ICT的2012

2012年,电信业的转型已经到了需要认真思考的时候,是互联网融合进电信网,还是电信网融合进互联网？在全球各领域面临深层次变革的今天,电信业的发展充满挑战,也充满想象。     

Broadband communications: the commercial impact

The impact of broadband ISDN (integrated services digital network) is assessed. It is pointed out that the key step in its introduction, i.e. the replacement of the copper wire infrastructure by optical fiber, is already taking place. Two alternative routes for the introduction of broadband services are described: the market-driven route and the investment-led route. The market-driven route entails carriers responding to the demands currently being made of them. In the investment-led route, carriers lead the market and create demands by substantial investment in fiber residential networks. Carrier costs and rewards and anticipated market growth are examined. Broadband applications, the role of video communications, and the technology that will be used are briefly examined     

Techno-economic evaluation of narrowband and broadband accessnetwork alternatives and evolution scenario assessment

The paper presents the main results obtained within the Research in Advanced Communications in Europe (RACE) project: 2087 TITAN regarding minimum-risk introductory routes for new narrowband and broadband services in the residential and small business market. The project developed a methodology and a tool for techno-economic evaluation of advanced narrowband and broadband telecommunications networks and services. Results from four extensive access network studies are presented. For the narrowband services, optical access and radio in the local loop have been assessed and compared to conventional copper layout in a greenfield environment. Access network upgrade strategies for emerging new broadband services have been evaluated in three studies, with technological options ranging from enhanced copper to hybrid-fiber-coax (HFC) and broadband passive optical networks. An extensive study on different broadband access network upgrade alternatives for public network operators (PNOs) were carried out, taking into account the diversity of conditions met today by European countries. In another study, the effect of competition In the access network was modeled assuming two main operators sharing the market. Broadband upgrade alternatives were evaluated for a new cable operator, competing with the dominant public network operator. In addition, video-on-demand (VoD) and Internet access upgrades have been analyzed. The paper demonstrates the viability of techno-economic studies for the access network, including in-depth analysis of the time-dependence of component cost, tariffs, service penetrations and market shares     

光纤通信网技术的发展

本文综述公用通信网和专用通信网利用光纤传输的发展趋向。公用通信网将向数字化、综合化、宽带化、和智能化发展,最终成为B-ISDN。为此,通信网将从铜线过渡至光纤,从窄带过渡至宽带,从异步过渡至同步,从电路交换过渡至分组交换。全国传输网将是同步光纤网(Sonet),最后必然是“光纤到家”,从用户至用户的全程传输是光纤。另一方面,大企业、大机关急于实现自动化,各自建设专用的光纤局部区域网(LAN),从计算机通信进至综合业务。很可能专用ISDN比公用ISDN更早出现。住宅区需要通过光纤选收电视(CATV)。未来的公用市内用户网和专用局域网,将为光纤产业开辟最大市场。     

Risk analysis of residential broadband upgrade in a competitive andchanging market

The article presents risk and techno-economic analyses of broadband access network upgrade strategies for public network operators and cable operators in a competitive environment in the residential and small business market. The effect of uncertainties in predictions of critical parameters such as demand forecasts and market shares are analyzed. The assessed technology options include broadband twisted pair modem, hybrid fiber coax networks, and ATM-based passive optical networks     

光纤光栅在全光通信网中的应用

随着社会对通信业务需求的不断增加,基于DWDM的全光网络已成为未来光通信的发展趋势,光纤光栅具有附加损耗小,体积小,能与光纤很好地耦合,可与其他光纤器件融成一体等特性,这将使光纤光栅成为未来全光网中的基石,从目前的研究来看,光纤光栅已经能够为全光通信系统不光源,光放大,色散补偿,OTM（光终端复接器）,OTDM（光时分复用）,OXC（光交叉连接）等等关键部件提供优秀的解决方案。     

Optics: finding the best fit in telecom transport networks

This paper aims at looking beyond the gloomy current market evolution of the optical industry. Based on an analysis of the telecom transport market evolution (metropolitan as well as backbone), taking benefit of very significant technological breakthroughs in optics in recent years, this paper will suggest promising, yet pragmatic applications in telecom transport networks where optics will play a significant role beyond pure optical transmission.     

