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光传输网对数据通信的支持 总被引:1,自引:0,他引:1
光通信自诞生之日起,其主要支持目标是以电路交换为基础的语音通信,发展至今,已经十分完善并达到相当高的水平。但在网中以分组交换为基础的数据通信信号的份量逐步超过电路交换信号的时候,光通信网络是否还能很好地承载这一类信号,光传输网如何支持数据通信,这是通信界一直在探讨的问题。本文就目前网络现状和技术条件下,对光传输网承载数据通信信号的主要技术进行讨论,说明光传输网对数据通信的支持能力。 相似文献
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光分组交换的关键技术 总被引:2,自引:0,他引:2
在电域内,有电路交换与分组交换之分,随着语音、数据、视频等通信业务正朝着综合的方向发展,数据流量逐渐超过话音流量。这就意味着面向连接的电路交换需要被升级到能支持数据业务的分组交换。分组交换保留电路交换传输时延小的优点,同时克服了线路利用率差的缺点。客观而言,在电域可望取得的进展在一段时间内能满足分组交换的需求,但是研究显示光开发技术的潜力能满足网络的长期需求。互联网快速增长是驱动光分组交换及网络快速发展的动力,得到WDM光传输基础设施的支持。电域TDM技术的增长系数是每年1.5,而每年的带宽需求增长系… 相似文献
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“中国高速互联网络(示范工程)”项目日前启动。前几年被认为是宽带综合数字业务网(B-ISDN)的基本技术SDH和ATM,目前受到了基于互联网络协议(IP协议)的宽带分组交换网络(宽带IP网)的强烈挑战。美国政府下一代因特网计划(NGI)和正在实施的第二代因特网计划,已经确定把宽带IP网作为基础。加拿大去年底也开始实施基于这一技术的全国先进光学网络计划CANE3。这一技术的特点是,基础传输网采用密集波分复用技术的全光网,基于IP协议的分组交换技术取代传统的电路交换技术。和目前的技术相比,它可以提供… 相似文献
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宽带实时网络业务的发展使得分组交换逐渐不能满足提供高服务质量(QoS)保证的要求,融合电路交换与分组交换以形成优势互补已成为网络技术发展的迫切需求。基于该需求,提出了融合电路交换与分组交换的基于TCP交换的新方法。以网络核心使用电路交换,提高核心带宽利用率;在网络边缘采用分组交换的技术,发挥其方便灵活组网模式。文章分析了TEP交换需要解决的主要问题,在此基础上较详细的讨论了,TCP交换中由IP路由协议创建与撤销电路链路的过程;分析了边界路由器与核心路由交换机所需完成的主要功能与任务;实现TCP交换所必须研究的关键技术。 相似文献
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5.4 ATM交换系统 ATM信元中承载的是宽带综合业务,因此信元交换应该是功能丰富、概念全新的一种交换技术。它应该像电路交换方式一样适用于电话业务,也应像分组交换方式一样适用于数据业务及其它业务。我们从改进分组交换、使其能满足实时性业务;或从改进电路交换、使其能满足灵活适配不同速率业务的两个不同角度出发,最终都发展到ATM交换。所以,ATM交换是电路交换与分组交换相结合的 相似文献
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作为电信运营网络的基础支撑网络,传送网络始终是为了满足所承载的业务需求并且优先于业务发展而发展的。以电路交叉链接为核心的SDH设备在近10年的黄金发展期里,覆盖了几乎整个电信的骨干核心层、汇聚层、接人层。后来,在IP业务的驱动下,MSTP设备得到了长足发展。但MSTP设备仍然是以电路交叉为核心的SDH设备,只是增加了一些数据业务的接口,可以实现数据业务的透明传输以及一些简单的业务汇聚。近几年,固网数据和3G业务不断发展,必然要求传输网络的IP化,即要求传送网络由电路交叉核心向分组交换核心的转换,利用分组交换核心实现分组业务的高效传送。 相似文献
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高速网络中的交换技术 总被引:3,自引:0,他引:3
一、引言 从传统的观点看,电路交换技术不适用于数据业务网络,而分组交换技术则是当今因特网技术的主流。但是随着光传输技术的发展,带宽已不再是网络的瓶颈。技术的进步使得原本分组交换的优势和电路交换的缺陷在当今已不再有意义,而且随着应用领域的扩大,原本处于优势的分组交换技术也暴露出越来越多的问题,而有些问题若使用电路交换技术则很容易解决。光交换技术的发展,更是为我们开辟了一个新的天地。本文讨论了在高速网络中传统交换技术存在的问题,介绍了高速网络中新兴的交换技术,分析了在高速交换中如何结合分组交换和电路… 相似文献
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本系列讲座系统介绍现代电信中主要交换技术的基本原理和特点。从技术发展的角度对逐项交换技术展开分析,并着重于不同交换技术之间的有机联系。考虑到知识的系统性本讲座将包括:电路交换、分组交换、帧中继、ATM交换、IP交换、标记交换、多协议标记交换(MPLS)、光交换等几个方面的内容。但是对于电路交换、分组交换等较成熟的技术只做概括性讲述,而对于ATM、IP交换、标记交换、MPLS、光交换等交换技术将给以较充分的讨论。 相似文献
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The telecommunications blueprint for a single Europe after 1992 is examined. This `green paper' is an ambitious three-year-old document in which the European Community's Commission calls for a Western-Europe-wide telecommunications infrastructure based on the integrated-services digital network (ISDN) and other digital communication links. The progress that has been made toward this goal is assessed, showing that progress toward opening national markets and establishing an infrastructure varies greatly from country to country. The highly variable quality of network services throughout Europe presents a further obstacle to unification. Nevertheless, the national segments of a trans-European ISDN system are beginning to emerge, and work on the specific technologies, standards, and regulations for cross-border telecommunications systems are advancing 相似文献
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《Spectrum, IEEE》1994,31(1):22-25
