BDC4e Chapter 15 - Chapter 15: LAN Systems Business Data...

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Chapter 15: LAN Systems Business Data Communications, 4e
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Business Data Communications, 4e 2 High-Speed LANs Why? 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, 4e 3 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, 4e 4 802.3 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, 4e 5 802.3 10BaseX Media Options
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Business Data Communications, 4e 6 Fast Ethernet (100Mbps) Easy to integrate with existing systems Can use UTP (-TX) or fiber (-FX) Uses star-wired topology, using a central multiport repeater (broadcast method) If NICs support full-duplex mode, switched hub must be used
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Business Data Communications, 4e 7 802.3 100Base-T Options
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Business Data Communications, 4e 8 802.3 100BaseX Media Options
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BDC4e Chapter 15 - Chapter 15: LAN Systems Business Data...

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