福建省宽带多媒体通信网集成方案

本文主要介绍福建省宽带多媒体通信网络拓扑结构和业务集成方案。宽带多媒体通信网包括ＡＤＳＬ接入网、ＡＴＭ宽带交换网,应用服务器。目前在福建省宽带多媒体通信网上承载的业务有视频点播和宽带ＷＥＢ浏览、１６９／１６３的传输和路由骨干,帧中继,交互式视频业务（如电视会议,远程医疗）等。     

ATM技术──B－ISDN的基础

ＡＴＭ技术──Ｂ－ＩＳＤＮ的基础谭淑贞编者按目前的通信网正逐步向宽带化、综合化和智能化方向发展。Ｂ－ＩＳＤＮ（宽带综合业务数字网）是未来通信网的发展方向，而ＡＴＭ（异步转移模式）是实现Ｂ－ＩＳＤＮ的基础。为了使广大读者对ＡＴＭ技术有一个基本的了解，本...     

有线与无线技术结合的接入网

通信市场目前正面临着急剧的变化，利用被称作接入网的有线和无线技术的用户接入设备也相应问世，富士通过在局用交换机ＦＥＴＥＸ－１５０及光接入网传输设备中采用了国际标准规格的Ｖ５接口，以推进网络的开放和灵活适应高度复杂化的通信网，另外，为迎接终将到来的多媒体时代，富士通的ＡＴＭ／ＶＯＤ等宽带业务用接入网系统的开发也正在进行。     

宽带综合业务接入网——数字化生活的基石

文章从通信网络的发展趋势出发,阐明了宽带接入网的发展方向和接入网目前常用的接入技术,论述了国内通信网尤其是接入网的宽带化和IP化的必然趋势及解决方案。     

一种基于ATM的宽带公众多媒体通信网介绍

初期建设的公众多媒体通信网通常为窄带的业务网,网络各节点之间一般是通过路由器采用２Ｍｂｉｔ／ｓ数字专线进行连接。目前,公众多媒体通信网已逐步向宽带化方向发展。根据技术发展趋势,宽带网宜引入ＡＴＭ技术,为窄带和宽带的信息提供综合统一的传送平台。介绍了一种基于ＡＴＭ的宽带公众多媒体通信网方案及其网络组成、设备配置和网络特点。     

光接入网的现状与未来

光接入网是接入网的战略发展方向，本文首先介绍光接入网的系统配置和应用类型，然后介绍３种宽带业务的传送方案，以及交换式数字图象业务和应用；最后论述ＳＤＨ和ＡＴＭ在接入网中的应用。     

浅谈宽带接入网技术及其发展

1　引言接入网 (ＡＮ)是国际电联 (ＩＴＵ)近来提出的一个新概念 ,它包含用户传输系统、复用设备、数字交叉连接设备和用户 /网络接口设备 ,是整个通信网 (传送网、交换网、接入网 )的一个组成部分。信息高速公路、Ｂ -ＩＳＤＮ等宽带通信技术的发展和成熟 ,使得电信网、广电网和计算机网向统一的界面发展。现阶段出现的高速大容量的同步数字ＳＤＨ光纤通信技术和日趋成熟的ＡＴＭ异步转移模式 ,解决了宽带综合通信网络所需的传输和交换问题 ,而用户接入网的性能已成为宽带通信的“瓶颈”。目前接入网的现状与主干信息网的大容量、高速、双…     

宽带无线接入系统WiMAX的应用与部署

近10年来，全球通信规模及用户规模发展最快的网络是蜂窝移动通信网和公众互联网，目前两个网络正在进行有效融合。现有2G移动通信网向具有高速数据承载能力的3G网络演进；宽带城域接入网向具有移动性无线接入演进，宽带化、无线化、IP化成为网络发展的方向。     

发展省内数据及多媒体通信网的策略

湖北省已开通运行的数据及多媒体通信网有：分组交换网、数字数据网、ＣＨＩＮＡＮＥＴ及中国公众多媒体通信网等。ＣＨＩＮＡＮＥＴ及中国公众多媒体网无疑是今后发展的重点，湖北省宽带多媒体通信网将基于ＡＴＭ技术，以便与国家骨干网相衔接。在向宽带多媒体通信网的过渡中，经济发达的地市应结合ＡＴＭ进行网络改造，而其他城市则在保持路由器结构的基础上引入服务等级或采用高速战役上器方案。     

WiMAX技术发展与应用分析

1．引言 当前，接入网已经成为通信网宽带化的最后瓶颈，接入网的宽带化已成为接入网发展的必然趋势。宽带无线接入技术以其建网速度快、建设成本低、传输速度快、覆盖面积广、频谱效率高等特点，逐渐成为运营商新的选择。     

IP/ATM integrated services over broadband access coppertechnologies

A rich set of broadband access copper technologies is available in the market today, and more are coming out of the laboratories, rapidly moving to standardization. The most likely future scenario will be one where many different technologies coexist. This multi-access-technology paradigm poses an interesting internetworking problem where interoperability and capability to support today's and future user services play a major role in the design of a network architecture. This article begins with an overview of current and new xDSL access technologies to continue describing an access network design that harmonizes the interconnection between PON, xDSL, and native ATM transport technologies. The use of ATM technology for the interface to the broadband access and transport networks is then presented and justified. The article continues studying the protocol architectures proposed for access to network service providers, considered a driver application for broadband access deployment. Finally, different protocol architectures that can provide integrated services support at the user equipment are analyzed     

