数字交换技术

话音网络随着数字交换技术和VoIP技术的发展而发展，下一代网络（NGN）已经成为未来网络的发展方向，文章给出了一些关于NGN的概述。

Voice network develops upon digital switching and VoIP technologies . And now next generation network ( NGN ) has been expected as the development trend . This paper gives some general information about NGN .

本文分析了数字交换技术的原理，介绍了Altera器件的结构和MAX+PLUSⅡ设计软件。

This paper analyses the principle of the digital switching technology and describes the structure of Altera chips and its design software named MAX + PLUS II .

随着数据及3G业务的快速发展，高速数字交换技术和密集波分复用的应用越来越广泛，这使得越来越多的信息业务集中到较少的节点和线路上。

With the development of the data and 3G service , the application of the high rate digital transmission and dense wavelength division multiplexing is more and more broad . so many information services need to concentrated the information to the less node or the line .

程控数字交换技术，是现代通信技术的重要组成部分，也是通信工程专业学生必须选修的课程之一，而时隙交换是程控数字交换技术中的核心内容，也是未来新的交换技术的基础。

Program controlled data exchange is important component in modern communication technology .

数字交换技术的现状与前景

Current Situation and Future of the Technologies of Digital Switch

针对我院通信工程专业的主干专业基础课程程控数字交换技术教学中存在的问题，对这门讲授实际技术的课程的基本结构进行探索。

This paper aimes at the problems in the course of Program Control Digital Switching technology , which is a backboned specialized basic course of the speciality of communication engineering in our university .

构建了一个基于数字语音交换技术的多方会议系统。

A multiuser conference system based on the digital audio exchange technology is constructed .

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。

The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks .

近年来，随着现代通信技术的迅速发展，数字程控交换技术也慢慢走向成熟。

In recent years , with the rapid development of modern communication technology , the program-controlled digital switching technology is also tending to be mature .

铁路时分数字程控交换设备技术规范

Technical code for SPC digital telephone switching engineering design of railway

虽然现代密码学中的对称密码体制、公钥密码体制、数字签名和密钥交换技术起到了保障安全的作用，但这些算法都将数据的安全性简单的归于一个规模很小的单一密钥。

Although modern cryptography provides symmetric-key block ciphers , public-key encryption , digital signature and key exchange technology to guarantee the information safety , all those algorithms ' safety only relies on a small scale key .