浅谈传输平台设备常见故障处理与维护

综合信息传输平台系统是基于SDH的MSTP传输体制,集传输、交换和接入功能于一体,同时集成了类型丰富的通信接口,提供电话交换、以太网数据交换功能,利用光纤网络传输容量大的特点,灵活实现话音、数据、视频等业务的交换传输。本文主要论述传输平台系统设备的常见故障处理和维护。分析了传输系统设备常见故障的一般特点及故障排除的常用方法。     

电力程控交换中心软交换组网设计

近年来,我国的电力企业取得了卓有成效的发展成就,电力通信业务突破了传统程控语音通信等单一的业务模式,逐渐朝着网络融合方向发展.传统的程控交换技术仅能够提供语音通话服务,难以满足多样化综合业务需求,因此,必须探索新的能够实现对电话交换网管理的新型通信技术.此次研究将宽带IP技术作为基础,结合最新通信技术软交换系统,在信令控制及媒体处理技术支持下,构建了电力程控交换中心软交换组网系统平台,为企业生产及通信业务发展提供帮助.     

高速光纤综合通信网络平台研究

现代通信网络应能满足各种通信业务和通信容量日益发展的需求,实现话音、数据、视频、IP等业务的一体化综合交换和传输。在比较TDM、IP和ATM三种协议的基础上,提出"采用内置RPR和MPLS功能的MSTP平台"建设光纤综合通信网络平台的实现方法。MSTP采用SDH的数据帧结构,保持了SDH标准光接口、灵活分插低速信号、自愈环保护和功能强大的网管等优点,可对TDM、IP和ATM协议进行优化传输。     

ATM网络视频编码(分层)方法的探讨

ATM(异步转移模式)已被ITU确定为宽带综合业务数字网(B—IS-DN)的信息传输和交换模式.由于在B—ISDN中的一个重要业务是视频通信,所以有必要讨论在ATM网络中视频编码方案的新特点.文中首先概述了ATM网络中视频编码需解决的几个问题,并讨论了适用于ATM网络传输的分层编码技术,最后给出了一种分层编码的算法.     

华北油田综合接入网络改造探讨

华北石油通信网历经30年的发展建设,不仅通信业务由单一的语音业务发展到语音、数字数据、广播电视、工程技术服务四大业务板块,业务提供能力也实现了质的飞跃.目前,网络覆盖两省两市22个市县地区,建有通信光缆1 500 km,微波传输800 km,形成了以河北任丘华北石油基地为中心,光缆为主、微波为辅的网络架构,以此传输平台为依托,承载了程控交换、宽带、数据通信、有线电视、无线市话等多个业务网络.但是随着人们对通信服务的要求越来越高,以及受到技术、业务、市场发展的不断推动,人们不再满足于打电活和看电视,而是出现了众多新的双向交互式的宽带业务,比如Internet数据传输、电子邮件、影视点播、会议电视、家庭视频监控等.     

适应网络演进的综合交换平台

为了适应网络宽带化、分组化的发展趋势,ＩＳＴＮ中的数字程控交换要逐步演进为包含ＡＴＭ交换和ＩＰ功能的综合业务交换平台。ＡＴＭ交换的综合可有组合、集成与宽带交换模块等方式;ＩＰ的综合视需要可包括ＩＰ接入、ＩＰ选路、ＶｏＩＰ甚至ＭＰＬＳ等功能。综合交换平台将在网络的演进中发挥重要的作用。     

VCON MXM铺路IP视频应用

通过IP传输视频的真正价值在于可大大扩充和提高企业范围内通信的能力,显著降低电视会议的成本,同时随着可接入范围的不断扩展,IP网络传输视频将为企业带来无穷的商机。 VCON公司作为综合网络化可视系统的领导者,为解决管理大量的视频终端、确保服务质量(QoS)、管理带宽需求以及网络集成和利用的问题,推出了媒体交换管理系统(Media Exchange     

民族通信产业之窗

国内高校首家现代通信综合实验网启动北方交通大学和深圳市中兴通讯股份有限公司将共建“现代通信教学科研综合实验网” ,这是国内高校中首家通信综合实验网。该实验网是现代通信网的一个缩影 ,集成了现代通信网的各种先进设备和技术 ,包括无线交换平台、智能网络平台、宽带交换平台、传输系统和业务接入系统 ,涉及了ＧＳＭ网、ＡＴＭ、智能网、ＩＰ、ＰＨＳ、ＷＬＬ、ＡＤＳＬ、ＤＷＤＭ、光纤接入网等先进的通信技术。实验网具有通信网、计算机网、广播电视网三网功能 ,可在多个实验室或教室灵活介入 ,进行远程监控、办公自动化、多媒体教…     

浅谈水电站集控中心通信系统建设

根据水电站集控中心语音、数据及图像业务的传输需求进行分析,就光纤数字传输系统、程控数字交换系统、数据图像传输系统、卫星数据通信系统、调度通信系统接入及通信电源系统六部分重点论述了集控中心通信系统的建设过程并对存在的问题进行了探讨。     

全球移动通信发展方兴未艾

一百多年前发明的电话是通信史上的一场革命,使人们实现了远距离对话的梦想。今天,移动通信的飞速发展可以说是一场新的革命。移动通信与计算机结合,已成为集无线、有线传输、数字程控交换和各类新型终端为一体的高效能综合通信手段。移动通信使人们能更加自由的通信,最终实现全球个人通信的理想。 目前的移动通信包括寻呼业务、     

