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Chapter 13 Wired LANs: Ethernet

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1 Chapter 13 Wired LANs: Ethernet
EE141 Chapter Wired LANs: Ethernet School of Computer Science and Engineering Pusan National University Jeong Goo Kim

2 Outline 13.1 Ethernet Protocol 13.2 Standard Ethernet
Ch. 13 Outline Outline Ethernet Protocol 13.2 Standard Ethernet 13.3 Fast Ethernet 13.4 Gigabit Ethernet Gigabit Ethernet

3 13.1 Ethernet Protocol 13.1 Ethernet Protocol
was developed at Xerox PARC between 1973 and 1974. was inspired by ALOHAnet, which Robert Metcalfe had studied as part of his PhD dissertation is based on CSMA/CD Metcalfe named it after the disproven Luminiferous ether as an “omnipresent, completely-passive medium for the propagation of electromagnetic waves.” By 2010, the market for Ethernet equipment amounted to over $16 billion per year.

4 Fig. 13.1 IEEE standard for LANs
13.1 Ethernet Protocol IEEE Project 802 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. Fig IEEE standard for LANs

5 Fig. 13.2 Ethernet evolution
13.1 Ethernet Protocol Ethernet Evolution Fig Ethernet evolution

6 13.2 Standard Ethernet 13.2 Standard Ethernet 13.2.1 Characteristics
Fig Ethernet frame

7 Fig. 13.4 Unicast and multicast addresses
13.2 Standard Ethernet Addressing The NIC(network interface card) provides the station with a 6-byte link-layer address. Ex. 13.2 4A:30:10:21:10:1A 47:20:1B:2E:08:EE FF:FF:FF:FF:FF:FF Fig Unicast and multicast addresses

8 Fig. 13.5 Implementation of standard Ethernet

9 CSMA/CD with 1-persistent method
13.2 Standard Ethernet Access Method CSMA/CD with 1-persistent method Efficiency of Standard Ethernet Efficiency = 1 / ( × a ) here, a = (propagation delay) / (transmission delay) and means the number of frames that can fit on the medium Ex. 13.3

10 Fig. 13.6 Encoding in a Standard Ethernet
Implementation Table 13.1 Summary of standard Ethernet Implementation Encoding and Decoding Fig Encoding in a Standard Ethernet

11 13.2 Standard Ethernet 10Base5: Thick Ethernet 10Base2: Thin Ethernet
Fig Base5 implementation 10Base2: Thin Ethernet Fig Base2 implementation

12 10Base-T: Twisted-Pair Ethernet
13.2 Standard Ethernet 10Base-T: Twisted-Pair Ethernet Fig Base-T implementation 10Base-F: Fiber Ethernet Fig Base2 implementation

13 13.2.6 Changes in the Standard
13.2 Standard Ethernet Changes in the Standard evolution of the Ethernet to become compatible with other high-data-rate LANs. Bridged Ethernet Raising the Bandwidth Separating Collision Domains Ex Sharing bandwidth

14 Ex. 13.12 A network with and without bridging
13.2 Standard Ethernet Ex A network with and without bridging

15 13.2 Standard Ethernet Ex Collision domains

16 13.2 Standard Ethernet Switched Ethernet Ex Switched Ethernet

17 Ex. 13.15 Full-duplex switched Ethernet
13.2 Standard Ethernet Full-Duplex Ethernet No Need for CSMA/CD MAC Control Layer Ex Full-duplex switched Ethernet

18 13.3 Fast Ethernet 13.3 Fast Ethernet
In the 1990s, Ethernet made a big jump by increasing the transmission rate to 100 Mbps. to compete with higher transmission rate LAN such as FDDI. The goals of Fast Ethernet upgrade the data rate to 100 Mbps Make it compatible with Standard Ethernet Keep the same 48-bit address Keep the same frame format

19 13.3 Fast Ethernet Access Method passive hub and star topology, limit to 250m link-layer switch with full-duplex connection Autonegotiation To allow incompatible devices to connect to one another To allow on device to have multiple capabilities To allow a station to check a hub’s capabilities

20 Fig. 13.16 Encoding for fast Ethernet
Physical Layer Fig Encoding for fast Ethernet Table Summary of Fast Ethernet implementation

21 13.4 Gigabit Ethernet 13.4 Gigabit Ethernet IEEE standard 802.3z
upgrade the data rate to 1 Gbps, keep the address length, the frame format, and the maximum and minimum frame length the same. support autonegotiation as defined in Fast Ethernet MAC Sublayer full-duplex no collision, no CSMA/CD allmost all implementation half-duplex rare collision might be occur, CSMA/CD should be used

22 Fig. 13.17 Encoding in Gigabit Ethernet
Physical Sublayer Fig Encoding in Gigabit Ethernet Table Summary of Gigabit Ethernet implementation

23 13.5 10-Gigabit Ethernet 13.5 10-Gigabit Ethernet
upgrade the data rate to 10 Gbps IEEE standard 802.3ae enlarge the coverage distance to metropolitan areas. Implementation full-duplex no collision, no CSMA/CD Table Summary of 10-Gigabit Ethernet implementation

24 Homework Homework Solve Problems P13-3, P13-3, P13-5, P13-8, P13-10 Read textbook pp Next Lecture Chapter 14. Other Wired Networks

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