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

J. Izquierdo-Zaragoza, M. Furdek, A. Nag, P. Monti, L. Wosinska, P. Pavón-Mariño
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Abstract

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.
具有双归属接入的可生存光城域网/核心网的尺寸研究
长程无源光网络(lr - pon)能够有效地支持来自住宅和商业用户日益增长的流量需求。为lr - pon覆盖的接入网提供流量服务的城域/核心(M/C)节点的故障可能会影响数百或数千个客户。保证单节点故障100%存活的一种方法是应用双归巢,其中每个LR-PON连接到两个M/C节点,并将其与节点分离专用路径保护(DPP)相结合。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。为了避免使用需要大量额外资源的专用路径保护(DPP)策略,我们将无保护的网络设计与动态多层恢复算法相结合。我们的目标是确定提供接近DPP保证的平均连接可用性所需的适当数量的资源过度构建(就额外的应答器而言)。初步结果表明,在一组预定义的M/C节点故障(即中断连接数量最多的故障)中,对最坏情况进行尺寸划分,可以产生比DPP节省35%应答器的成本效益策略,同时提供相同的平均连接可用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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