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九江学院毕业论文题目:公众电话交换网(PSTN)技术现状及及其未来发展方向的基础性探究专业:计算机通信年级:2008级姓名:倪良海学号:09指导教师:孙娟完成日期:2010年12月10日I摘要公众电话交换网作为一种最早建立起来的通信网，自从1876年贝尔发明电话，1898年史端乔发明自动交换机以来，电话已经成为人们日常生活、工作所必须的传输媒体，同时公众电话交换网为人类的通信需求做出了巨大的贡献，在通信发展历程中占据重要地位。随着3G的正式商用，各种智能业务、应用业务不断涌现，对传统的以窄带为基础的PSTN网络带来了巨大的冲击，PSTN即将推出通信舞台？然而PSTN网络通过20几年的发展，网络建设投资巨大，我们应该怎样保护运营商的巨大投资？怎样利用好当初的PSTN网络？PSTN的未来又在何方？本文从基础上详细说明了PSTN网络的结构、组成及相关技术，只有在充分了解PSTN的发展和技术现状的基础上，才能为其未来的发展指明正确的方向。同时也对PSTN的未来做出了科学有据的推断。【关键词】：公众电话交换网，软交换，交换IIAbstractSummaryofthepublicswitchedtelephonenetworkwasfirstestablishedasacommunicationnetwork,sinceBellinventedthetelephonein1876,1898,automaticallyswitchesthehistorysincetheendofQiaofaMing,thetelephonehasbecomeadailylife,workmustbethetransmissionmedium,whilethepublicswitchedtelephonenetworkcommunicationneedsofmankindmadeagreatcontributioninthedevelopmentprocessofcommunicationtooccupyanimportantposition.With3G'sofficialbusiness,smartbusiness,applicationbusinesscontinuetoemerge,thetraditionalnarrowbandPSTN-basednetworkshasbroughtahugeimpact,PSTNcommunicationupcomingstage?HoweverPSTNnetworkthrough20yearsofdevelopment,ahugenetworkofconstructioninvestment,howshouldweprotecttheoperator'shugeinvestment?HowtomakegooduseoftheoriginalPSTNnetwork?WhereisthefutureofPSTN?Inthispaper,basedonthedetaileddescriptionofthePSTNnetworkstructure,compositionandrelatedtechnologies,PSTNonlyinthefullunderstandingofthestatusofdevelopmentandtechnology,basedonitsfuturedevelopmentcanbeintherightdirection.ThefutureofthePSTNbutalsotomakeascientificinferencebasedonevidence.【Keywords】publicswitchedtelephonenetwork,PSTN,NGNIII第一章公众电话网的组成及结构...............................................................................................11.1公众电话网概述................................................................................................................11.2长途网及其结构的演变....................................................................................................11.3本地网...............................................................................................................................21.3.1本地网概述及交换中心职能................................................................................21.3.2本地网的网络结构................................................................................................3第二章公众电话网的编号计划...................................................................................................52.1编号计划概述....................................................................................................................52.1.1编号计划概念........................................................................................................52.1.2编号计划的编号要求............................................................................................52.2编号计划的具体方法........................................................................................................52.2.1长途电话用户编号方法........................................................................................52.2.2本地网中用户号码的组成....................................................................................6第三章电话网的路由选择...........................................................................................................73.1路由选择概念....................................................................................................................73.2路由选择的方式................................................................................................................7第四章电话信令网的组成与结构...............................................................................................84.1信令....................................................................................................................................84.1.1信令概述................................................................................................................84.1.2信令的分类............................................................................................................84.1.3七号信令组成........................................................................................................9第五章数字电路交换技术及交换示例.....................................................................................105.1数字交换技术..................................................................................................................105.1.1数字电路系统的硬件功能结构..........................................................................105.1.2数字电路交换系统软件功能结构......................................................................115.2交换网络实例..................................................................................................................15第六章PSTN用于数据接入的三种方式....................................................................................206.1拨号上网..........................................................................................................................206.2窄带综合业务数字网技术..............................................................................................216.2.1ISND概述......................................................................................