小型数字程控交换机的设计与实现
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摘要
近年来，在我国通信技术的发展势头十分迅猛。以电路交换和数字程控交换技术为基础的电话网更是在整个通信网中占据着重要的地位。本文结合课题首先介绍了程控交换机的发展状况，对模拟交换机和数字交换机进行了性能比较，并指出未来数字交换机的发展方向。然后详细介绍了实现交换机由模拟向数字转变的关键技术——脉冲编码调制(PCM)技术的原理。第三章具体介绍了本设计的硬件电路，对主要功能模块结合功能框图进行了分析，并对设计用到的专用芯片如语音处理AM79C03、交换网络MT8980D等进行了说明，给出了与单片机的接口电路。尤其对于收号器MT8870的使用、信号音的产生电路是本设计的难点，具有数字程控交换的特点，需要占用PCM时隙来完成其功能。第四章是整个电路的软件设计，用来完成用户之间的呼叫处理过程，实现用户之间的通话。本文给出了详尽的设计流程。
本文完成了数字交换机在局域网内功能的研究，并完成了硬件电路的设计与实现，达到了设计目的。
In recent years the communicating technology has advanced rapidly in our country. The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks. The text firstly introduces the status of the program controlled exchange, and compares simulative exchange with digital exchange in the performance, and points out the developing direction of the future digital
exchange. Then the text describes the principle of the pivotal technique-
Pulse Code Modulation (PCM) in detail which realizes the conversion of the exchange from simulation to digital. The third chapter introduces the hardware and analyzes the primary function modules with the function diagrams, and illuminates the uses and the interface with the singlechip of the special chips such as audio processing circuit AM79C03, digital switch MT8980 and so on. The difficulties of the text are the use of the integrated DTMF receiver MT8870 and the signal generator circuit. Their realities need occupy the PCM timeslots. They are the characters of the digital program controlled exchange. The forth chapter is the software design which deals with the telephone call between the users and implements the transfer of their voices.
The text provides the detailed program flow , and completes the research and the hardware design of the digital program controlled exchange in local area network.
本文完成了数字交换机在局域网内功能的研究，并完成了硬件电路的设计与实现，达到了设计目的。
In recent years the communicating technology has advanced rapidly in our country. The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks. The text firstly introduces the status of the program controlled exchange, and compares simulative exchange with digital exchange in the performance, and points out the developing direction of the future digital
exchange. Then the text describes the principle of the pivotal technique-
Pulse Code Modulation (PCM) in detail which realizes the conversion of the exchange from simulation to digital. The third chapter introduces the hardware and analyzes the primary function modules with the function diagrams, and illuminates the uses and the interface with the singlechip of the special chips such as audio processing circuit AM79C03, digital switch MT8980 and so on. The difficulties of the text are the use of the integrated DTMF receiver MT8870 and the signal generator circuit. Their realities need occupy the PCM timeslots. They are the characters of the digital program controlled exchange. The forth chapter is the software design which deals with the telephone call between the users and implements the transfer of their voices.
The text provides the detailed program flow , and completes the research and the hardware design of the digital program controlled exchange in local area network.
