共查询到18条相似文献,搜索用时 78 毫秒
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近年来,宽带综合业务数字网(BISDN)的研究非常活跃。宽带交换技术是BISDN中的关键技术之一,而其中的难点是宽带交换矩阵。过去,已有许多宽带交换矩阵的设计,例如Banyan网络等。但这些矩阵都有不足之处。本文提出一种自选路由、无堵塞、高速、大容量矩阵开关的拓扑结构和控制算法,并对硬件电路的实现进行了考虑。这个矩阵能够实现1对1、1对N、N对1、N对N的连接,并且具有控制算法简单、能够检测故障、对称性好、易集成等优点。 相似文献
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未来通信网的变革将对程控交换提出重大挑战。本文简要介绍向宽带化,智能化,个人化发展的通信网对程控交换技术和交换系统的影响和要求。 相似文献
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B-ISDN的交换技术必须是宽带交换技术,光ATM交换是在光交换和电ATM交换基础上形成的一种新的交换技术,它以简洁的系统结构,相对低的系统及用户终端成本、灵活的网络功能,实现数+Gbit/s甚至数百Gbit/s的各种信号码率的全透明交换 相似文献
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在电路交换、分组交换和ATM交换的基础上,研究了一种新的交换技术——动态同步传输模式(DTM)。DTM是基于电路交换的宽带网络技术,这种技术可以动态地分配时隙。DTM将IP业务与电路交换下的语音通信融合起来,提供基于多播多速率信道的服务,可以充分利用光纤容量,大大提高现有电路交换系统的性能和效益。 相似文献
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本文综述了视频点播的发展与试验情况,介绍了基本网络结构,分析了实现视频点播的关键技术,包括宽带交换技术,接入技术,视频服务器和用户终端等。 相似文献
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光纤传输技术和光网络技术的发展使得光网络成为现代高速宽带网络的基础骨干网。文章论述了三种光交换技术,并详细分析了光突发交换网络技术原理、交换结构及相关网络协议。在目前光器件和光信息处理方式未取得重大突破之时,光突发交换技术集成光电路交换和光分组交换的优势并且实现方式可行,能满足现有大容量、高速率的多媒体信息交换与传输,将成为下一代光IP骨干网的核心技术。 相似文献
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本文论述了宽带交换机里的关键部件——宽带交换网络的基本原理,着重讨论了在使用中规模高速集成电路设计宽带交换矩阵的过程中应注意的一些问题,并力图给出了基本的解决方法。本设计方案的指导思想之一是全部采用国内组件,这无疑对宽带网的国产化有着极重要的意义。 相似文献
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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。 相似文献
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Although the enhancement of System 12, SEL's digital switching system, for ISDN services is virtually complete, further development work is being carried out to allow broadband switching for videophone services, videoconferencing, and the distribution of radio and television programs. This paper describes an appropriate approach to the evolution Of System 12 toward the broadband ISDN (B-ISDN), emphasizing the crosspoint and technology aspects of the broadband switch. Test results on a broadband switch VLSI circuit for 140 Mbit/s in a 2μm CMOS technology are presented. 相似文献
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Two forces, service needs and technological advances, are driving the extension of the Integrated Services Digital Network (ISDN) into the broadband area. First, this paper identifies several business and residential services which provide a market pull for broadband ISDN (BISDN). Secondly, it reviews recent advances in optical transmission and broadband switching which provide a technological push. Finally, it describes an experimental broadband prototype constructed to help us better understand the transmission, switching, signaling protocol, software, and service capabilities required for BISDN. 相似文献
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Tayeb Ben Meriem 《电信纪事》1990,45(9-10):555-576
This paper first reviews how switching evolves in the ISDN environment with emphasize placed on changes in conventionnal time-division switches, then assesses techniques and technologies usable in optical switching and broadband networks : optical space-division switching systems (architecture, technologies based on dielectrics, semiconductors, photorepactive material) and optical time-division switching (optical memories based on delay lines and on bistable components multiplexing); multiple access networks (tdma, multiple access by code) ; switching using spread spectrum (bit switching); wavelength switching (multiplexer-demultiplexer, tunable laser and filters) ; packet switching in multi-wavelength networks (broadband networks standardization, local area networks with bus, passive star or multi-star configuration). 相似文献
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A broadband 64×16 space-switching approach and its applicability to large-scale broadband switching systems are described. The design uses a technique that prevents the parasitic capacitances from reducing the switching speed. The switching system was implemented in 3-μm CMOS VLSI and operated in excess of 150 Mb/s. Computer simulation indicates a 1-Gb/s potential with a 1-μm CMOS implementation 相似文献
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A nomenclature describing a set of essential dimensions or characteristics germane to integrated broadband switching architectures is presented. Using this vocabulary, a classification of switching architectures is proposed. The classification is intended to afford the switch designer an ordered and reasoned approach to deciding among the numerous choices in the design of broadband switches 相似文献