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On the dimensioning of survivable optical metro/core networks with dual-homed access

机译：关于具有双归属访问的可存活光学城域/核心网络的尺寸确定

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Long-reach passive optical networks (LR-PONs) are able to effectively support the growing demand of traffic originating from residential and business customers. Failures of metro/core (M/C) nodes serving the traffic to/from the access networks covered by LR-PONs, may potentially affect hundreds or thousands of customers. One way of guaranteeing 100% survivability from single-node failures is to apply dual-homing, where each LR-PON is connected to two M/C nodes, and combine it with node-disjoint dedicated-path protection (DPP). In this paper, we present a new approach to provide network survivability against single M/C node failures. Instead of applying dedicated path protection (DPP) strategy, which can require huge amount of extra resources, we combine an unprotected network design with a dynamic multilayer restoration algorithm. Our aim is to determine a suitable amount of resource overbuild (in terms of extra transponders) needed to provide average connection availability close to that guaranteed by DPP. Preliminary results show that dimensioning for the worst-case scenario among a set of predefined M/C node failures, i.e., the one disrupting the highest number of connections, yields to a cost-effective strategy requiring up to 35% less transponders than DPP, while offering the same average connection availability.
机译：长距离无源光网络（LR-PON）能够有效地支持来自住宅和企业客户的不断增长的流量需求。为往返于LR-PON覆盖的接入网络的流量提供服务的城域/核心（M / C）节点发生故障可能会影响成百上千的客户。确保单节点故障100％生存能力的一种方法是应用双归，其中每个LR-PON都连接到两个M / C节点，并将其与不相交的节点专用路径保护（DPP）结合在一起。在本文中，我们提出了一种新的方法来提供针对单个M / C节点故障的网络生存能力。我们没有采用可能需要大量额外资源的专用路径保护（DPP）策略，而是将不受保护的网络设计与动态多层恢复算法结合在一起。我们的目标是确定适当数量的资源过度构建（根据额外的转发器），以提供接近DPP保证的平均连接可用性。初步结果表明，在一组预定义的M / C节点故障中针对最坏情况进行评估（即中断最大数量的连接）会产生一种经济高效的策略，与DPP相比，转发器的数量最多减少了35％，同时提供相同的平均连接可用性。

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