电话网的可靠性现状

随着国民经济和科学技术的迅速发展,电话网的业务范围正逐步扩大,人们不仅迫切要求电话网具有良好的技术性能,而且希望它能达到高可靠、长寿命。电话网的可靠性可以这样定义:电话网在规定条件下和规定时间内完成规定功能的能力,即称为电话网的可靠性。衡量可靠性的指标有:可靠度、故障率、平均寿命、维修度、失效率、有效度等。而评价通信网可靠性的尺度通常用失效率这个指标。所谓失效率,即使用系统和装置时不能得到正常机能的概率。当然也可用可靠度和维修度两个指标来衡量、评价电话网的可靠性。     

本地网中边界局的设置及其拨号选路方式分析

本地网中边界局的设置及其拨号选路方式分析邮电部电信传输研究所李少英我国公用电话网由长途网和本地网两大部分组成。本地电话网是以大、中、小城市或县城为中心，包含它们周围所属的县及郊区、农村地区在内组成的等位编号的电话网。这些本地网按地理位置分布，各个互相...     

徐州地区丰县、沛县本地电话网改造方案简介

介绍了徐州地区本地网现状以及在丰县、沛县本地电话网改造与建设中采取的具体方案和措施，并探讨了在本地网组网、建设中应注意的一些问题。     

广州本地电话组网及优化设想

组网结构对电话网的可用性和安全性产生直接影响。介绍了电话网的组网方式和广州本地网的组网。随着业务的发展，广州本地网应改变原有的组网结构，提高网络性能和有效利用率，最大限度地增加网络的可用性。     

试谈本地网传输系统的规划和建设与SDH的采用

简介了以Ｃ３为基础的本地电话网传输系统的星形网络和现有网络的不足之处，并说明传输系统的规划和建设是实现本地电话网的核心；指出了准同步数字系列（ＰＤＨ）的弱点和同步数字系列能满足的性能，以及ＳＤＨ设备（交换、传输和接入设备）的现状；阐述了本地网的规划应考虑采用ＳＤＨ，以及采用ＳＤＨ构成本地网的几种形式。     

数字通信技术讲座 第二讲 电话网的网路结构

本讲主要介绍电话网的等级结构、长途网及其结构演变和本地网的结构。一、电话网的等级结构 就整个国家范围内的电话网而言，很多国家都采用等级结构，就是把全网的交换机划分成若干个等级，低等级的交换局与管辖它的高等级交换局相连，形成多级汇接辐射网即星形网；而高等级的交换局间则直接相连，形成网形网。所以，等级结构的电话网一般是复合型网。 等级结构的级数选择与很多因素有关，主要有两个：一是全网的服务质量，例如接通率、接续时延、传输质量、可靠性等；二是全网的经济性，即网的总费用问题。另外还应考虑国家占地面积大小、…     

浅论我国本地网组建方法

通过对目前我国以地级市（或地级市以上）城市为中心组建本地电话网的利弊分析,和对我国本地网的发展进程的分析,提出近期不应对我国本地电话网规模做大的调整,但可在有关部门的统一管理下,统一有序地对少数小规模本地网进行适当调整的结论。     

江苏省C3本地电话网组网方式探讨

本文结合江苏Ｃ４本地网的实际情况，说明Ｃ４本地网纳入Ｃ３本地电话网的必要性，例举了４种Ｃ３本地网的组网方式。     

基于熵权灰色关联模型的移动数据业务综合绩效评价算法

在建立了移动数据业务评价指标体系的基础上,引入熵权法和灰色关联分析相结合的综合评价模型。熵权法是一种客观赋权方法,相对那些主观赋值法,精度更高。而灰色关联分析法对定性信息进行量化处理,减少了主观因素的影响。二者相结合充分利用了各指标的所有信息,提高了评价结论的准确性,最后通过实例验证了该模型的有效性和适用性。     

安徽省C3本地网的规划与建设

本文简述了我国电话网结构的发展趋势，并结合安徽省的情况，论述了Ｃ３本地网的规划建设和并网升位中的主要技术问题，并介绍了本地网的运行维护。     

未来全IP移动通信网中的微移动性管理研究

随着IP技术的普及和移动通信技术的迅猛发展,两者的结合与融合之势不可避免.本文通过对未来全IP移动通信中三种移动性支持的介绍,特别是对微移动性实现方案的分析,提出了一种基于MPLS的微移动性解决方案,改善了微移动性支持要求的QoS、可靠性和可升级性.     