Field trials for fiber access in the EC

The European Economic Community's (EC) RACE program (Research and Development in Advanced Communications Technologies in Europe) started with a definition phase in 1986. The main effort of the first phase was aimed at customer access connections (CACs) and customer premises networks (CPNs), as well as identification of services that will use these high-speed networks. In the second phase, which began in 1992, RACE projects are focused on managing the high data rates generated by these networks and the need for high-capacity transport networks. The greater functionality required and the large number of multiuser applications operating simultaneously within and between organizations generates data rates, both intra- and intersite, on the order of tens of Gb/s. Such high data rates will spur the market for gigabit networks. At the start of the RACE program, some projects were devoted to integrating interactive and distributive services into one ATM-based electrical user network interface. The main motivation was the use of the same fiber for different services to the subscriber. The RACE projects demonstrate fiber-based broadband infrastructures for local access     

Broadband network evolution in Telecom Australia

The major forces viewed by the author as shaping broadband network evolution in Australia are examined. The discussion focuses on market influences, the role of video services, the expected level of penetration of broadband networks relative to narrowband networks, and the introduction of the optical fiber local loop. Network intelligence and control and the transmission infrastructure are considered. An overall network evolution scenario for the customer sectors expected to be the main users of broadband services is proposed     

FTTH的技术特征与方案选择

本文首先介绍宽带接入网的发展状况和主要应用,然后讲述宽带光纤接入网的主要优势,接下来详细分析了各种FTTH的技术特征与方案选择比较,着重指出各种FTTH技术都有其最佳使用场合和时机,其中点到点有源以太网光纤系统适合在低密度用户分散地区应用,点到多点无源光纤系统最适合新建或改建的密集用户区应用。我国的发展应跨越APON、BPON阶段,从宽带点到点以太网光纤系统和EPON开始,最终过渡到GPON阶段。     

Mobile ATM: state of the art and beyond

Conclusion In Fall 1998, the International Workshop on Mobile Multimedia Communications (MoMuC'98) will host a two-day workshop on mobile ATM testbeds. The event promises to bring together researchers, developers, and practitioners from industry and academia to discuss results from WATM testbeds and other experimental work in the field. Also, toward the end of 1998 the preliminary specifications for “mobile ATM” and the 5 GHz WATM radio access layer will appear. This will significantly speed the arrival of commercial broadband radio products an the market. The availability of such products will radically change the way we interact with multimedia content over next-generation mobile networks     

中国宽带应用产业发展趋势研究

宽带应用是指基于宽带互联网的增值服务。随着宽带接入的普及,宽带应用产业将成为互联网产业发展的主导和趋势。预计到2006年以后,宽带互动媒体将成为主流的宽带应用。宽带应用产业的总体发展趋势包括价值链复杂化、运营模式多样化、服务个性化与综合化。宽带应用产业的运营模式的变化趋势是商业模式细分化、收入模式多元化、营销模式传统化等。预计到2008年,宽带应用产业的市场规模将占整个宽带产业市场规模的一半。     

家庭固定宽带接入的克拉玛依共建模式探讨

家庭固定宽带接入具有明显的自然垄断性质,用户有选择运营商的权利。新疆克拉玛依市积极推进三网融合发展,所有的新建小区、老旧改造小区都要求采用三网融合的共建模式,运营商平等参与固定宽带接入建设,不但节约成本,还将营造有效的市场竞争环境。     

Demand for broadband access in Greece

As broadband access networks are relatively new in Greece, it is really difficult and involves great risk to determine the potential market for broadband services. The intent of this paper is to add to the discussion of delivering fixed broadband lines to customers in Greece taking into account regulation issues, the strategic movements of the market key players and the commonly admitted inequality of broadband access availability between urban and rural areas. In addition, using time-series analysis and examining the correlations between the number of fixed broadband lines and specific demographic factors for the past three years (mid 2006–mid 2009), an attempt to estimate empirically the forthcoming demand for broadband lines is conducted. Population’s income and effective competition are recognized as the strongest determinants of broadband development. In addition, it yields that demand for broadband will continue to have a positive trend for the years to come as people are becoming more and more familiar with new technologies, with youth being the pioneer to the use of innovative services that require broadband access.     

