The Satellite System as an Integrated Telecommunications Switching Center

Telecommunication satellites were first used as a means for establishing alternative transoceanic routes in competition with existing submarine cables. The use of advanced techniques in conjunction with the multitime-zone coverage makes it possible for transoceanic satellite systems to compete favorably with conventional intercontinental transmission means. This paper concerns itself with methods for economically applying satellite techniques to European conditions in competition with a finely meshed land-based relatively cheap coaxial cable system. Under these conditions every effort must be made to obtain the highest possible efficiency. The national gateways to the international telecommunication network are to see the satellite system as an equivalent trafficcarrying means capable of handling 30-70 percent of the total interEuropean traffic. It is therefore necessary to regard the satellite system, consisting of earth stations and satellite, as if it were a supranational switching center for international traffic. An essential ingredient in such a solution is a system global control. This global control is proposed to be implemented by computer means intercorrelated by means of common signaling channel methods. Principles and means of implementation of the principles are outlined.     

TELBANK: a telecommunication network for banking system in Poland

A digital telecommunication network, TELBANK, developed and operated by a consortium of Polish banks is described. Four TELBANK subnetworks, i.e., TELBANK-M, TELBANK-T, TELBANK-P, and TELBANK-VSAT are presented. TELBANK-M is a subnetwork offering long-distance transmission channels. TELBANK-P and TELBANK-T are packet-switched and circuit-switched subnetworks, respectively. TELBANK-VSAT is a satellite communication network. Three examples of TELBANK use for connections to external services are also presented     

Completing the convergence puzzle: a survey and a roadmap

Convergence has more than ever been a central issue for fixed and mobile operators throughout the world and is considered to be the next big step in the evolution of telecommunication networks. Convergence opens new market opportunities and competition among network operators and above all offers enhanced user experience. Multimode handsets and the proliferation of terminals and access technologies are generating increasing demands for solutions that enable convergence, seamless handover, and transparent service delivery across heterogeneous access networks. Different strategies are available for operators, depending on the services they intend to deliver to their customers, from basic commercial convergence limited to unified billing for Fixed/Mobile/Internet up to in-dept network convergence covering new applications and services. This article surveys different technologies which offer seamless handover and converged access to mobile voice, video, and data services. It provides first the different network parts involved in defining the operator global convergence strategy and then surveys different technologies which achieve this step-by-step convergence. We present the main features of these technologies and discuss their limitations and potentials to enable convergence in heterogeneous networks. We also provide a personal stance as to the emergence of these technologies and our vision towards the long term converged telecommunication networks.     

Global corporate networks in Japan

The status of global corporate networks introduced by Japanese companies in the 1980s and the trends in these networks in the 1990s are described. The main goals of the global corporate networks in the 1980s were twofold: obtaining convenient functions by making up for deficiencies in services offered by telecommunication service providers, and lowering communication costs. It is argued that the strategic importance of network systems to corporations is increasing and that construction of application-oriented global corporate networks will expand in the future. The operation, maintenance, and user base expansion of the global corporate networks are discussed     

The ITU's role in the restructuring revolution

The ITU recognizes a twofold mission: to monitor regulatory policy changes and technological developments to be in a position to advise members; and to link restructuring changes to overall basic telecommunication development needs. The fundamental goal of the international community in this sector is to achieve universal access to basic telecommunications services. In this context, restructuring is but one component, although the global challenge is to work together to ensure that the restructuring revolution paves the way to filling the development gap. It is readily admitted that new technologies such as mobile satellite systems enable developing countries to leapfrog their infrastructure problems, and that governments recognize the potential benefits of these new technologies and the need to reform regulations in order to facilitate the introduction of these services     

电信网络与IP网络融合的现状与观察

介绍了电信网络和ＩＰ网络融合的现状。一方面大力加强信息基础设施建设,营造高速宽带化网络环境,探索网络技术、网络业务的全员融合;另一方面在现有网络资源的基础上开发新业务,应用平稳过渡的渐进演变策略,逐步提供宽带多媒体通信业务。     

DVB-RCS前向信号检测与分析

宽带化,交互式应用成为通信服务的发展趋势,针对传统DVB-S系统在卫星宽带应用中的不足,BTSI制定了DVB-RCS标准,通过DVB-RCS系统构建卫星交互网络,满足了市场的需求.文章通过对DVB-RCS协议的分析,阐明了交互式网络的系统结构和信令的组成,分析了网络接入的流程以及在此过程中信令的作用,最后对DVB-RCS前向信号的检测和信令解析提出了可行的方法.     

