共查询到19条相似文献,搜索用时 140 毫秒
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一种基于ITU-T G.8032的多级保护倒换机制 总被引:1,自引:0,他引:1
ITU-T G.8032协议只定义了以太环网中一级链路故障情况下的保护方案,对于多级链路故障,缺乏具体的解决方案。文章阐述了ITU-T G.8032中单环和多环的工作原理,分析了多环中存在的问题及缺陷,在此基础上提出了一种针对多环的多级保护倒换机制。该机制利用多环中虚链路的概念,通过对虚链路故障检测以及虚链路保护进行研究,实现了对以太环网中多级链路故障的保护。测试结果表明,多级保护倒换的时间在50ms以内,满足电信级以太网的网络自愈时间要求,提高了以太网的可靠性。 相似文献
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A novel ring protection switching mechanism 总被引:1,自引:0,他引:1
环网保护是ITU-T和IETF联合工作组正在研究的多协议标签交换传送应用(MPLS-TP)关键技术之一。在研究现有的环网保护方案的基础上,提出了一种新颖的快速“Wrapping”环网保护倒换机制以及对应的分布式实现方式。运用这种快速的“Wrapping”环网保护倒换机制及其对应的分布式实现方式,可以降低在保护倒换中数据的丢失率。同时,分布式实现方式易于增加保护组容量,简化网络管理操作,增强设备可靠性。 相似文献
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生存性是光传送网(OTN)的一个重要研究课题,文章介绍了OTN数字包封帧结构中用于故障监测和保护倒换的字节安排;以基于ODUk的OTN环网保护为例,重点分析了在OTN环网保护中近侧倒换和远侧倒换时的APS信令传递机制. 相似文献
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传统的通道保护倒换采用软件方式进行,但对于大容量设备来说,软件方式无法满足ITU-T的倒换时间要求,尤其是对于TUG3或TU12颗粒的低阶通道保护.信息辅助保护倒换将通道的告警信息编成一定的码字,再将其插入到本通道空闲的开销字节中,以实现全硬件的自动保护倒换.这种倒换不仅可以保证满足系统50 ms的倒换时间要求,而且可以大大降低微处理器的负荷. 相似文献
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本文依据一个有关传输工程建设的案例,即某运营商对某地区进行的关于保护倒换时间的测试,对SDH自动保护倒换进行了简单的分析及思考。本文根据SDH自动保护倒换机制、ITU-T和国家通信标准,在理论上对该地区自动保护倒换时间进行了计算,并将其与实际相比较,依据各方面的论述得出该地区保护倒换时间满足规范化要求的结论。 相似文献
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本文依据一个有关传输工程建设的案例,即某运营商对某地区进行的关于保护倒换时间的测试,对SDH自动保护倒换进行了简单的分析及思考.本文根据SDH自动保护倒换机制、ITU-T和国家通信标准,在理论上对该地区自动保护倒换时间进行了计算,并将其与实际相比较,依据各方面的论述得出该地区保护倒换时间满足规范化要求的结论. 相似文献
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RPR是由顺时针、逆时针两个传输方向光环组成的,这种组网方式赋予RPR的健壮性。RPR的保护倒换机制主要有两种:采用定向保护机制和采用回绕保护机制。首先概述了RPR网络保护协议,然后分析了RPR的保护倒换机制及RPR的网络保护与SDH保护方式的互通。 相似文献
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Ethernet ring protection is a new technology introduced in ITU‐T Recommendation G.8032, which utilizes the generic Ethernet MAC functions. We introduce an alternative enhanced protection switching scheme to suppress penalty in the switching transient, in which the Ethernet MAC filtering database (FDB) is actively and directly modified by information disseminated from the nodes adjacent to failure. The modified FDB at all nodes are guaranteed to be consistent to form a complete new ring network topology immediately. This scheme can reduce the capacity requirement of the G.8032 by several times. This proposed scheme can be also applied in IP protection rings. 相似文献
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《Communications Magazine, IEEE》2008,46(9):136-143
Ethernet technologies are rapidly gaining importance as a prevailing solution for carrier networks. Ethernet ring protection switching, defined in ITU-T Recommendation G.8032, provides a means of achieving carrier network requirements for ring network topologies. This article outlines the novel concepts in this Ethernet ring protection switching mechanism and discusses the fundamental operating principles by which the automatic protection switching (APS) protocol works. In addition, several feature enhancements in protection behavior and solutions being considered for the next phase of standardization are discussed. 相似文献
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系留气球是一种通用航空平台,测控系统是其核心电子设备.为了满足测控系统稳定可靠、能够长时间连续滞空工作的要求,采用球控单机双冗余热备份、双通道高精度微差压检测、故障相关识别、自适应光纤和无线通信通道切换等设计方法.通过执行世博安保任务,测控系统连续7个月不间断无故障工作,验证了测控系统具有高可靠性和安全性,能够满足系统... 相似文献
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Highly reliable optical bidirectional path switched ring networks applicable to photonic IP networks 总被引:1,自引:0,他引:1
Hayashi M. Ohara K. Tanaka H. Daikoku M. Otani T. Suzuki M. 《Lightwave Technology, Journal of》2003,21(2):356-364
The reliability of the optical bidirectional path switched ring (OBPSR) network is studied by using optical networking equipment (ONE) with microelectromechanical system (MEMS)-based optical switching fabrics. The reliability of the wavelength path in OBPSR networks is shown to be highly dependent on redundant schemes of switching fabrics in the ONE. This study proposes a new redundant scheme utilizing optical couplers together with controlled switch fabrics without using active selectors, and shows that reliability of the wavelength path can be remarkably improved. A fast redundant switching operation of 10 ms was experimentally confirmed with a prototype of the ONE based on the proposed redundant switching fabrics. Furthermore, interworking operations in terms of the protection and restoration between the optical layer and the Internet protocol (IP) layer are experimentally investigated. In a 500-km optical ring network, fast wavelength path protection switching was confirmed without reconfiguring the link state database of the IP layer, and the measured protection time in the IP layer was as short as 21 ms. 相似文献