3z. MAC Sublayer Physical Layer Ten-Gigabit Ethernet Topics discussed in this section:

13.29 In the full-duplex mode of Gigabit Ethernet, there is no collision; the maximum length of the cable is determined by the signal attenuation in the cable. Note

13.30 Figure Topologies of Gigabit Ethernet

13.31 Figure Gigabit Ethernet implementations

13.32 Figure Encoding in Gigabit Ethernet implementations

13.33 Table 13.3 Summary of Gigabit Ethernet implementations

13.34 Table 13.4 Summary of Ten-Gigabit Ethernet implementations