帧中继语音传送网关的设计与实现

1帧中继语音传送网关的设计与实现DesignandImplementationofVoiceOverFrameRelayTechnologyFrameRelayVoiceGateway2中文摘要我国公安专用通信网具有种类繁多、实时性要求高等业务特点，而带宽资源有限、多业务网并存、扩展能力差是当前存在的主要问题，本文为此提出了集“语音、数据、视频”为一体的综合通信网的技术实现方案。本文首先详细比较了时分复用、Pl、帧中继和ATM组网技术优缺点，确立了混合时分复用和PI技术的组网思路，并给出了组网模型，具有接口丰富、信道化复用、数据组网方式多样、经济适用等突出特点，很好地解决了公安专用网中存在的主要问题。本课题的主要目的是提出VoFR语音网关的软件设计方案，并完成VoFR协议模块的开发，实现语音数据在帧中继链路上的传输。本课题在硬件方面使用华为三康有限公司的8048路由器，该路由器采用了高性能低功耗PowerPC芯片为主控制处理器来处理各种语音信令。并以TI公司的TMS320－5X系列高性能数字信号处理芯片（DSP）处理语音数据和传真业务；软件方面采用Vxworks嵌入式操作系统进行VoFR协议模块的开发和编译。关键词：分组语音，帧中继，VoFR，VxWorks操作3ABSTRACTChinaPublicSecurityhasawiderangeofprivatecommunicationnetworks,real-timerequirementsofhigheroperatingcharacteristics,andbandwidthresourcesarelimited,thecoexistenceofmulti-servicenetwork,scalabilityisthecurrentdifferencebetweenthemainproblems,thispaperputforthasetofvoice,dataandvideofortheintegratedcommunicationnetworkoftechnologyprograms.Inthispaperadetailedcomparisonofthetimedivisionmultiplexing,Pl,advantagesanddisadvantagesofframerelayandATMnetworkingtechnologytoestablishamixedTDMandPItechnologynetworkingideas,andgivesthenetworkmodel,withabundantinterfaces,channelizedmultiplexing,multipledatanetworkingmode,economicalandotherprominentfeatures,agoodsolutiontoaspecificnetworksecuritythemainproblems.ThemainpurposeofthistaskistoproposeVoFRVoiceGatewaysoftwaredesignanddevelopmentofcompleteVoFRprotocolmodules,voicedataframerelaylinktransmission.ThesubjectoftheuseofthehardwareCo.,Ltd.Huawei-8048router,therouterusesahigh-performancelow-powerPowerPCchipsbasedvoicecontrolprocessortohandleavarietyofsignaling.AndtoTI'sTMS320-5Xseriesofhigh-performancedigitalsignalprocessingchip(DSP)processingvoicedataandfacsimileservices;software,embeddedoperatingsystemwithVxworksVoFRagreementtodevelopandbuildthemodule.KEYWORDS：Packetvoice,FrameRelay,VoFR,VxWorks4目录第一章绪论..................................................................................................................11.1论文背景简介..................................................................................................11.2分组语音概述..................................................................................................31.3分组网语音通信技术的基本原理..................................................................61.4分组语音技术在国内外的发展动态..............................................................61.5VxWorks操作系统及其应用..........................................................................81.5.1几种嵌入式操作系统的比较...............................................................81.5.2VxWorks操作系统简介.......................................................................81.5.3VxWorks的开发环境Tornado..........................................................101.5.4VxWorks系统启动流程.....................................................................111.6本课题的研究工作及论文安排....................................................................13第二章语音IP原理分析............................................................................................142.1帧中继语音传送的含义及特点本................................................................142.2帧中继语音传送的基本构成呼叫方式........................................................152.3帧中继语音传送语音技术的发展及应用现状...........................................152.4帧中继语音传送的关键技术........................................................................182.5帧中继语音传送在FRF.11专线方式下的处理流程..................................20第三章VoFR模块的设计............................................................................................223.1组件化模型设计............................................................................................223.2语音网关设计实现........................................................................................233.3帧中继协议模块的实现................................................................................283.4本章小结........................................................................................................30第四章VoFR协议模块的实现..................................................................................314.1VoFR协议模块的总体设计..........................................................................314.2呼叫控制块的设计........................................................................................364.3网络侧呼叫信令设计....................................................................................404.4帧中继呼叫状态的设计................................................................................434.5Switch呼叫方式..........................................................................................444.6Trunk呼叫方式............................................................................................474.7帧中继语音网关信令系统启动流程设计...................................................48第五章系统测试........................................................................................................495.1VoFR语音网关系统基本功能测试..............................................................505.2所设计的VoFR语音网关性能测试.............................................................515.3VoFR语音网关性能评价..............................................................................525.4本章小结...................