本文選題：無(wú)線ONU　切入點(diǎn)：VoIP語(yǔ)音網(wǎng)關(guān)　出處：《浙江工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,基于以太網(wǎng)無(wú)源光網(wǎng)絡(luò)(EPON)技術(shù)的光纖到戶已經(jīng)得到了廣泛的應(yīng)用。本文以EPON網(wǎng)絡(luò)中的具有無(wú)線接入功能的光網(wǎng)絡(luò)單元(ONU)為應(yīng)用對(duì)象,對(duì)無(wú)線ONU中的VolP語(yǔ)音網(wǎng)關(guān)部分的功能設(shè)計(jì)與軟、硬件實(shí)現(xiàn)進(jìn)行系統(tǒng)地研究,主要包括VoIP語(yǔ)音網(wǎng)關(guān)模塊的硬件設(shè)計(jì)和實(shí)現(xiàn)、嵌入式Linux系統(tǒng)的移植以及AC48802C-C芯片的驅(qū)動(dòng)程序設(shè)計(jì)等。本文的主要工作如下：1.闡述了EPON接入技術(shù),包括EPON接入網(wǎng)的網(wǎng)絡(luò)結(jié)構(gòu)、重要參數(shù)、性能優(yōu)勢(shì)等,對(duì)VolP的工作原理、關(guān)鍵技術(shù)以及發(fā)展前景做了介紹。在此基礎(chǔ)上,論證了在ONU中實(shí)現(xiàn)VoIP語(yǔ)音網(wǎng)關(guān)的可行性及優(yōu)越性。2.提出了一種集成于無(wú)線ONU的VoIP語(yǔ)音網(wǎng)關(guān)的設(shè)計(jì)方案,并完成了硬件系統(tǒng)的印制電路板設(shè)計(jì)與制作。該方案的硬件功能由嵌入式處理器芯片、數(shù)字信號(hào)處理芯片以及用戶線電路接口芯片實(shí)現(xiàn)。其中,嵌入式處理器芯片選用三星公司出品的S3C2440芯片,數(shù)字信號(hào)處理芯片選用奧科公司的AC48802C-C,用戶線電路接口芯片選用Le88221芯片。S3C2440嵌入式處理器作為整個(gè)系統(tǒng)的核心,負(fù)責(zé)整個(gè)嵌入式Linux系統(tǒng)的加載和運(yùn)行,實(shí)現(xiàn)控制管理功能；而數(shù)字信號(hào)處理芯片AC48802C-C主要負(fù)責(zé)語(yǔ)音壓縮編解碼和信令處理的功能。兩塊芯片通過(guò)8位的HPI接口實(shí)現(xiàn)信息交換,數(shù)字信號(hào)處理芯片通過(guò)HPI接口操作芯片的內(nèi)部寄存器,從而達(dá)到驅(qū)動(dòng)控制DSP的功能。3.實(shí)現(xiàn)了嵌入式Linux系統(tǒng)的移植和AC48802C-C芯片的驅(qū)動(dòng)程序設(shè)計(jì)。AC48802C-C驅(qū)動(dòng)程序包括硬件驅(qū)動(dòng)層、低階驅(qū)動(dòng)層和高階驅(qū)動(dòng)層。硬件層驅(qū)動(dòng)代碼通過(guò)宏指令和函數(shù)定義了嵌入式處理器與AC48802C-C連接的硬件接口；低階層驅(qū)動(dòng)代碼實(shí)現(xiàn)了嵌入式控制器與AC48802C-C之間的通信接口；高階層驅(qū)動(dòng)代碼實(shí)現(xiàn)了上位機(jī)軟件與AC48802C-C之間的通信與控制。此外,本文在PC平臺(tái)上對(duì)VoIP的呼叫過(guò)程進(jìn)行了軟件實(shí)現(xiàn),并利用抓包軟件對(duì)會(huì)議初始化協(xié)議(SIP)進(jìn)行了分析。
[Abstract]:At present, optical fiber access based on Ethernet passive optical network (EPON) technology has been widely used. In this paper, the optical network unit with wireless access function in EPON network is used as the application object. The function design, software and hardware implementation of VolP voice gateway in wireless ONU are systematically studied, including the hardware design and implementation of VoIP voice gateway module. The main work of this paper is as follows: 1. This paper describes the EPON access technology, including the network structure of EPON access network, important parameters, performance advantages and so on. The key technology and development prospect are introduced. On this basis, the feasibility and superiority of implementing VoIP voice gateway in ONU are demonstrated. A design scheme of VoIP voice gateway integrated with wireless ONU is proposed. The hardware function of this scheme is realized by embedded processor chip, digital signal processing chip and user line circuit interface chip. The embedded processor chip uses Samsung's S3C2440 chip, the digital signal processing chip is AC48802C-C, and the subscriber line circuit interface chip is Le88221 chip .S3C2440, which is the core of the whole system. It is responsible for the loading and running of the whole embedded Linux system, and realizes the control management function, while the digital signal processing chip AC48802C-C is mainly responsible for the functions of speech compression, codec and signaling processing. The two chips exchange information through 8-bit HPI interface. The digital signal processing chip operates the internal register of the chip through the HPI interface, so as to achieve the function of driving and controlling DSP. 3. The transplant of embedded Linux system and the driver program design of AC48802C-C chip. AC48802C-C driver includes hardware driver layer. The hardware layer driver code defines the hardware interface between the embedded processor and the AC48802C-C through macro instructions and functions, and the low level driver code realizes the communication interface between the embedded controller and the AC48802C-C. The high-level driver code realizes the communication and control between the host computer software and the AC48802C-C. In addition, the calling process of VoIP is implemented on the PC platform, and the meeting initialization protocol (SIP) is analyzed by using the packet grasping software.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.11;TN929.1
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本文編號(hào)：1651024