引文
[1]．姚应俊．数字程控电话交换机原理与使用[M]．1994
[2] 樊昌信，詹道庸等．通信原理[M]．北京：国防工业出版社，1995．
[3] 叶敏．程控数字交换与现代通信网[M]．北京：北京邮电大学出版社，1998．
[4] 金淮丰，韩春光．程控数字交换技术[M]．北京：电子工业出版社，2002．
[5] 顾巨峰，周浩洋，朱健华．基于可编程逻辑器件(Lattice)的多功能数字频率计．《电子工程师》2002/28/1(28-32)．
[6] 江世明8051系列单片机与MT8880收发器接口技术．《电子技术》2002/29/4 (38-41)．
[7] MT8980D ISO-CMOS ST-BUS~(TM) FAMILY ISSUE8 March 1997
[8] MSAN-123 The MT8980 and the MT8981 Digital Crosspoint Switches ISSUE 1 June 1986
[9] MSAN-129 Time Space Switching 8,16 or 32 kbps Channels using the MT8980 ISSUE1 April 1987
[10] Am79c02/03/031 (A) Dual Subscriber Line Audio Processing Circuit(DSLAC~(TM)Devices ISSUE December 1999
[11] 史德嘉 单片机微处理器AT89C51在时隙变换和控制中的应用《国外电子元器件》2001/6
[12] 张培仁 基于C语言编程MCS-51单片机原理与应用[M] 北京：清华大学出版社，2003
[13] 马忠梅，籍顺心等 单片机的C语言应用程序设计[M]北京：北京航空航天大学出版社，1999
[14] 谭浩强 C程序设计(第二版)[M】北京：清华大学出版社，1999
[15] 孙涵芳，徐爱卿 MCS-51/96系列单片即原理及应用(修订版)[M] 北京：北京航空航天出版社，1996
[16] 徐爱钧，彭秀华 单片及高级语言C51应用程序设计[M] 北京：电子工业出版社，1998
[17] 李广弟 单片机基础[M] 北京：北京航空航天出版社，1994
[18] 周健 数字程控交换机的设计与开发 北京理工大学硕士论文 1999/1
[19] 杨承宏 小型程控交换机的动态时隙分配 北京大学硕士论文
[20] 解春风ISDN U接口(网络侧)的设计与技术实现 上海交通大学硕士论文 1998
[21] 谭宝成，王鹏 基于DTMF的智能电话控制器《单片机与嵌入式系统应用》西安工业学院
[22] 高盛涛，王平 系统内的PLD 《电子产品世界》
[2] 樊昌信，詹道庸等．通信原理[M]．北京：国防工业出版社，1995．
[3] 叶敏．程控数字交换与现代通信网[M]．北京：北京邮电大学出版社，1998．
[4] 金淮丰，韩春光．程控数字交换技术[M]．北京：电子工业出版社，2002．
[5] 顾巨峰，周浩洋，朱健华．基于可编程逻辑器件(Lattice)的多功能数字频率计．《电子工程师》2002/28/1(28-32)．
[6] 江世明8051系列单片机与MT8880收发器接口技术．《电子技术》2002/29/4 (38-41)．
[7] MT8980D ISO-CMOS ST-BUS~(TM) FAMILY ISSUE8 March 1997
[8] MSAN-123 The MT8980 and the MT8981 Digital Crosspoint Switches ISSUE 1 June 1986
[9] MSAN-129 Time Space Switching 8,16 or 32 kbps Channels using the MT8980 ISSUE1 April 1987
[10] Am79c02/03/031 (A) Dual Subscriber Line Audio Processing Circuit(DSLAC~(TM)Devices ISSUE December 1999
[11] 史德嘉 单片机微处理器AT89C51在时隙变换和控制中的应用《国外电子元器件》2001/6
[12] 张培仁 基于C语言编程MCS-51单片机原理与应用[M] 北京：清华大学出版社，2003
[13] 马忠梅，籍顺心等 单片机的C语言应用程序设计[M]北京：北京航空航天大学出版社，1999
[14] 谭浩强 C程序设计(第二版)[M】北京：清华大学出版社，1999
[15] 孙涵芳，徐爱卿 MCS-51/96系列单片即原理及应用(修订版)[M] 北京：北京航空航天出版社，1996
[16] 徐爱钧，彭秀华 单片及高级语言C51应用程序设计[M] 北京：电子工业出版社，1998
[17] 李广弟 单片机基础[M] 北京：北京航空航天出版社，1994
[18] 周健 数字程控交换机的设计与开发 北京理工大学硕士论文 1999/1
[19] 杨承宏 小型程控交换机的动态时隙分配 北京大学硕士论文
[20] 解春风ISDN U接口(网络侧)的设计与技术实现 上海交通大学硕士论文 1998
[21] 谭宝成，王鹏 基于DTMF的智能电话控制器《单片机与嵌入式系统应用》西安工业学院
[22] 高盛涛，王平 系统内的PLD 《电子产品世界》