Achille Pattavina

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The development of optical cross-connect architectures is a very important topic today. We consider here in particular the class of optical space-division switching fabrics configured as multistage structures built with 2 2 optical switching elements (SEs) and derived from a combination of vertical replication and horizontal expansion of Banyan networks. We(More)
As Internet traffic is estimated to substantially grow in the near future, one of the most challenging issues will concern the reduction of its power requirement. For the core/transport section of the Internet, various network architectures can be considered, typically multi-layer architectures composed of an optical wavelength division multiplexing (WDM)(More)
Recent trends in bandwidth markets show that customers are tending to ask providers for a large bandwidth but for a limited amount of time to support new short-term bandwidth-hungry applications. In order to meet these new requirements, progress in network technologies (fast and reconfigurable switching equipment) and protocols [such as generalized(More)
The advantages of employing passive optical architectures in the access network have been largely recognized. Particularly, recent developments in optical technologies have made the realization of wavelength division multiplexing passive optical networks (WDM PONs) feasible and cost-effective. These networks are more future-proof than conventional PONs,(More)
Energy consumption in telecommunication networks keeps growing rapidly, mainly due to emergence of new Cloud Computing (CC) services that need to be supported by large data centers that consume a huge amount of energy and, in turn, cause the emission of enormous quantity of CO<sub>2</sub>. Given the decreasing availability of fossil fuels and the raising(More)
The ever-increasing Internet traffic demand introduces new challenges for telecommunications carriers. Telecom networks will have to be upgraded to cope with the new capacity requirements. However, deploying enough capacity is not the only requirement for network operators. The impact of new technologies in terms of capital investment and energy consumption(More)
Due to the importance that mobile telecommunication systems are assuming in voice networks, this paper addresses the problem of modelling the traffic that characterizes cellular systems. Starting from experimental data provided by a mobile telecom operator, the two aspects of interarrival times and holding times of voice calls are considered. For each of(More)
Progress in network technologies and protocols is paving the road towards flexible optical transport networks, in which dynamic leasable circuits could be set up and released on a short-term basis according to customers requirements. Recently, new solutions for automated network management promise to allow customers to dinamically specify the terms of the(More)
Cloud Computing (CC) services are rapidly catching on as an alternative to conventional office-based computing. As cloud computing adoption increases, the energy consumption of the network and of the computing resources that underpin the cloud is growing and causing the emission of enormous quantities of CO<sub>2</sub>. Research is now focusing on novel(More)