对NGN的再思考

公共因特网的优点是分布、开放和自治性,使其能够在全球广泛普及、无处不在,而其基本服务免费、增值服务收费的模式符合以人为本的思想,代表未来发展方向.NGN强调考虑电信运营商的要求,需要建立全网的统一控制,将导致成为运营商的专网,从而失去因特网的基本优点.因特网生态系统的建立,性能的提高,开始能够提供可以和NGN竞争的业务,将挤压NGN的生存空间.NGN不应该将自己置身于无所不在、无所不能的下一代因特网之外.NGN应该扩大内涵,实现和NGI的融合统一,未来网络基础设施很可能仍然保持因特网分布自治的基本形态以具有无处不在的渗透能力,而同时并行存在具有目前NGN定义的集中控制QoS能力的专网,以满足特殊需求.     

浅谈VSAT卫星通信系统设计方法

本首先介绍了VSAT卫星通信技术的一般概念及特点，然后介绍了VSAT通信系统规划需要注意的事项，其次着重探讨VSAT卫星终端站的设计方法，特别对卫星终端站天线尺寸的选择和安装位置进行了详细的论述，并提出了一些卫星终端站设计中应遵守的原则，最后结合VSAT卫星通信的特点展望了其未来的应用前景。     

电信传输网的OAM及其发展目标

随着电信网业务量和业务种类的迅速增加,电信网络正变得越来越复杂,对网络的运行、管理和维护（ＯＡＭ）也提出了更高的要求。为此,电信传输网作为提供电信服务的基础设施,必须有效地加以管理和操作,为用户提供优质低价的电信服务。文章描述了在此情况下传输网通道层的ＯＡＭ及其发展。     

面向全球能源互联网的天空地协同卫星通信网络架构

全球能源互联网的监测、调度、授时、同步及定位等业务均需要能提供广域覆盖、泛在灵活接入服务的可靠通信网络。针对该需求,首先分析阐述全球能源互联背景下各种新型业务需求及其特点,并总结各种业务的共性数据特征;然后论述卫星通信技术的特点以及与全球能源互联网业务特点与数据传输需求的高度契合性,最终提出融合卫星通信网络的全球能源互联网天空地协同网络体系架构。其以IP技术为基础,各层网络通过星间、星地、星空、空空、空地以及地面有线、无线链路连接起来,构建全球覆盖的一体化网络体系。     

Advanced architecture for a one-chip 16×16 digital switch

A one-chip 16×16 digital switch (SWEL) is presented which is designed for use in a wide variety of applications, ranging from digital mobile radio and satellite applications, to PCM switching systems (integrated services digital network). It provides a compact, low-power solution to perform in channel-controlled switching of 64-kb/s or 2-Mb/s channels. Both architecture and design issues are discussed in detail; a 1.2 μm double metal CMOS technology was employed in the design. The multiplexed architecture allows for easy implementation of new application-specific requirements, making this circuit the cornerstone for new telecommunication switching products     

下一代互联网研究方向与趋势

"业务综合"和"网络融合"是通信界多年来努力的目标。IP网络具有承载包括语音、数据和视频等多种业务应用能力,这使业界将全IP网络看作是未来融合网络的雏形。但目前的IP网络无法保证实时业务的服务质量以及网络和业务的安全性。为了在下一代互联网发展方面处于领先地位,全球各国都在不断投入力量进行下一代互联网的研究工作。本文主要介绍IP网络和业务的发展情况、目前IP网络存在的问题以及全球在发展下一代互联网方面所做的努力。     