SingAREN: the Singapore Advanced Research and Education Network

Singapore is the first country in the world to have a nationwide broadband network infrastructure deployed. What started as an experimental ATM testbed network in 1995 has now become a nationwide broadband infrastructure called Singapore ONE, launched in 1997 to provide residential broadband access via ADSL or CATV cable modem technologies, and business access via ATM. As of June 1998, Singapore ONE supported more than 10,000 users with over 120 commercial applications. More than 100,000 users are projected by the end of 1999, increasing to 400,000 by the year 2001. In order to support the technological needs of broadband communications under Singapore ONE, and to address the national R&D agenda in this area, an advanced research network called the Singapore Advanced Research and Education Network (SingAREN) was established in late 1997. This article gives an overview of the broadband infrastructure initiatives in Singapore, focusing on the SingAREN project. The goals of SingAREN, its network configuration, the research programs and activities to date, and plans for the future are described     

The ATM layer chip: an ASIC for B-ISDN applications

The authors describe the architecture of an experimental research prototype application specific integrated circuit (ASIC) designed to serve as a generic building block of the future broadband integrated services digital network (B-ISDN). The chip performs common asynchronous transfer mode (ATM) layer functions such as cell assembly and cell disassembly. A new media access control (MAC) protocol developed for a broadband customer premises network is also integrated in the chip. The chip interfaces to the B-ISDN through a synchronous optical network (SONET) synchronous transmission signal-3c (STS-3c) framer chip. The ATM layer chip has been designed using 1.2 μm CMOS technology with a die area of 5.4×5.4 mm² and approximately 27000 transistors. Experimental results are described. At the user network interface, the chip can be used to implement broadband terminal adaptors and the network termination. At the broadband local exchange, the chip can be used in the implementation of ATM statistical multiplexers, ATM switch port controllers, etc     

接入网发展趋势和存在的问题

ＩＴＵ先后制定了ＡＮ接口建议Ｇ．９６４、Ｇ．９６５以及宽带接口建议Ｇ．９６７、１．４３２、Ｇ．９６６等。引人注目的接入技术有：铜线接入方面的ｘＤＳＬ、ＨＦＣ和非对称电缆调制解调器;光纤接入方面的Ｖ５接口技术、内置ＳＤＨ接入网、ＡＰＯＮ、ＳＤＶ等;无线本地环路以及宽带无线接入技术如ＬＭＤＳ、ＤＢＳ等。接入网的目标是建立全业务宽带接入网（ＦＳＮ）,最后文中指出了接入网建设中存在的问题。     

The Broadband Access Facility

The deployment of broadband access networks will revolutionise many aspects of society in the early years of the next millennium. Manufacturers, telecommunications providers and cable television operators world-wide are investing heavily on research into networks that provide broadband multimedia services to customers. BT has developed a prototype of a full service access network that can connect customers via optical fibre, digital subscriber line or radio technologies. This paper describes the physical implementation of the prototype network and the wide range of services that it can support.This prototype network, referred to as the 'broadband access facility' is enabling BT and its partners to understand the best access architectures for a given environment through practical testing. The network now serves as an experimental platform, that can be used for communicating broadband concepts, designing operational processes, developing management solutions and testing advanced applications.The full service access networks (FSAN) initiative is a collaboration involving fourteen of the world's leading telecommunications network operators and major equipment manufacturers. Its vision is to create a shared requirements specification for access systems supporting narrowband and broadband services. This common specification will mean that broadband network components can be developed for world markets, thus raising volumes and driving down unit costs. The common system specification is based around an ATM/SDH (asynchronous transfer mode/synchronous digital hierarchy) core network, with local optical fibre distribution via an ATM PON (passive optical network). DSL (digital subscriber line) systems maximise reuse of existing copper plant. The exact DSL system used depends upon where the optical system is terminated, e.g. in the local exchange, cabinet, kerb or home. Hence this broadband access system can support a range of access architectures — this flexibility is fundamental to the consensus achieved in FSAN.     

宽带多媒体业务的技术实现及其应用

本文根据宽带多媒体业务的业务特性，对ＡＴＭ网络，用户接入网，软硬件技术的业务提供能力进行了分析。     

胜利油田宽带接入网的建设

介绍了胜利油田宽带接入网的发展现状,并比较了两种接入方式的特点,结合胜利油田的实际情况提出利用ＡＴＭ ｏｖｅｒ ＡＤＳＬ方式建设宽带接入网。     

走近用户的ATM网

目前用户接入网广泛采用混合光纤／同轴网（ＨＦＣ）和非对称数字用户线（ＡＤＳＬ）技术,在此基础上建立ＡＴＭ网实现ＡＴＭ到家以适应未来宽带网的发展需要。基于ＨＦＣ网的ＡＴＭ网以ＡＴＭ节点交换、用户终端单元和头端单元设备来作支持。而在ＡＤＳＬ上完成ＡＴＭ交换业务时,则有两种方案可选：（１）通过在ＡＴＭ交换机与ＡＤＳＬ调制解调器之间加数字用户线接入复用器实现;（２）将离散多音频（ＤＭＴ）与ＡＴＭ相结合。     

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。     

Emerging wireless broadband networks

The rapid evolution of mobile wireless access networks toward multimedia support with QoS provision forces the development of advanced wireless broadband systems with high reliability and high data rate. To achieve this goal, new system design concepts with increased system capacity will be required. In that context, ATM is becoming a major infrastructure, receiving a lot of attention for telecommunication systems since ATM networks can most effectively support wireless access systems. Wireless ATM systems have low transmission cost, flexible functionality, mobile ATM protocol, and radio access layer protocols. This article overviews the various wireless broadband systems studied at 5, 19.37, 40, and 60 GHz by European Union funded projects within the ACTS program. Moreover, related standardization activities and network evolution are also addressed