铁路客运专线数据通信网的设计

铁路客运专线通信系统除了提供语音、数据、图像等多媒体的通信手段外,作为通信统一平台,还为列车控制、信息系统、运营调度系统提供不同层次、不同需求的数据通信网络服务。因此需要构建一个支持数据、语音和图像业务交换的多业务传输平台（MSTP）。针对铁路客运专线给出数据通信网的构建方式,文章对三种网络设计方案进行比较,指出各自的可行性。     

Digital video coding standards and their role in videocommunications

The efficient digital representation of image and video signals has been subject of considerable research over the past 20 years. With the growing availability of digital transmission links, progress in signal processing, VLSI technology and image compression research, visual communications has become more feasible than ever. Digital video coding technology has developed into a mature field and a diversity of products has been developed-targeted for a wide range of emerging applications, such as video on demand, digital TV/HDTV broadcasting, and multimedia image/video database services. With the increased commercial interest in video communications the need for international image and video coding standards arose. Standardization of video coding algorithms holds the promise of large markets for video communication equipment. Interoperability of implementations from different vendors enables the consumer to access video from a wider range of services and VLSI implementations of coding algorithms conforming to international standards can be manufactured at considerably reduced costs. The purpose of this paper is to provide an overview of today's image and video coding standards and their role in video communications. The different coding algorithms developed for each standard are reviewed and the commonalities between the standards are discussed     

电力通信MSTP网络规划研究

针对电力通信MSTP网络现状,依据电力传输网承载业务的变化,兼顾考虑网络容灾需求,提出电力通信MSTP传输网规划原则,构建电力通信MSTP网络目标架构,为电力通信发展提供必要的技术支撑。     

An Experiment in Integrated Digital Satellite Communications

The experiment we conducted for integrated digital satellite communications is aimed at realizing integrated services digital networks by satellite communication. The experiment was carried out in 1980 using the Japanese experimental communication satellite "CS." This experiment uses 30/20 GHz small earth stations and demand-assignment time-division multiple-access (TDMA) systems. Communications between customer terminals, which contain video conferencing, high-speed facsimile communication, high-speed computer communication, and packet-switching signal transmission, were carried out through the experimental digital satellite link. This paper describes the configuration of the experimental integrated digital satellite communications system and the experimental results of communications between customer terminals.     

Applications of voice processing to telecommunications

The ways in which people communicate are changing rapidly. The options are many and diverse, ranging from voice calls over wireless networks, to video calls over the conventional wired network, ISDN video, FAX, e-mail, voice mail, beeper services, data services, audio teleconferencing, video teleconferencing, and so-called scribble phone service (transmission of arbitrary handwritten input). This revolution in communications is being fueled by several sources, including the availability of low-cost, low-power, computation in both DSP and RISC chips, larger and cheaper memory chips, improved algorithms for communications (e.g., modems, signaling) and signal processing, and finally the creation of world-wide standards for transmission, signal compression, and communication protocols. The broad goal of the communications revolution is to provide seamless and high-quality communications between people (or groups of people), anywhere, anytime, and at a reasonable price. Although there are many technologies that form the bases for the communications environment of the twenty-first century, one of the key technologies for making the vision a reality is voice processing. In this paper we attempt to show, by example, how voice processing has been applied to specific problems in telecommunications, and how it will grow to become an even more essential component of the communications systems of the twenty-first century     

PTN、MSTP网络承载以太网专线的性能对比分析

随着通信网络IP化趋势发展,PTN、MSTP技术在以太网业务的传输承载上得到了广泛应用。通过理论及现网测试两个方面对PTN、MSTP技术承载以太网专线业务的效率进行分析,总结得出PTN承载以太网业务时网络吞吐率的配置建议。     

Very high speed and high capacity packet switching for broadbandISDN

The authors discuss and propose a very-high-speed and high-capacity packet-switching (HPS) architecture for a future broadband ISDN (integrated-services digital network). The HPS network accommodates various communication services, such as voice, high-speed data, high-speed still picture, and video services. The proposed architecture has three significant principles: a high-speed oriented simple network protocol, separation of signaling and network control from data transfer, and hardware switching. These principles provide fast- and high-throughput transmission for data packets and reliable transmission and processing for call-control packets. The HPS protocol structure is addressed, which provides high flexibility for various communications services as well as high-speed capability. A 3-Gb/s capacity and building-block-structured packet-switching system architecture, using bus- and loop-type switch fabric, is also presented     

基于小波变换的极低码率视频编码技术

介绍几种基于小波的极低码率视频编码及其应用，在世纪之替之际出现了许多新颖和特殊需求的应用领域，例如会议电视，移动通信中的视频传输等等。这些应用的出现，为极低码率的视频编码研究重新注入了新的动力。     

城域传送网设备技术发展及要求

本文通过对城域传送网设备的技术分析,阐述了SDH设备、第一代MSTP设备、第二代MSTP设备在技术上的缺陷,描述了目前工程建设中城域传送网对MSTP设备的SDH功能要求和以太网功能要求,特别是对以太网封装、虚级联、链路容量调整、内嵌式RPR、内嵌式MPLS的技术要求.