Optical networks research at UCL

New dynamic optical switching technologies and adaptive transmission techniques will allow increased capacity and flexibility in future core and metro networks. The Optical Networks Group at UCL has carried out research focused on these areas, in collaboration with industry and other university research groups, for over a decade. In this paper, the technical challenges to be overcome in implementing dynamic, high-capacity networks are discussed, and recent results of the group’s work are presented. New network architectures based on wavelength-routing and optical burst switching have been proposed and analysed, and the experimental demonstration of burst switching using fast wavelength-tunable lasers is described. High-capacity dense wavelength division multiplexed transmission systems, using advanced regeneration and equalisation techniques, have been studied, both theoretically, and experimentally using a dynamically reconfigurable recirculating fibre loop. Research results on advanced optical signal formats, all-optical 3R regeneration at 40 Gbit/s channel rates, adaptive analogue and digital electronic processing techniques and optical finite impulse response equalisation are presented. Finally, the development of optical performance monitoring technology, a key component of future all-optical networks, is described. The paper concludes with a prediction of future trends in optical communications research.     

关注下一代互联网

2012年6月6日,由CNGI专家委员会主办的＂下一代互联网发展建设峰会＂在京召开。国家发改委副主任张晓强、工业和信息化部副部长杨学山、教育部副部长杜占元、科技部副部长曹健林、中科院副院长阴和俊等出席会议并致辞。来自中国电信、中国移动、中国联通等业界的1000多位代表参会。当前,下一代互联网已成为我国战略新兴产业的重要组成部分。在国家颁布的《国民经济和社会发,     

Home systems standards: achievements and challenges

"Home systems" is a new consumer products industry. The market potential is very large, although the market has been evolving very tenuously. What is certain is that consumer demographics favor more conveniences for busy families and devices that assist those with physical limitations. Products based on home systems technology will serve both of these market segments. A variety of consortia and authorized standards bodies have been writing specifications for residential networks to provide a communications infrastructure for home systems and connections to external networks. This strategy of defining an infrastructure to support a nascent market is unusual. However, it offers the opportunity to specify a network without backward compatibility constraints, so often a requirement when upgrading and standardizing existing networks. This article addresses the fundamental question: has the home systems industry been successful in writing and adopting standards that promote industry growth? In part, the emergence of the home systems industry is a work in progress. Nevertheless, important standards and consortia programs have been developed since the mid-1980s. Some of the prominent achievements in home networks are reviewed. This article concludes that a clean slate offered by an undeveloped market is an advantage to standards writers. However, there needs to be a strong impetus to enter a potentially thriving market in order to motivate the standards writers to target and complete their work expeditiously. Otherwise, the writers will invest too much time perfecting their work, rather than making pragmatic compromises     

Evolution scenarios for optical telecommunication networks usingmultiwavelength transmission

The authors discuss how the transition in telecommunication networks taking place with increasing use of fiber in all segments of the networks, together with the increasing demand for broadband services, will lead to new network architectures. The customer access portion of these networks may have a large geographical range and high functionality, and may encompass switching functions. The increased use of optical routing based on wavelength multiplexing is likely to be employed in both the core and access portions of the new architectures. Among others, these developments will mean that fewer conventional crosspoint switches are required to support future broadband networks     

Optical network testbed-key enabler in developing current and future network solutions

The all-optical network (AON) demonstrator is a trial system-level testbed for the validation and verification of key network building blocks, scalable architectures, as well as control and management solutions for next-generation wavelength division multiplexing (WDM) networks. Developed at the Communications Research Centre (CRC) in Ottawa, ON, Canada, the AON testbed has already validated certain system-level concepts at the physical and upper layers. The paper describes the crucial role of the AON testbed in research, development, and "proof of concept" for both emerging optical technologies at the physical layer (performance characterization) and customer-managed networks at the upper layer (network management). Moreover, it is expected that the AON testbed will continue to be a valuable playground for future developments of emerging technologies, solutions, and applications.     

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.