【论文】S-T-S交换网络的设计和研究.docx

S-T-S交换网络的设计和研究 I 摘 要 随着交换技术的日益发展，在人们的日常工作与生活中，交换网络起着越来 越重要的作用。而在交换网络中实现数字通信一般都需要对模拟信号进行数字化 处理，最常用的语音信号数字化采用PCM系统。作为程控数字交换机的核心， 数字交换网络主要由S/T数字接线器组成，能够直接交换从数字传输设备进来的 数字信号。在程控数字交换机中，多级交换的构成方法可以是用一个时分级把两 个空分级分开，形成空-时-空(S-T-S)交换网络。 本文首先介绍了程控数字交换系统，继而介绍了脉码调制技术。其次，详细 描述了T型时分接线器和S型时分接线器的工作原理，以及整个S-T-S型多级时 分交换网络的交换原理与交换过程。最后运用MATLAB模拟、仿真了S-T-S交换 网络，通过软件实现了交换过程。 关键词： 程控数字交换，PCM编码，T型时分接线器，S型空分接线器，S-T-S 交换网络 Ⅱ Abstract With the development of society, integrated circuit and continuously improve the integration of digital program-controlled telephone exchanges, greatly reduce the cost, only few decades, digital program-controlled telephone switchboard is replaced three times. The most staple is pulse code modulation(PCM)process, as the nucleus of Digital program-controlled switch network, T time-division connection device 、S time-division connection device are make full use of digital and non-blocked network. Compose a multi- level exchange may use a time-division connection to separate a space-division connection device, to form such a space-time-space(S-T-S)exchange network. Firstly, this paper introduces digital program-controlled exchange system, and then introduces digital foundation knowledge of speech signal emphatically, Such as transmission lines of code pattern and code pattern conversion.Furthermore, a detailed description principle of the model T time-division connection device and S time-division connection device, and the S-T-S exchange network at the exchange of multi-level network theory and exchange process. Finally using MATLAB simulate the S-T-S exchange network, through the software realize the exchange process. Key words: Digital program-controlled switch, Pulse code modulation (PCM),T time-division connection device, S time-division connection device, S-T-S exchange network S-T-S交换网络的设计和研究 Ⅲ 目 录 第 一 章 前 言 1 1.1 交 换 技 术 概 述 1 1