Cost modeling and evaluation of capital expenditures in optical multilayer networks

Huelsermann, Ralf; Gunkel, Matthias; Meusburger, Clara; Schupke, Dominic

doi:10.1364/jon.7.000814

Cited by 127 publications

(78 citation statements)

References 6 publications

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“…Non-power consumption publications we build upon -In [6], a capital expenditures (CapEx) model is given for optical multilayer networks, subdividing the network in four layers: Internet protocol/multiprotocol label switching (IP/MPLS), Ethernet, synchronous digital hierarchy/optical transport network (SDH/OTN) and wavelength division multiplexing (WDM). Detailed normalized monetary cost values of equipment in each layer are listed in this paper.…”

Section: Related Workmentioning

confidence: 99%

“…To provide consistent power consumption values, we provide: Building on the CapEx work presented in [6], we consider the multilayer network and associated equipment to be subdivided in the following four layers:…”

Section: Reference Power Consumption Valuesmentioning

confidence: 99%

“…Following the convention in [6], the equipment in the IP/MPLS layer consists of three building blocks (see Fig. 1).…”

Section: Ip/mpls Layermentioning

confidence: 99%

“…To avoid misunderstanding, we first give an overview of the main terminology of the WDM components in this paper. For a more detailed explanation, see [6] or [16].…”

Section: Wdm Layermentioning

confidence: 99%

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Power consumption modeling in optical multilayer networks

et al. 2012

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-The evaluation and reduction of energy consumption of backbone telecommunication networks has been a popular subject of academic research for the last decade. A critical parameter in these studies is the power consumption of the individual network devices. It appears that across different studies, a wide range of power values for similar equipment is used. This is a result of the scattered and limited availability of power values for optical multilayer network equipment. We propose reference power consumption values for Internet protocol/multiprotocol label switching (IP/MPLS), Ethernet, optical transport networking (OTN) and wavelength division multiplexing (WDM) equipment. In addition we present a simplified analytical power consumption model that can be used for large networks where simulation is computationally expensive or unfeasible. For illustration and evaluation purpose, we apply both calculation approaches to a case study, which includes an optical bypass scenario. Our results show that the analytical model approximates the simulation result to over 90% or higher, and that optical bypass potentially can save up to 50% of power over a non-bypass scenario.

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Section: Related Workmentioning

confidence: 99%

Section: Reference Power Consumption Valuesmentioning

confidence: 99%

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Power consumption modeling in optical multilayer networks

et al. 2012

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“…We assume an IP over WDM network composed of the virtual topology and the underlying physical topology where the node architecture is similar to [8]. Each node is composed of an optical cross connect and a packet router, e.g., an IP router where short reach interfaces are assumed between the router and the optical switch.…”

Section: Power Modelmentioning

confidence: 99%

Energy-aware virtual topology reconfiguration under dynamic traffic

Yayimli

Çavdar

2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

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In an IP over WDM network architecture, IP traffic is carried over a virtual topology (VT), composed of optical transparent channels called lightpaths. We propose an energy-efficient dynamic VT adaptation method with sleep mode, which allows changing only one lightpath connectivity at a time by dynamically monitoring the IP packet traffic load on each lightpath. In order to assure the connectivity of future traffic increase a high-load threshold is used. When the packet traffic load on a specific lightpath becomes higher than a threshold, a new lightpath is added to the virtual topology. However this congestion avoidance policy increases the power consumption by activating transponders in the network. Therefore at the same time lightly loaded lightpaths are eliminated in the virtual topology by using a low-load threshold. Energy-efficient virtual topology adaptation is achieved by traffic offloading considering both lightly loaded and heavily loaded links in the network. In this regard, high-and low-load threshold values need to be carefully determined in order to both gain power and ensure load balancing with keeping the stability of virtual connectivity at a reasonable level.We have analysed the power consumption of the network during 48-hours for different values of low-and high-load thresholds together with the impact of different threshold values on the stability of the virtual topology. We have shown that there is a trade-off between number of changes in the virtual topology and the energy-efficiency. Experimental results demonstrate that a good compromise can be achieved by adjusting the high-and low-load thresholds carefully. Keywords: Energy-efficiency, IP over WDM networks, optical WDM networks, virtual topology reconfiguration, dynamic traffic. INTRODUCTIONInternet has become a significant part of our daily life leading to a rapid increase in traffic rates. Power consumption per user is continuously increasing although power consumption per bit is decreasing with the evolution of power efficient devices in telecommunication networks. In order to meet the requirements of this increasing traffic demands, today's optical wavelength division multiplexing (WDM) networks as a backbone transmission system, is designed to be over-dimensioned, with extra switching capacity and excess number of deployed links, taking into account the peak rates and future growth of the traffic, resulting in waste of energy.In an IP over WDM network architecture, IP traffic is carried over a virtual topology (VT), composed of optical transparent channels called lightpaths. In transparent optical networks, lightpaths are the most power consuming elements due to the electro-optical operations during the add/drop. Generally, the intensity of traffic on lightpaths follows a daily traffic profile, decreases during the early hours of the morning, starts to increase again after 9 am, and peaks during the daytime. In different time zones, the peak traffic intensities occur at different times, relative to a global clock reference...

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