The author presents a technological overview of the telecommunications field covering the topics of: European telecommunication authorities privatisation; mobile communications in Asia; fibre optic amplifiers; and cable TV integration with wireless technology 相似文献
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《Spectrum, IEEE》1995,32(1):30-34
The author discusses advances and changes in: Internet; multichannel optical fibre networks using erbium-doped fibre amplifiers and wavelength division multiplexing; HDTV; digital radio; satellites for mobile voice telephony; the auction of wireless telephony licences; and unlicensed personal communication systems 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1977,65(9):1305-1313
Telecommunications controllers worldwide are becoming increasingly stored-program oriented. Electromechanical and electronic wired logic controllers lack the flexibility, maintainability, and (ultimately) the economy of stored program processors. While similar to commercial computers, most stored program telecommunications processors have features unique either in nature or degree of application. There also exists a remarkable variety of overall architectural features which are useful in telecommunications applications, and a similar variety of administrations and manufacturers willing to espouse them. Pertinent stored program processor architectural features are discussed as a dass, then extant and proposed processors are described and placed in perspective, Finally, likely future trends are discussed. 相似文献
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Numbering volatility in telecommunications is a by-product of progress from a monopoly telephone service to the multiservice, open market of the 1990s and the next century. The last twenty years have seen much number changing activity, including the London code change of 1990. A national code change is scheduled for 1995. The paper presents an understanding of these developments, and investigates personal numbering, branding, portability, and other issues which will be topical throughout the rest of the decade 相似文献
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The telecommunications in Indonesia is reviewed with emphasis on transmission and switching networks. It is recognized that due to the geographical configuration of Indonesia, problems are created in the field of telecommunication that require special transmission consideration. The existing Perumtel's Transmission Network and Domestic Satellite Project Palapa 1 are discussed. The future expansion programs in transmission and switching are also briefly reviewed. 相似文献
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According to Lithuania's Master Plan, further development of the country's telecommunications infrastructure must be concentrated on modern digital technology, most of it produced in Western countries. The Master Plan is divided into three parts. First, it is a short term plan that covers the development of telecommunication systems with high priority, and covers the period through the end of 1997. Another goal stated in the Master Plan is to have 48 main lines per 100 inhabitants by the year 2005. In addition, the Ministry decided to issue one license for operating a national paging network in 1995. This network must cover most of Lithuania. The number of licenses for local paging networks will not be limited 相似文献
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对澳大利亚电信业发展的历史及现状,包括无线通信、有线通信及计算机通信等方面进行了介绍,对该国电信业未来发展的前景作了展望。 相似文献