集成于无线ONU的VoIP语音网关设计和实现

发布时间：2018-03-23 00:12

  本文选题：无线ONU　切入点：VoIP语音网关　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前,基于以太网无源光网络(EPON)技术的光纤到户已经得到了广泛的应用。本文以EPON网络中的具有无线接入功能的光网络单元(ONU)为应用对象,对无线ONU中的VolP语音网关部分的功能设计与软、硬件实现进行系统地研究,主要包括VoIP语音网关模块的硬件设计和实现、嵌入式Linux系统的移植以及AC48802C-C芯片的驱动程序设计等。本文的主要工作如下：1.阐述了EPON接入技术,包括EPON接入网的网络结构、重要参数、性能优势等,对VolP的工作原理、关键技术以及发展前景做了介绍。在此基础上,论证了在ONU中实现VoIP语音网关的可行性及优越性。2.提出了一种集成于无线ONU的VoIP语音网关的设计方案,并完成了硬件系统的印制电路板设计与制作。该方案的硬件功能由嵌入式处理器芯片、数字信号处理芯片以及用户线电路接口芯片实现。其中,嵌入式处理器芯片选用三星公司出品的S3C2440芯片,数字信号处理芯片选用奥科公司的AC48802C-C,用户线电路接口芯片选用Le88221芯片。S3C2440嵌入式处理器作为整个系统的核心,负责整个嵌入式Linux系统的加载和运行,实现控制管理功能；而数字信号处理芯片AC48802C-C主要负责语音压缩编解码和信令处理的功能。两块芯片通过8位的HPI接口实现信息交换,数字信号处理芯片通过HPI接口操作芯片的内部寄存器,从而达到驱动控制DSP的功能。3.实现了嵌入式Linux系统的移植和AC48802C-C芯片的驱动程序设计。AC48802C-C驱动程序包括硬件驱动层、低阶驱动层和高阶驱动层。硬件层驱动代码通过宏指令和函数定义了嵌入式处理器与AC48802C-C连接的硬件接口；低阶层驱动代码实现了嵌入式控制器与AC48802C-C之间的通信接口；高阶层驱动代码实现了上位机软件与AC48802C-C之间的通信与控制。此外,本文在PC平台上对VoIP的呼叫过程进行了软件实现,并利用抓包软件对会议初始化协议(SIP)进行了分析。
[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.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.11;TN929.1
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本文编号：1651024