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所在平台: Udemy |
课程主页: https://www.udemy.com/course/pdh-sdh-otn-dwdm-multiplexing-for-telecom-transmission/
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本Coursera课程“PDH, SDH & OTN (复用) 电信传输”旨在为电信传输领域的研究者、工程师和学生提供全面的知识体系。课程从电信传输的基本原理讲起，逐步深入到现代高速网络构建的核心技术。 **第一部分：引言** 本部分首先阐述电信传输网络中的复用概念，包括频分复用（FDM）及其标准层级。随后介绍数字交换的发展历程，重点讲解模拟到数字的转换，以及E-1和T-1等时分复用（TDM）标准。最后，引入准同步数字体系（PDH）的概念。 **第二部分：物理传输介质** 此部分聚焦于电信传输所依赖的物理介质。内容涵盖了微波通信的概览，以及光纤通信的基础知识，包括全内反射原理、光纤类型（多模阶跃型、多模渐变型、单模光纤）、模间色散、衰减以及光通信使用的波长窗口。 **第三部分：同步数字体系（SDH）** 本部分是课程的核心，详细介绍了同步数字体系（SDH）。首先分析了PDH的局限性，并引出SDH的概念。课程会讲解SDH的比特率，以及SDH如何兼容PDH信号，并阐述PDH到SDH转换的复用结构。重点讲解STM-1帧格式，以及E4、E3、E1信号到STM-1的转换过程。此外，还将介绍SDH网络中的关键设备，如再生器、终端复用器、交叉连接器（DXC），以及SDH的网络拓扑（点对点、点对多点、网状、环网）。最后，深入剖析SDH的开销字节，包括再生段开销（RSOH）、管理单元指针（AU Pointer）、复用段开销（MSOH），并讲解自动保护倒换机制，如线性保护、单向环保护（线路和通道倒换）以及双向环保护（线路倒换）。 **第四部分：SDH与WDM结合应用** 此部分探讨了SDH技术与波分复用（WDM）技术的结合。内容将介绍WDM的概念、优势，对比CWDM与DWDM系统，并介绍光监控通道（OSC）和光分插复用器（OADM）等关键设备。 **第五部分：光传输网络（OTN）** 最后一部分关注光传输网络（OTN）。课程将解释从SDH迁移到OTN的动因，介绍OTN的定义，以及向分组传输网络迁移的趋势。还将探讨为何不直接在WDM上传输IP，并详细讲解OTN的网络接口功能和3R再生，以及客户端信号如何映射到光通道（OCh）及其结构。接着，深入分析OTN的层次架构，介绍OTN的初始数据速率和复用结构。对光传输模块（OTM）及其不同类型（全功能OTM、缩减功能OTM、单波长OTM）进行讲解，并介绍ODU0（用于高效传输1GbE）和ODUflex（灵活的光通道数据单元）等概念。最后，会分析常用的ODU容器，并详细解释OPU、ODU（包括通道监控PM和串联连接监控TCM）以及OTU的开销字节。
Welcome to the course "PDH, SDH & OTN (Multiplexing) for Telecom Transmission". Telecom Transmission is the backbone of modern global telecommunications. Multiplexing is used to send multiple signals over a common high capacity transmission media, such as copper, microwave link or optical fiber. Whether you're an engineer, network professional, or a student eager to master telecom transmission technologies, this comprehensive course is designed to take you from foundational concepts to advanced optical networking.You'll begin with the basic principles of multiplexing and the evolution of telecom exchanges, moving through fiber optics fundamentals, then mastering Synchronous Digital Hierarchy (SDH). Finally, you'll explore the world of Wavelength Division Multiplexing (WDM) and Optical Transport Networks (OTN), understanding how high-speed networks are built and maintained today.Course Outline:Section 1: IntroductionWhat is Multiplexing in Telecom Transmission Networks?Frequency Division Multiplexing (FDM) and its Standard HierarchyDigital Exchanges: Analogue to Digital ConversionE-1 and T1 standard for TIme Division Multiplexing in Digital exchangesPlesiochronous Digital Hierarchy (PDH)Section 2: The Physical Transmission MediumWhat is Telecom Transmission Medium?Microwave Communication OverviewWhat is Optical Fiber Communication?Total Internal Reflection as basic Principle of Optical CommunicationTypes Of Optical FiberMultimode Step Index Fiber and Modal DispersionMultimode Graded Index FiberSingle Mode Optical FiberAttenuation And The Wavelength Windows Used For Optical CommunicationSection 3:Synchronous Digital Hierarchy (SDH)Disadvantages of PDHIntroduction to Synchronous Digital Hierarchy (SDH)SDH Bit RatesSDH Accommodates the Existing PDH Signals as its InputBasic SDH Operations & Overall Multiplexing Structure For PDH to SDH ConversionSynchronous Transport Module (STM)-1 Frame FormatE4 to STM-1 Conversion in SDHE3 to STM-1 Conversion in SDHE1 to STM-1 ConversionNetwork Elements of SDH: RegeneratorMultiplexers: Terminal & Add-Drop MultiplexersDigital Cross-Connect (DXC)SDH Network Topology Types: Point to Point Network TopologyPoint-to-Multipoint Network TopologyMesh Network TopologyRing Network TopologySDH Overheads ClassificationUnderstanding main sections of SDH PathRegenerator Section Overhead (RSOH) InformationAU Pointer (Administrative Unit Pointer) InformationMultiplex Section Overhead (MSOH) InformationAutomatic Protection Switching: Linear Protection MechanismUnidirectional Ring Protection-Line SwitchingUnidirectional Ring Protection-Path SwitchingBidirectional Ring Protection-Line SwitchingSection 4:Using SDH Technology with Wavelength Division Multiplexing (WDM)Wavelength Division Multiplexing (WDM) ConceptAdvantages of WDM TechnologyCWDM Vs DWDM SystemsOptical Supervisory channel (OSC)Optical Add Drop Multiplexer (OADM)Section 5:Optical Transport Network (OTN)Why Transition from SDH to OTN?What is an Optical Transport Network (OTN)?Migration to Packet Transport NetworkingWhy not IP directly over WDM?OTN Network Interface & 3R Regeneration FunctionClient Signal Mapping into Optical ChannelOptical Channel (OCh) StructureOTN Layered ArchitectureInitial OTN Data RatesOTN Multiplexing StructureWhat is Optical Transport Module (OTM)Optical Transport Modules TypesOTM-n.m(Full Function OTM) SignalOTM-nr.m (Reduced Function OTM) SignalOTM-0-m (Single Wavelength OTM) signalODU0-Efficient Transport of 1GbEODUflex-Flexible Optical Channel Data UnitCommonly Used ODU ContainersOPU Overhead Bytes ExplainedODU Overhead Bytes-Path Monitoring (PM)ODU Overhead Bytes-Tandem Connection Monitoring (TCM)Other ODU Overhead BytesOTU overhead Bytes
