U of I CS 438 - Direct Link Networks (10 pages)

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Direct Link Networks



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Direct Link Networks

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Pages:
10
School:
University of Illinois
Course:
Cs 438 - Communication Networks
Communication Networks Documents

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Direct Link Networks Direct Link Networks Two hosts connected directly No issues of contention routing Key points Physical Connections Encoding and Modulation Framing Error Detection 9 6 06 Internet Protocols User level software Session Transport 2 Outline Application Presentation UIUC CS ECE438 Fall 2006 Hardware building blocks Encoding Framing Kernel software Network Data Link Physical 9 6 06 Framing error detection medium access control Encoding Hardware network adapter UIUC CS ECE438 Fall 2006 3 Hardware Building Blocks 9 6 06 4 Copper based Media Hosts general purpose computers Switches typically special purpose hardware Routers varied Links UIUC CS ECE438 Fall 2006 Links Copper Nodes 9 6 06 Category 5 Twisted Pair ThinNet Coaxial Cable ThickNet Coaxial Cable 10 100Mbps 10 100Mbps 10 100Mbps 100m 200m 500m twisted pair Copper wire with electronic signaling Glass fiber with optical signaling Wireless with electromagnetic radio infrared microwave signaling UIUC CS ECE438 Fall 2006 coaxial cable coax 5 9 6 06 copper core insulation braided outer conductor outer insulation UIUC CS ECE438 Fall 2006 6 1 Links Optical Links Optical Optical Media Multimode Fiber 100Mbps Single Mode Fiber 100 2400Mbps Single mode 2km 40km Lower attenuation longer distances Lower dispersion higher data rates Multimode fiber Cheap to drive LED s vs lasers for single mode Easier to terminate core of single mode fiber glass core the fiber glass cladding plastic jacket optical fiber 1 wavelength thick 1 micron core of multimode fiber same frequency colors for clarity O 100 microns thick 9 6 06 UIUC CS ECE438 Fall 2006 7 Links Optical Higher bandwidths Superior attenuation properties Immune from electromagnetic interference No crosstalk between fibers Thin lightweight and cheap the fiber not the optical electrical interfaces 9 6 06 UIUC CS ECE438 Fall 2006 9 Wireless POTS 64Kbps ISDN 128Kbps ADSL 1 5 8Mbps 16 640Kbps Cable Modem 0 5 2Mbps DS1 T1 1 544Mbps DS3 T3 44 736Mbps STS 1 51 840Mbps



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