Redundancy strategies for a high splitting optically amplified passive optical network

Phillips, A.J.; Senior, John M.; Mercinelli, R.; Valvo, Maurizio; Vetter, Peter; Martin, C; Deventer, M.O. van; Vaes, Peter; Qiu, Xinyou

doi:10.1109/50.917866

Cited by 42 publications

(23 citation statements)

References 10 publications

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“…Therefore, protection against a metro node failure is of primary importance for the LR-PON-based architecture. A basic and effective protection mechanism for LR-PON is to dual parent each system onto two metro/outer core nodes [4], [2]. This is similar to a simple protection solution for IP routers known as double or redundant protection [5].…”

Section: Problem Descriptionmentioning

confidence: 99%

“…In this work we have considered protection links up to the first PON split (or local exchange site), leaving the "last-mile" unprotected. This is a common choice for residential customers, while protection can be extended to the user premises for business customers [4], [2]. For example, considering Figure 1, if metro node 1 fails, its PONs will be protected by metro node 2.…”

Section: Problem Descriptionmentioning

confidence: 99%

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A Combinatorial Optimisation Approach to the Design of Dual Parented Long-Reach Passive Optical Networks

Cambazard

Mehta

O’Sullivan

et al. 2011

2011 IEEE 23rd International Conference on Tools With Artificial Intelligence

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Abstract-We present an application focused on the design of resilient long-reach passive optical networks. We specifically consider dual parented networks whereby each customer must be connected to two metro sites via a local exchange sites. An important property of such a placement is resilience to single metro node failure. The objective of the application is to determine the optimal position of a set of metro-nodes such that the total optical fibre length is minimised. We prove that the decision variant of this problem is NP-Complete. We present three alternative combinatorial optimisation approaches to finding an optimal metro node placement using: a mixed integer linear programming formulation of the problem; a hybrid approach that uses clustering as a preprocessing step; and, finally, a local search approach. We consider a detailed case-study based on a network for Ireland. The hybrid approach scales well and finds solutions that are close to optimal, with a runtime that is two orders-of-magnitude better than the MIP model. The local search approach is consistently good on all benchmarks.

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Section: Problem Descriptionmentioning

confidence: 99%

Section: Problem Descriptionmentioning

confidence: 99%

A Combinatorial Optimisation Approach to the Design of Dual Parented Long-Reach Passive Optical Networks

Cambazard

Mehta

O’Sullivan

et al. 2011

2011 IEEE 23rd International Conference on Tools With Artificial Intelligence

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show abstract

“…A catastrophic failure at a Metro/Core (MC) node could bring down all the PONs terminated by the node (e.g., potentially hundreds of thousand of customers), for a period of time that, depending on the severity of the accident, could be as long as several weeks. Although such large-scale failures are rare, it is recognized [18] that the catastrophic effects they would cause would not be tolerable, therefore its risk cannot be neglected.…”

Section: Related Work On Gpon Protection and Its Lr-pon Evolutionmentioning

confidence: 99%

Deployment Strategies for Protected Long-Reach PON

Ruffini

Mehta

O’Sullivan

et al. 2012

J. Opt. Commun. Netw.

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Abstract-The mass deployment of fibre access networks is probably the most important network upgrade strategy for operators over the coming decade. Next generation networks, and in particular the Long-Reach Passive Optical Network (LR-PON) solution, aim to increase long term economic viability and sustainability of Fibre-To-The-Premises (FTTP) deployment. The LR-PON solution achieves this by minimising the number of nodes and the amount of electronic equipment required within the network. Since a LR-PON replaces the metro backhaul network, which is usually a protected part of the network, protecting the long reach part of LR-PON network against failures becomes a critical issue that needs to be taken into account. In this paper we introduce a novel protection mechanism that, by spreading the load generated by a node failure over the network, can significantly reduce the overall protection capacity required. We then present a practical FTTP deployment scenario based on our protected LR-PON architecture for a European country. The problem is modeled using Integer Linear Programming and the optimisation results, obtained using a real dataset provided by a national operator, show that a small number of Metro/Core nodes can provide protected connection to FTTP users. By applying a detailed cost model to the outcome of the optimisation we are able to show that our LR-PON deployment strategy that minimises the overall protection capacity, rather than just minimising fibre distances in the LR-PON, can significantly reduce costs.Index Terms-Long-Reach passive optical networks, network protection and resiliency, network optimization, cost analysis.

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“…There have been several efforts on providing survivability for a dual-homed IP-based access network over WDM-based core networks [10], [11]. In all this literature, the authors consider providing survivability separately at the IP layer, as well as at the WDM layer.…”

mentioning

confidence: 99%

“…In all this literature, the authors consider providing survivability separately at the IP layer, as well as at the WDM layer. In [10], the authors discuss how to support dual homing in passive optical networks, while [11] studies survivability in IP-over-WDM networks and provides different protection types (unprotected, protected, and dual homing) for each IP link, in order to keep the networks connected in the event of link failure. The focus of our paper is to present a coordinated solution for providing protection in an IP-over-WDM dual-homing network.…”

mentioning

confidence: 99%

Dual-homing protection in IP-over-WDM networks

Wang

Vokkarane

Jothi

et al. 2005

J. Lightwave Technol.

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Abstract-A fault-tolerant scheme, called dual homing, is generally used in IP-based access networks to increase the availability of the networks. In a dual-homing architecture, a host is connected to two different access routers; therefore, it is unlikely that the host will be denied access to the network as the result of an access line break, a defective power supply in the access router, or congestion of the access router. This dual-homing architecture in the access network imposes the overhead to provide protection in the core network. Scaling the next-generation IP-over-wavelengthdivision-multiplexing (WDM) Internet, and being able to support a growing number of such dual-homing connections, as well as protection, demands a scalable mechanism to contain this overhead for protection in the WDM networks. This paper studies the coordinated protection design to reduce the protection cost in the WDM core network, given a dual-homing infrastructure in the access network. The protection problem is considered for both static and dynamic traffic. Several solutions are proposed, and the performances of the solutions are compared. We also prove that one of the proposed algorithms gives a solution that, in the worst case, is at most 4/3 times the cost of the optimal solution.Index Terms-Dual homing, lightpath, protection, wavelength division multiplexing (WDM).

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Redundancy strategies for a high splitting optically amplified passive optical network

Cited by 42 publications

References 10 publications

A Combinatorial Optimisation Approach to the Design of Dual Parented Long-Reach Passive Optical Networks

A Combinatorial Optimisation Approach to the Design of Dual Parented Long-Reach Passive Optical Networks

Deployment Strategies for Protected Long-Reach PON

Dual-homing protection in IP-over-WDM networks

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