区域网路的技术发展-东华大学.ppt

網路技術管理進階班---區域網路的技術發展 講師 : 陳鴻彬 國立東華大學 電子計算機中心 0 LAN的基本條件 Data rate of 1 to 100 Mbps Geographic distances spanning at most 1-5 km Ability to support several hundred independent devices Simplicity, or use of the simplest mechanisms that have the required functionality and performance LAN的特性 Reliability Minimal dependence on any centralized components or control Efficient use of shared resources, including the network channel Stability under high load Fair access (bandwidth, delay) to the network by all devices LAN的特性 Easy installation Ease of reconfiguration and maintenance Low cost 區域網路之結構 Computers (Networking devices) Transmission System (Network Cards, Cabling) LAN Extension Layering Concept Layering Protocols 通信協定機本功能 Encapsulation/Decapsulation Segmentation/Reassembly Connection Establishing Flow Control Error Control Multiplexing 資料傳送之拆裝過程 IEEE Project 802 Standards IEEE 802.1 High Level Interface IEEE 802.1D Local Bridge (Spanning Tree Algorithm) IEEE 802.1G Remote Bridge IEEE 802.2 LLC (Logical Link Control) IEEE 802.3 CSMA/CD (Carrier Sense Multiple Access with Collision Detection IEEE Project 802 Standards IEEE 802.4 Token-Bus IEEE 802.5 Token-Ring IEEE 802.6 DQDB (Distributed Queue Dual Bus) IEEE 802.7 Broadband Technical Advisory Group IEEE 802.8 Fiber Optic Technical Advisory Group IEEE Project 802 Standards IEEE 802.9 Integrated Voice and Data LAN Working Group IEEE 802.10 LAN Security Working Group IEEE 802.11 Wireless LAN IEEE 802.12 Demand-Priority (100VG-AnyLAN) IEEE Project 802 Standards 基頻 / 寬頻 BaseBand 數位式信號 雙向性傳輸 TDM (Time Division Multiplexer)技術 數公里遠 基頻 / 寬頻 BroadBand 類比式信號 單向性傳輸 FDM (Frequency Division Multiplexer)技術 數十公里遠 IEEE 802.3 CSMA/CD Carrier Sense Multiple Access with Collision Detection 載波多重存取/碰撞偵測 Base Band 10 Base 2 5 Segaments 30台/Seg 185M/Seg RG58 A/U IEEE 802.3 10 Base 5 5 Segaments 100台/Seg 500M/Seg RG-11 10 Base T UTP IEEE 802.3 10 Base F Fiber Optical (MM) 10 Mbps Ethernet IEEE 802.4 Token Bus 75 ?, CATV Cable Broad