PTN＋GPON在煤矿业务中的应用研究

介绍了在煤矿密集地区,采用PTN＋GPON模式组建汇聚／接入层网络,实现了对煤矿企业多业务接入、收敛和调度。PTN＋GPON技术适合电信网IP化的发展趋势,满足了高QoS业务比例逐渐增加和带宽不断增长的需求,增强了运营商全业务运营的竞争力。     

Classification and Assessment of Telecommunication Services in Broad-Band Networks

Communication systems have become a fundamental utility for many facets of private and public life. Increasing system capabilities and advances in technology stimulate expectations of the public for new telecommunication services. Quite a variety of new services have been proposed which will have to be analyzed as to their utility, customer acceptance, and feasibility of implementation. In this paper an analytical approach is selected to assess these services by defining their communication structure and arranging them into classes corresponding to information flow, mode of information exchange, and communication pattern. Services requiring considerable technical expenditures and having a significant impact on future network configurations are pointed out. These services reqmre subscriber-individual and broad-band communication channels. For selected classes of services, a conceptual implementation in three types of networks is presented. It is recommended that several new services be implemented by using facilities of the existing public telecommunication network.     

电信管理网

阐述了TMN的概念、管理功能和管理业务其及体系结构,并介绍了以我国TMN技术和标准为基础的综合电信管理网的建设情况。认为传统的电信管理网络已不适应现代电信网的管理要求,而由国际电信联盟——电信部(ITU-T)提出的,具有标准协议、接口和结构的电信管理网(TMN)将成为未来电信网管理的基础。     

在电信网上开发CATV传输业务的建议

本文在概述ＣＡＴＶ传输网，电信与ＣＡＴＶ传输网的兼容性，国际ＣＡＴＶ与电信市场的竞争和国内ＣＡＴＶ网发展概况基础上，提出在电信网上开发ＣＡＴＶ传输业务的策略。     

NGN业务模型变化和电信变革

NGN(下一代网络)采用集中控制的统一的承载网提供综合业务,解决了QoS(服务质量)、安全性和可管理问题,但这种集中管理模式部分削弱和丧失了互联网无所不在的性能,不能有效地支持以P2P为代表的互联网新应用和机-机业务.此外,NGN按服务质量和使用量收费的业务模型,不适应目前消费类宽带业务的发展,以宽带接入包月为代表的互联网运营模式强烈冲击传统电信业务模式,动摇了NGN业务模型的基础.NGN需要并行发展具有分布管理能力的下一代互联网,利用互联网作为基层承载网,在其上应用层建立重叠网支持P2P应用和提供分布式管理,面向广大消费者提供固定和移动宽带互联网业务,支持机-机的各种应用,充分发挥互联网无所不在的优势.     

基于业务的电信网风险评估方法研究

为了加强对电信网的安全监管,保证电信网的安全运营,针对电信网的拓扑结构,在已有风险评估模型的基础上,提出一种新的定量与定性相结合的风险评估方法。该方法通过分析电信网中某一节点的各个业务的风险,得出被评估节点的风险,进而估算出整个电信系统所面临的总风险。该方法具有较好的可操作性和实用性。     

A brief history of mobile communication in Europe

Since the introduction of mobile telephony in the early 1950s in Europe, US and Japan the demand for this service exploded. It seems that the latent demand for mobile telecommunication services for decade’s continued to be very strong. After the introduction of cellular technology the capacity of the services became able to meet the massive demand. Next and future generations of mobile telecommunication technologies bring increased transmission speed and more versatile services. This forces network operators to organise multi sourced information flows supplied by service providers to increase the network effect of the system instead of providing the network infrastructure and leave the content to the users as in pure voice telephony. The drivers and inhibitors behind the emergence and recent developments of mobile telecommunications systems in Europe, are highlighted in this paper. Liberalisation of the telecom markets in Europe drove new entrants to the market and curbed excessive pricing. However, in recent years the lack of challenging service is the main cause for the wavering development of newer generations of mobile telecommunication services.