無線網(wǎng)路1(已修改)
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【正文】 無線網(wǎng)路 (1) 長庚大學資訊工程所 陳仁暉 Tel : (03) 2118800 ext. 5990 Email: CGU NDSL LAN2 Outline ? Midterm Exam 30% ? Final Exam 30% ? Presentation 40% CGU NDSL LAN3 Course Outline ? Wireless PAN ? IEEE (Bluetooth) ? IEEE (UltraWide Band, UWB) ? IEEE (ZigBee) ? Wireless LAN ? IEEE (WiFi) ? Wireless MAN ? IEEE (WiMAX, BWA) ? Wireless Networks Research Issues ? Routing ? Protocol Enhancement ? QoS Transmissions CGU NDSL LAN4 Introduction to Local Area Networks (LANs) CGU NDSL LAN5 What is a LAN ? ? A LAN is a data munication system allowing a number of independent devices to municate directly with each other, within a moderately sized geographic area over a physical munications channel of moderate data rates. CGU NDSL LAN6 Basic Requirements of a LAN ? Data rate of 1 to 1000 Mbps ? Geographic distances spanning at most 15 km ? Ability to support several hundred independent devices ? Minimal dependence on any centralized ponents or control ? Efficient use of shared resources, including the work channel ? Stability under high load ? Fair access (bandwidth, delay) to the work by all devices ? Reliability and good error characteristics ? Easy installation, reconfiguration and maintenance ? Low cost CGU NDSL LAN7 LAN Components ? Computers (Networking devices) ? Transmission System (Network Cards, Cabling) 傳輸媒介 : 同軸電纜 , 雙絞線 , 光纖 , radio 工作站 工作站 工作站 工作站 工作站 CGU NDSL LAN8 LAN Extension 網(wǎng)路區(qū)段 1 網(wǎng)路區(qū)段 2 訊號增益器 CGU NDSL LAN9 Network Topologies ? Star ? Single Star (IEEE 100VGAnyLAN, ATM) ? Multiple Star (Snowflake) (ATM) ? Bus ? Single Bus (IEEE CSMA/CD, IEEE TokenBus) ? Dual Bus (IEEE DQDB) ? Tree ? Ring ? Single Ring (IEEE Token Ring) ? Dual Ring (FDDI, FDDIII) ? Mesh ? Random (IEEE CSMA/CA) CGU NDSL LAN10 Network Topologies A C E A E B D B D F A E B D A E B D C E B D F A A B C C C C Star Ring Dual Ring Bus Tree Dual Bus CGU NDSL LAN11 Network Topologies A B C A B C D A
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