共查询到18条相似文献,搜索用时 265 毫秒
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冯健 《微电子学与计算机》2012,29(9):113-115,120
为了实现同步数字体系(Synchronous Digital Hierarchy,SDH)自愈环中业务和时钟合理、正确、实时地保护倒换,提出了一种基于自动保护倒换(Automatic Protection Switching,APS)协议和段开销中同步状态字节S1的保护倒换方案.针对网管台下发的倒换命令、引发倒换的告警、上游端点传送的K1、K2字节分别处理,实现了业务的保护倒换并引发相应的时钟倒换.通过对典型操作实例的测试,验证了该方案的有效性和实时性. 相似文献
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经过近几年的发展,PON技术日益成熟,要保障工程应用中业务的稳定性,应对各种通信中断故障,就需要实现PON保护倒换技术。分析设计了1种PON保护倒换机制和流程,可以满足A、B类保护业务中断时间小于150 ms,C类保护业务中断时间小于50 ms,实现安全、准确、快速PON保护倒换。 相似文献
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在SDH传输系统的网络保护方式中,双纤双向复用段保护环由于节省传输带宽、配置简单等优点被广泛应用。但是,网络规模的增长和传输业务种类的增多,对保护倒换的成功率提出了更高的要求。因为复用段保护倒换采用APS(Automatic Protection Switching,自动保护开关)协议,所以各网元的协议处理和保护通路的正常是保护倒换成功的先决条件。也就是说,环网上的任何一个网元不正常都能导致倒换失败,以致当出现线路故障时无法有效地保护业务。 相似文献
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SDH倒换故障处理实例 总被引:1,自引:0,他引:1
基于各种不同保护机理的SDH自愈环大大提高了网络的生存能力,使之在出现故障的情况下,无需人为干预,就能在极短的时间内从失效的故障状态自动恢复传输所携带的业务,使网络具备一种可替代的传输路由.但是自愈网络也有失去保护的时候,当保护倒换协议出现异常,传输业务就会中断.本文就SDH网络MSP(复用段保护)环倒换失败进行原因分析和处理. 相似文献
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PTN网络商用初期,主要采用线性保护实现业务在网络内部的自动保护倒换,随着PTN环网保护技术的发展成熟,线性保护不再是网络内保护的唯一选择。本文将从网络可靠性、配置和维护便利性、资源利用率、适用网络拓扑和网络扩容能力等几方面,对PTN线性保护和环网保护进行对比分析。 相似文献
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分析光纤自动切换保护系统的原理,以我公司为例,在光传输网络主要路由上,接入光纤自动切换保护器,利用保护器构建出光纤保护网络,当被保护的光纤发生故障中断或者衰耗增大导致通信传输质量下降时,光纤线路自动切换保护技术却能使网络进行实际切换,用恢复机制作为第二道防线对付网络范围的故障和失效,恢复通信的畅通,从而增强了我公司通信网络的可靠性。 相似文献
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为满足ITU-T标签本地化的要求,讨论了一种改进型的基于Wrapping保护的环网保护方案,详细论述了通路建立与倒换机制,介绍了相关功能模块的架构,并对保护倒换时间进行了测试验证。该环网保护方案的保护倒换时间满足工程应用50 ms要求,可为分组传送网承载业务提供有效的网络级保护。 相似文献
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This paper presented a simple monitoring, protection switching, and fast restoration approach for fiber to the home passive optical network (FTTH-PON) using Access Control System (ACS). ACS is developed for centralized monitoring and failure detection from central office (CO) in downstream direction (from CO towards customer sides). The proposed system architecture incorporating low cost and enable the network service providers and field engineers to remotely control the testing module from anywhere in the world and automatically identify any fiber fault and address the failure location in the fiber field. Another unique function of ACS is to provide the activation for optical switching in a restoration scheme which implemented at the drop region of FTTH-PON. A protection device named Customer Protection Device that comprises of programmable optical switches will be employed at the customer sides, just before the optical network unit, for rerouting the disrupted signals to the protection line when failure occurs in the working line to ensure continuous service delivery to customers. 相似文献
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Strategy for protection and restoration of optical paths in WDM backbone networks for next-generation Internet infrastructures 总被引:1,自引:0,他引:1
This paper proposes and analyzes a strategy for protection and restoration of optical paths in wavelength division multiplexing (WDM) networks for next-generation Internet infrastructure. Assuming a network model in which a multiprotocol label switching (MPLS) layer is overlaid on top of a WDM layer, and a segregation of the traffic on a wavelength basis, the strategy is based on a network dimensioning aiming at: 1) the support of different types of traffic, relating to different service categories; 2) the guarantee that all the wavelength paths carrying mission-critical services (with stringent quality of service requirements) are protected against failure; and 3) the possibility of restoring a large amount of wavelength paths carrying Internet best-effort services, i.e., low-priority (LP) preemptible traffic with no QoS requirements. The reference network scenario is an overlay model in which the optical network interacts with an MPLS network with a separated control plane; the optical network manages its resources to better serve the traffic coming from the MPLS network. Two path protection schemes, namely, disjoint path (DP) and single-link basis (SLB), and a link protection mechanism, namely, local repair (LP), are investigated. Furthermore, the paper considers both the case of using wavelength conversion in the optical nodes and the case in which wavelength conversion is not used at all. The analysis compares the performance of the different strategies in terms of the percentage of optical paths carrying LP traffic not served by the optical network after a failure and of the dimensions of the optical nodes for all the schemes. The analysis reveals that the proposed approach allows the restoration of a large amount of best-effort traffic with a reasonable increase of network redundancy. 相似文献
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随着业务需求的剧增,业内对直接承载业务的传输系统的安全性提出了更高的要求,OLP(光纤线路自动切换保护)以其响应速度快、切换时间短等特点,在高速率光传输网中获得了广泛应用,但同时也给网络的维护管理带来了新的问题和挑战.文章从OLP机制的原理入手,深入剖析OLP在现网应用中存在的实际问题,创新性地提出了OLP改进方案,该... 相似文献