接入网向何处去?

本文首先介绍新形势对接入网宽带化和IP化的要求,然后重点讨论几种接入网技术的最新发展态势,主要有UADSL,VDSL,SDH,HFC,APONLMDS,EDSL和以太网技术,最后简要介绍我国接入网发展的现状和问题。     

接入网的发展及技术综述

本文介绍了接入网的基本概念，讨论了推动接入网快速发展的几个主要因素及Ｖ５接口对接入网的重要影响，并比较全面地评述了目前发展中的各项接入网技术。     

EPON--新一代宽带光接入网

由于以太网成熟的技术和广泛的应用,以太网无源光接入网(EpON)已经成为接入网技术中的最新发展态势.主要介绍了EPON系统的框架结构和一些关键技术.     

宽带网及ADSL接入技术

介绍了宽带网的概念、业务应用和发展形势以及宽带网的结构、主体网络和接入网可选择的技术,重点介绍了ADSL接入网的原理、结构和特点,并从总体上作了说明。     

面向21世纪的接入网技术

本首先介绍新形势对接入网宽带化和ＩＰ化的,然后重点讨论几种接入网技术的最新发展态势,主要有ＵＤＳＬ、ＶＤＳＬ、ＳＤＨ、ＨＦＣ、ＡＰＯＮ、ＬＭＤＳ、ＥＤＳＬ技术,最后简要介绍我国接入网发展的现状和问题。     

数字机顶盒及其在接入网中的一种应用模式

文章介绍了机顶盒 (STB)的发展状况和原理及其系统结构 ,说明了与宽带接入网的各种接口 ,并给出了一种与实际接入网ADSL(不对称数字用户线 )的应用配置模式     

SDH在中兴接入网中的应用

文章在介绍接入网概念和ＳＤＨ传输体制的基础上,提出接入网的分层方法,并以应用实例阐述了ＳＤＨ在中兴接入网中的应用。     

用户接入网发展浅析

集中介绍了目前用户接入网的提出及其组成和现状，结合本地实际具体阐述了用户接入网的技术发展及建设发展前景。     

关于发展融合型接入网的探讨

首先简单介绍了光纤接入网的发展历程,接着针对接入网宽带化、综合化的发展趋势．探讨了一种能够提供宽窄带综合业务和向NGN演进的融合型接入网。     

ADSL技术及其应用

介绍了ADSL宽带接入网技术和三种调制技术，最后阐述了ADSL在用户接入网中的一种应用并展示了ADSL的发展。     

Alternative local area network access protocols

The course of recent research is outlined, and state-of-the-art protocols are surveyed. The various classes of access protocols and corresponding performance models are covered. These are fixed assignment access, random-assignment access, demand assignment access, integrated local area networks, and multichannel local area networks     

Data rides high on high-speed remote access

Internet and remote access services are growing by leaps and bounds, and major efforts are currently underway to provide greater bandwidth to the user by a multitude of access technologies, both wired and wireless. This article discusses the key access technologies currently being developed by vendors and deployed by service providers. It is expected that xDSL, cable data networks, and fixed and mobile wireless networks will be the hotbeds of tough competition, while direct satellite networks will hover over them with the potential to completely change the way the access networks are built. Irrespective of the ongoing debate on which technology would win or loose, in the world of real networks different access solutions will coexist, finding their own niches to meet the varying demands of performance and cost objectives for the end user     

Architectural issues for robust optical access

Optical access networks are beginning to be deployed at the edge of the optical backbone network to support access by the high-end users that drive increased bandwidth demands. This development in the applications of optical networking poses new challenges in the areas of medium access, topology design, and network management. In particular, since optical access networks carry high volumes of critical traffic, the level of reliability and robustness traditionally reserved for core applications must be implemented in access networks. We survey access network architectures and outline the issues associated with providing reliability for these architectures. In the area of architecture design, two main approaches emerge. The first considers dedicated optical access networks, such as stars or folded buses, to implement optical access LANs and MANs. The second is overlay architectures, which use existing network infrastructure. Overlay architectures seek to replicate, on a smaller scale, logical topologies akin to those of backbone networks, or may instead create architectures specifically designed for access purposes     

浅谈宽带用户接入方式

提出了通信从窄带走向宽带后,电信网面临的新课题。认为需对原有电信网,特别是用户接入网进行改造,介绍了可用于改造的ＡＤＳＬ、光纤用户接人网、ＨＦＣ等用户接入方式     

Toward management systems for emerging hybrid fiber-coax accessnetworks

Advances in networking and hardware are motivating the development of high bandwidth local access networks that connect subscriber communities to the Information Superhighway. Hybrid fiber-coaxial (HFC) technology is emerging as one of the few economical viable technologies for designing new local access networks. These HFC local access networks are expected to support a variety of services in different spheres in an integrated manner, by drawing upon diverse technologies from the cable, computer, and telecommunications industries: the tree-and-branch network topology is typical of the cable network; intelligence in the end devices is a characteristic of the computer industry; and addressability, global interconnectivity, and quality of service (QoS) are characteristic of the telecommunications industry. It is this combination of diverse services and technologies that poses fundamental challenges in architecting a management system for HFC networks. The design of a management framework for HFC access networks is discussed     

我国宽带接入网发展阶段分析

本文根据我国接入网的现状和市场需求 ,提出了建设我国宽带接入网的三个发展阶段。     

Passive Optical Network Approach to Gigahertz-Clocked Multiuser Quantum Key Distribution

We present the application of quantum key distribution (QKD) technologies to fiber-based broad-band passive optical access networks. This application is based on our 850-nm wavelength gigahertz clock-rate single-receiver system, is compatible with existing telecommunications fiber and exploits a wavelength band not currently utilized in access networks. The developed QKD networks are capable of transmitting over distances consistent with the span of access links for metropolitan networks (10 km), at clock frequencies ranging up to 3 GHz     

异构无线网络垂直切换技术综述

垂直切换是多网融合的基础,是实现异构网络互通、支持不同接入方式无缝衔接的核心技术,目前正在受到业界的重点关注,并成为学术界研究的热点问题。随着无线移动通信技术向接入多元化、网络一体化和应用综合化的方向发展,各种蜂窝移动接入、宽带无线接入和固定接入将共同接入基于IP的统一核心网络,通过网络间的垂直切换,支持用户的移动性和移动过程中业务的连续性。首先给出了垂直切换的定义和基本概念,介绍了垂直切换的分类和基本流程,随后详细论述垂直切换的切换判决和切换执行2个环节。针对切换判决,总结了现有判决算法,重点评述各代表算法工作原理并剖析论其特点和存在的不足。针对切换执行,详述了现有垂直切换执行机制的工作原理和适用场景,并分析其优缺点。最后,对未来垂直切换技术的研究方向进行了展望。     

用户接入网技术和天津建设用户接入网方案的建议

对用户接入网技术和基本结构进行了讨论，并在此基础上对天津市用户接入网的建设方案提出了建议。     

Mobility support across hybrid IP-based wireless environment: review of concepts, solutions, and related issues

The 4G or Beyond 3G wireless networks is consist of IP-based heterogeneous access networks from 3G cellular, WiFi, WiMAX to other emerging access technologies such as mesh networks. The key objective of designing the next generation wireless networks is to support of mobile subscribers. To support the mobile host in the hybrid wireless access technologies, many solutions based on network protocol stack have been proposed in the literature. In this article, after review of mobility concepts, a special attention is given to some of the mobility management methods as well as handover techniques across various wireless access networks. We have also compared the major mobility protocols in each layer for their features. Finally, some of the open issues that needed to be addressed in mobility management protocol in the next generation wireless networks are outlined.