Next Generation Access and Digital Divide: Opposite Sides of the Same Coin?

Geographical averaging of retail and wholesale prices could distort incentives for bypass entry in both the metropolitan and the high-cost areas. The two-instrument approach to universal service support, proposed in (Armstrong, 2001), could enhance efficiency, through competitive and technological neutrality. Alternatively, the industry support to high cost areas could be substituted by redistributive fiscal measures or public subsidies. Using evidence from Italy we suggest that tackling demographic, educational, and income inequalities is necessary, even in low cost areas, to support further broadband penetration. We estimate logistic regressions of Internet and broadband use at home, and show that a substantial increase of broadband penetration is possible in Italy only if specific platforms and applications are made available to older and less educated households. Therefore, a critical mass of services could help reaching the critical mass of users that make Next Generation Access Networks viable. --Infrastructural Digital divide,Cultural Digital Divide,Geographical crosssubsidies,Efficient bypass,Critical mass of services

Entanglement Distribution in Optical Networks

The ability to generate entangled photon-pairs over a broad wavelength range opens the door to the simultaneous distribution of entanglement to multiple users in a network by using centralized sources and flexible wavelength-division multiplexing schemes. Here we show the design of a metropolitan optical network consisting of tree-type access networks whereby entangled photon-pairs are distributed to any pair of users, independent of their location. The network is constructed employing commercial off-the-shelf components and uses the existing infrastructure, which allows for moderate deployment costs. We further develop a channel plan and a network-architecture design to provide a direct optical path between any pair of users, thus allowing classical and one-way quantum communication as well as entanglement distribution. This allows the simultaneous operation of multiple quantum information technologies. Finally, we present a more flexible backbone architecture that pushes away the load limitations of the original network design by extending its reach, number of users and capabilities.Comment: 26 pages, 12 figure

Energy-efficient traffic engineering

The energy consumption in telecommunication networks is expected to grow considerably, especially in core networks. In this chapter, optimization of energy consumption is approached from two directions. In a first study, multilayer traffic engineering (MLTE) is used to assign energy-efficient paths and logical topology to IP traffic. The relation with traditional capacity optimization is explained, and the MLTE strategy is applied for daily traffic variations. A second study considers the core network below the IP layer, giving a detailed power consumption model. Optical bypass is evaluated as a technique to achieve considerable power savings over per-hop opticalelectronicoptical regeneration. Document type: Part of book or chapter of boo

How Has Hospital Consolidation Affected the Price and Quality of Hospital Care?

Provides an overview of the wave of hospital consolidation in the 1990s and reviews the literature on its effects on the prices, costs, and quality of inpatient care. Analyzes the studies' findings and discusses implications for policy makers

Benchmarking and viability assessment of optical packet switching for metro networks

Optical packet switching (OPS) has been proposed as a strong candidate for future metro networks. This paper assesses the viability of an OPS-based ring architecture as proposed within the research project DAVID (Data And Voice Integration on DWDM), funded by the European Commission through the Information Society Technologies (IST) framework. Its feasibility is discussed from a physical-layer point of view, and its limitations in size are explored. Through dimensioning studies, we show that the proposed OPS architecture is competitive with respect to alternative metropolitan area network (MAN) approaches, including synchronous digital hierarchy, resilient packet rings (RPR), and star-based Ethernet. Finally, the proposed OPS architectures are discussed from a logical performance point of view, and a high-quality scheduling algorithm to control the packet-switching operations in the rings is explained

Low_Tech Innovation in a High-Tech Environment? The Case of the Food Industry in the Vienna Metropolitan Region

This paper explores the opportunities for low-tech innovations in regional high-tech contexts. The literature suggests that traditional sectors tend to be only weakly integrated in such socio-institutional environments, because the specific innovation mode of low-tech industries is not compatible with the institutional framework of high-tech. Focusing on the empirical case of the food industry situated in the Vienna metropolitan region, the paper provides evidence that the link between old industries and their high-tech contexts may be more complex than commonly thought. Drawing on 20 face-to-face interviews with local companies, knowledge providers (universities and other research organisations) and industry experts it is highlighted that strong and weak forms of integration in the regional innovation system (RIS) co-exist, depending on the specific RIS dimension under consideration. Innovative companies in the local food sector, thus, embed themselves in a selective way in their regional institutional context. They make use of the scientific competences available within the RIS whilst at the same time they tend to “bypass” the RIS and tap into knowledge sources located outside the region.

High-resolution optical frequency dissemination on a telecommunication network with data traffic

We transferred the frequency of an ultra-stable laser over a 108 km urban fiber link comprising 22 km of optical communications network fiber simultaneously carrying Internet data traffic. The metrological signal and the digital data signal are transferred on two different frequency channels in a dense wavelength division multiplexing scheme. The metrological signal is inserted into and extracted from the communications network by using bidirectional off-the-shelf optical add-drop multiplexers. The link-induced phase noise is measured and cancelled with round-trip technique using an all-fiber-based interferometer. The compensated link shows an Allan deviation of a few 10-16 at one second and below 10-19 at 10,000 seconds. This opens the way to a wide dissemination of ultra stable optical clock signals between distant laboratories via the Internet network

Use and value of ICTS for separated families

This paper considers the ways in which ICT usage impacts upon the communication patterns of young people from separated and intact families. Based on two research projects – one quantitative and one qualitative – it explores the ways in which young people both use and value mobile phones and internet access as means of intervening in family communication patterns