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B-ISDN作为一种新的网络,它采用异步转移模式(ATM)作为信息传送方式,以光纤传输作为B-ISDN的基础。ATM为所有的业务都提供了一个灵活的传输性能。ATM适配层(AAL)是用来增强由ATM提供的服务,以支持高层所需的功能。业务特定的面向连接的协议(SSCOP)位于AAL的特定的集中子层中。SSCOP目前最主要的用途就是应用在信令的AAL中,在“第三层”实体间通过用户网络接口(UNI)和网络结点接口(NNI)使用ATM虚信道传递信息。 相似文献
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本文结合国际电联(ITU)电信标准部(TSS)第XⅢ研究组于1993年7月以加速程序通过的新建议,即I.363建议的第六节“第五类AAL框架”,介绍了B-ISDN中一种新的ATM适配层规范——AAL5。文中重点介绍了AAL5的功能模型、连接方式、运行程序以及其中业务特定会聚子层(SSCS)、公共部分会聚子层(CPCS)和拆装子层(SAR)的功能和工作模式等。最后给出了AAL5适用于帧中继业分和B-ISDN信令消息适配的应用举例。 相似文献
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近日,信息产业部以"信部科(2000)1143号"文发布了"基于ATM的多媒体宽带网信令规范"、"基于ATM的网络接口(PNNI)信令规范"、"B-ISDN ATM适配层(AAL)类型2信令技术规范(能力集-1)"、"B-ISDN ATM适配层(AAL)类型2技术规范"、"ISDN用户-网络接口规范(补充支持IP接入)"、″IP电话业务的编号″、 ″56K bit/s 调制解调器接口及传输性能技术要求和测试方法″等七项通信行业标准。1."基于ATM的多媒体宽带网信令规范"标准的编号为YD/T 1083-2000。该标准规定了国内多媒体通信网初期网络连接中的信令能力以及… 相似文献
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AAL2信令是AAL2网络的神经系统,AAL2信令协议提供了建立、释放和维护AAL2点到点连接的信令能力。本文首先讨论了AAL2信令的结构及工作原理,然后以一个典型的AAL2呼叫过程为例对AAL2信令过程进行了详细描述,并给出了我们的实现方法。文章的研究对实现AAL2交换具有重要意义。 相似文献
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本文介绍了ATM AAL2 Trunking技术的由来及其原理,从窄带侧和宽带侧所支持的接口和协议,从窄带侧和宽带侧对信令的处理,从宽带侧对虚链路的管理等方面重点论述了窄带网络与宽带网络实现互通的方法。同时给出了窄带网络和宽带网络互通的实例,描绘了基于ATM AAL2Trunking实现窄带网络与宽带网络互通的发展前景。 相似文献
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AAL2信令是AAL2网络的神经系统,AAL2信令协议提供了建立、释放和维护AAL2点到点连接的信令能力.本文首先讨论了AAL2信令的结构及工作原理,然后以一个典型的AAL2呼叫过程为例对AAL2信令过程进行了详细描述,并给出了我们的实现方法.文章的研究对实现AAL2交换具有重要意义. 相似文献
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Realization of the economical, reliable, and efficient ATM interface block becomes an important key to development of the ATM switching system when we consider new issues raised recently. In this paper, we summarize requirements for the ATM interface block and present the UNI (User Network Interface)/NNI (Network Node Interface) architecture to meet these requirements. We also evaluate the performance of the multiplexer adopting the various multiplexing schemes and service disciplines. For ATM UNI/NNI interface technologies, we have developed a new policing device using the priority encoding scheme. It can reduce the decision time for policing significantly. We have also designed a new spacer that can space out the clumped cell stream almost perfectly. This algorithm guarantees more than 99 % conformance to the negotiated peak cell rate. Finally, we propose the interface architecture for accommodation of the ABR (Available Bit Rate) transfer capability. The proposed structure that performs virtual source and virtual destination functions as well as a switch algorithm can efficiently accommodate the ABR service. 相似文献
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The US government has long been passing encrypted traffic over commercial/public communications systems. With the proliferation of ATM networks, there is a vital need for government agencies to utilize the high bandwidth these new ATM networks have to offer. This article presents a review of a prototype ATM encryption device that was employed on the ACTS ATM internetwork during a government-sponsored demonstration. The article also describes this device, the FASTLANE ATM encryptor and its fielded prototype, the Interim FASTLANE 相似文献
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Connectionless ATM (CATM) is an extension of ATM that is designed to solve some of the outstanding problems with conventional implementations of ATM. This paper contains the results of the author's research into the capabilities of the technique, possible applications and the practicality of implementation. The most important network-level connectionless protocol is currently the Internet Protocol (IP). Mapping IP onto ATM has proved to be extremely difficult and certainly current solutions are complex and overweight. The need for effective mapping of IP onto ATM is clear. CATM provides a solution to this problem. It is a form of ATM designed so that connectionless protocols (both at the link level and the network level) can be effectively mapped onto an ATM infrastructure while allowing the ATM network to support connection-orientated protocols in the normal way. The result is a true multiservice integrated network 相似文献
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Fahad Hoymany 《International Journal of Network Management》1999,9(6):379-386
This paper gives a detailed evaluation of different ATM adaptation layers in terms of overhead, functionality, efficiency, and performance, and introduces a new adaptation layer that overcomes the shortcomings of existing layers. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献