智能蚂蚁算法及其在电信网动态路由优化中的应用

本文介绍一种新的、启发式的、具有自组织能力的智能蚂蚁算法；并针对我国电信网的具体情况，提出借助这种智能蚂蚁算法，用分散控制的方式实现电信网动态路由优化的一种方案，目的是提高网络资源的利用率，网络运行的效率和可靠性。     

Future trends in digital telecommunication transmission networks

New technology is needed by digital transmission networks for the increased bandwidth, performance and reliability requirements of existing and future telecommunication services, such as broadband ISDN. Increased flexibility, automation and control are also major issues being addressed. The combination of these factors has led to the development of synchronous digital hierarchy (SDH) networks to replace existing asynchronous networks during the 1990s. These issues are reviewed and further developments to bandwidth-transparent optical networks indicated for the twenty-first century     

A software tool to support the reliability design and evaluation oftelecommunication networks

Highly reliable telecommunication networks require new technologies, such as the reliability specification, design, and evaluation method used at NTT. This paper describes the basic concepts of this method, and the ARDES-NET (Availability Reliability Design and Evaluation System for NETworks) software tool is used to support the reliability design and evaluation. ARDESNET has a user-friendly interface and can be easily put into practice     

Routing design of tree‐shaped local public communication networks with high reliability and low cost

This paper discusses reliability problems for local public communication networks such as cable television networks and the subscriber‐loops of telecommunication networks. They have tree‐shapes and expand continuously as new customers join. By introducing a simple model, it is shown that most principal reliability measures and cost measures for such networks can be described through the networks' graphical characteristic quantities. Extensive simulations show that the prior provision of trunk pipes and a suitable choice of the route selecting rule for new customers are effective in constructing a highly reliable network with low cost. This revised version was published online in June 2006 with corrections to the Cover Date.     

基于单向CATV网不间断电源的远程监控系统

介绍两种典型的有线电视网不间断电源（ＵＰＳ）的远程监控系统的实现方案,设计实现了一种基于单向ＣＡＴＶ网络ＵＰＳ的远程监控通信系统,这种监控系统利用公用电话网（ＰＳＴＮ）传输ＵＰＳ信息,这样通过监控中心计算机可实现对整个ＣＡＴＶ网络中ＵＰＳ的网络化管理,从而提高网络供电质量,确保ＣＡＴＶ信号传输的可靠性。     

关于我国通信网可靠性的研究

通信网的可靠性是一个很复杂的问题，本文通信对通信网可靠性的特点和影响因素等问题的描述，以及对通信网可靠性分析方法和实施措施的介绍，说明可靠性的分析是一个困难问题，而可靠性的实施是一个经济性问题。     

Réseaux à large bande intégrant les services de télécommunication *

With the important breakthrough of optical fibre techniques over the past few years, a new type of broadband networks is emerging offering a wide range of services, including existing telecommunication services. The French telecommunication administration installs presently a first generation of broadband networks using optical fibres and broadband switchings, the so-called vidéocommunication networks. When specifying these networks, one important aspect was to assure that these networks can also offer telecommunication services and can evolve in a way to become the basis of a future national telecommunication network. The paper describes the approach adopted for the interconnection of these vidéocommunication networks with existing or planned telecommunication networks.     

Evaluating Reliability of Telecommunications Networks Using Traffic Path Information

We propose a reliability model for representing telecommunications networks that does not focus on topological information, but rather traffic path information. Mapping from traffic paths to physical elements and capacities enables the model to express simply how terrible performance degradations occur. Existing models, such as probability graph models, and probability-capacity graph models, do not adequately address actual telecommunication network designs. The probability graph model never considers performance degradations, while the probability-capacity model unreasonably assumes that we can estimate performance degradations from only the network topology. This paper also proposes an algorithm for evaluating the reliability of our new model. A numerical example shows that the algorithm is reasonably efficient for even large telecommunications networks.     

Intelligent optical networking for multilayer survivability

In recent years, telecommunication networks have faced explosive (IP) traffic growth. As traffic keeps growing, network reliability gains more and more importance. This article investigates to which extent switched connections and fast connection provisioning, typical for intelligent optical networks (IONs), can be used to provide resilience in an IP-over-optical multilayer network scenario. This solution, based on transport network flexibility, is compared with more traditional static multilayer resilience schemes in terms of cost (capacity) requirements and operational (dis)advantages