BDC5eChapter10 - Chapter 10: Ethernet and Fibre Cable...

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Chapter 10: Ethernet and Fibre Cable Business Data Communications, 5e
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Business Data Communications, 5e 2 Increase in High-Speed LANs Extraordinary growth in speed, power, and storage capacity of PCs Increasing use of LANs as computing platforms Examples Server farms Workgroups with “power” requirements High-speed backbones
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Business Data Communications, 5e 3 Increase in High-Speed LANs Fast Ethernet and Gigabit Ethernet Fibre Channel High-speed Wireless LANs
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Business Data Communications, 5e 4 Characteristics of Some High-Speed LANS
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Business Data Communications, 5e 5 Trends Influencing Emergence of High-Speed LANs Explosive growth of speed and computing power of PCs Recognition by MIS organizations of the value and importance of networked computing Centralized server farms Power workgroups High-speed local backbone
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Business Data Communications, 5e 6 Traditional Ethernet Ethernet and CSMA/CD (IEEE 802.3) Carrier sense multiple access with collision detection Four step procedure If medium is idle, transmit If medium is busy, listen until idle and then transmit If collision is detected, cease transmitting After a collision, wait a random amount of time before retransmitting
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Business Data Communications, 5e 7 Ethernet MAC Frame Format Preamble: 7-octet pattern of 0s &1s used to establish bit synchronization. Start Frame Delimiter (SFD): Indicates actual start of frame. Destination Address (DA): Specifies the station(s) for which the frame is intended Source Address (SA): Specifies the station that sent the frame. Length: Length of LLC data field in octets. LLC Data: Data unit supplied by LLC. Pad: Octets added to ensure that the frame is long enough for proper CD operation. Frame Check Sequence (FCS): A 32-bit CRC, based on all fields except preamble, SFD, and FCS.
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Business Data Communications, 5e 8 Ethernet MAC Frame
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Business Data Communications, 5e 9 802.3 Medium Notation Notation format: <data rate in Mbps><signaling method><maximum segment length in hundreds of meters> e.g 10Base5 provides 10Mbps baseband, up to 500 meters T and F are used in place of segment length for twisted pair and fiber
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Business Data Communications, 5e 10 802.3 10BaseX Media Options
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Business Data Communications, 5e 11 Bridges Allow connections between LANs and to WANs Used between networks using identical physical and link layer protocols Provide a number of advantages Reliability: Creates self-contained units Performance: Less contention Security: Not all data broadcast to all users Geography: Allows long-distance links
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Business Data Communications, 5e 12 Bridge Functions Read all frames from each network
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This note was uploaded on 04/27/2010 for the course BAMU BSC taught by Professor Kmm during the Spring '10 term at University of New York in Prague.

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BDC5eChapter10 - Chapter 10: Ethernet and Fibre Cable...

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