西安电子科技大学：《计算机通信与网络》课程教学课件（讲稿）第三部分 数据链路层 第17章 广域网SONET、SDH

Data Communications and Networking Forouzan Fourth Edition Chapter 17 广域网SONET/SDH 17.1 Copyright The McGraw-Hill Companies,Inc.Permission required for reproduction or display

17.1 Chapter 17 广域网SONET/SDH Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display

Note SONET由ANSI制定； SDH由TU-T制定. SONET(Synchronous Optical Network,同步光纤网络) SDH(Synchronous Digital Hierarchy,同步数字体系) 17.2

17.2 SONET由ANSI制定; SDH由ITU-T制定. Note SONET (Synchronous Optical Network,同步光纤网络) SDH (Synchronous Digital Hierarchy,同步数字体系)

17-1体系结构 首先介绍SONET系统的体系结构：信号、设备和连 接。 Topics discussed in this section: 信号Signals SONET设备SONET Devices 连接Connections 17.3

17.3 17-1 体系结构 首先介绍SONET系统的体系结构：信号、设备和连 接. 信号 Signals SONET设备 SONET Devices 连接 Connections Topics discussed in this section:

Table17.1 SONET/SDH速率 STS oc Rate (Mbps) STM STS-1 0C-1 51.840 STS-3 0C-3 155.520 STM-1 STS-9 0C-9 466.560 STM-3 STS-12 0C-12 622.080 STM-4 STS-18 OC-18 933.120 STM-6 STS-24 0C-24 1244.160 STM-8 STS-36 0C-36 1866.230 STM-12 STS-48 0C-48 2488.320 STM-16 STS,synchronous transport signal,同步传输信号 OC,optical carrier,光载波 STM,synchronous transport module,同步传输模块

17.4 Table 17.1 SONET/SDH速率 STS,synchronous transport signal,同步传输信号 OC,optical carrier，光载波 STM,synchronous transport module,同步传输模块

Figure17.1使用SONET设备的简单网络 ADM:Add/drop multiplexer R:Regenerator STS MUX:Synchronous transport signal multiplexer T:Terminal STS DEMUX:Synchronous transport signal demultiplexer STS ADM STS MUX DEMUX Add YDrop Section Section Section Section Section Line Line Path 17.5

17.5 Figure 17.1 使用SONET设备的简单网络

17-2 SONET层 SONET标准包括四个功能层：光子层(photonic layer),段层(section layer),线路层(line layer)),路径 层(path layer).它们对应于物理层和数据链路层 Topics discussed in this section: 路径层Path Layer 线路层Line Layer 段层Section Layer 光子层Photonic Layer 设备-层之间的关系Device-Layer Relationships 17.6

17.6 17-2 SONET层 SONET标准包括四个功能层：光子层(photonic layer), 段层(section layer), 线路层(line layer), 路径 层(path layer). 它们对应于物理层和数据链路层. 路径层 Path Layer 线路层 Line Layer 段层 Section Layer 光子层 Photonic Layer 设备-层之间的关系 Device–Layer Relationships Topics discussed in this section:

Note SONET定义了四层： 路径、线路、段和光子层. 17.7

17.7 SONET 定义了四层: 路径、线路、段和光子层. Note

Figure17.2 SONET层与OSI或因特网层比较 Path layer Line layer Data link Section layer Physical Photonic layer 17.8

17.8 Figure 17.2 SONET 层与OSI或因特网层比较

Figure17.3 SONET中的设备-层关系 Electric signal Electric signal Path Path Line Line Section Section Photonic Photonic Optical signal Optical signal Optical signal Optical signal Regenerator Regenerator STS STS MUX DEMUX Add/drop multiplexer 17.9

17.9 Figure 17.3 SONET中的设备-层关系

17-3 SONET帧 每个同步传输信号STS-n由8000个帧组成.每个帧是 个90×n列、9行的二维矩阵. Topics discussed in this section: 帧、字节和位传输Frame,Byte,and Bit Transmission STS-1帧格式STS-1 Frame Format 封装Encapsulation 17.10

17.10 17-3 SONET帧 每个同步传输信号STS-n由8000个帧组成. 每个帧是 个90 × n 列、9行的二维矩阵. 帧、字节和位传输 Frame, Byte, and Bit Transmission STS-1帧格式 STS-1 Frame Format 封装 Encapsulation Topics discussed in this section: