Energy-Aware Weight Assignment Framework for Circuit Oriented GMPLS Networks

A branch of green networking research is consolidating. It aims at routing traffic with the goal of reducing the network energy consumption. It is usually referred to as Energy- Aware Routing. Previous works in this branch only focused on pure IP networks, e.g., assuming an Open Shortest Path First (OSPF) control plane, and best effort packet forwarding on the data plane. In this work, we consider instead Generalized Multi-Protocol Label Switching (GMPLS) backbone networks, where optical technologies allow to design "circuit switching" network management policies with strict bandwidth reservation policies. We define a simple and generic framework which generates a family of routing algorithms, based on an energy-aware weight assignment. In particular, routing weights are functions of both the energy consumption and the actual load of network devices. Using such weights, a simple minimum-cost routing allows finding the current least expensive circuit, minimising the additional energy cost. Results obtained on realistic case studies show that our weight assignment policy favours a consistent reduction of the network power consumption, without significantly affecting the network performance. Furthermore, the framework allows to trade energy efficiently and network performance, a desirable property at which ISPs are looking for. Simple and robust parameter settings allow reaching a win-win situation, with excellent performance in terms of both energy efficiency and network resource utilization

Energy efficiency considerations in integrated IT and optical network resilient infrastructures

The European Integrated Project GEYSERS - Generalised Architecture for Dynamic Infrastructure Services - is concentrating on infrastructures incorporating integrated optical network and IT resources in support of the Future Internet with special emphasis on cloud computing. More specifically GEYSERS proposes the concept of Virtual Infrastructures over one or more interconnected Physical Infrastructures comprising both network and IT resources. Taking into consideration the energy consumption levels associated with the ICT today and the expansion of the Internet in size and complexity, that incurring increased energy consumption of both IT and network resources, energy efficient infrastructure design becomes critical. To address this need, in the framework of GEYSERS, we propose energy efficient design of infrastructures incorporating integrated optical network and IT resources, supporting resilient end-to-end services. Our modeling results quantify significant energy savings of the proposed solution by jointly optimizing the allocation of both network and IT resources

Energy efficiency in optical networks

This paper proposes a new framework, specifically designed for introducing and suitably managing/using green metrics in ASON/GMPLS Optical Transport Networks (OTNs). The core element of such a framework is the Green Abstraction Layer (GAL), a standard interface proposed by the ECONET project, which has been specifically designed to give a simplified a common view of power management primitives available in next-generation green network equipment. The Green Abstraction Layer allows to extract available power management settings, and to set the desired configuration into a device, hiding heterogeneous and complex details of device internal physical architecture of nodes

F. Gottardo, J. Mir , G.Parladori

In this paper a new block-based technique for image prefiltering is proposed, in order to overcome some limits of the MPEG--2 encoding process at low bitrates. The presented scheme performs a suitable classification of the blocks in the images based on motion estimation taking into account the characteristics of the human visual system. The information on the motion intensity, extracted from each image, is used to locally vary the filtering parameters of a nonlinear adaptive low-pass filter. 1. INTRODUCTION The use of compression algorithms at low bitrate often introduces annoying artifacts. This applies also to the MPEG-- 2 algorithm, where the encoding process typically reduces the visual quality of image sequences, especially when the bitrate decreases below 6 \Xi 8 Mbit/s. Furthermore, the presence of noise at the encoder input can significantly impact on the performance of the coding operation, resulting in a lower quality of the compressed signal. It is possible to overcome this ..

Coexistence of OTN and VCSEL-based DMT Channels for Multi-Tb/s Transmission in Metropolitan Area Networks

We demonstrate the coexistence of 100G-200G OTN channels with a novel transmitter technology based on directly modulated VCSELs exploiting DMT. Multi-Tb/s transmission is achieved in links typical of the metro network

Performance Comparison between Electrical and Optical Backplanes

Comparison between performance of copper interconnections and fiber optics backplane is shown also by simulations to demonstrate their limitations in frequency and capabilities in terms of capacity, power budget and consumption