Portugal Telecom

About: Portugal Telecom is a company organization based out in Lisbon, Portugal. It is known for research contribution in the topics: Quality of service & WiMAX. The organization has 144 authors who have published 230 publications receiving 2686 citations.

Interface design for IT service management practice

Abstract: As the worldwide economy becomes increasingly service-based, companies have a growing need for the adoption of IT Service Management (ITSM) best practices, tools, and methodologies. The Information Technology Infrastructure Library (ITIL) is a set of best practices in ITSM and is now highly adopted by the industry. However, implementing ITIL is complex and costly, and enterprises that design, adopt and provide ITSM services, often end up with different analysis methods and designs for similar ITSM solutions. Aiming at reducing costs and standardizing ITIL-based implementations we propose a methodology to build ITIL conformant interfaces for its processes and functions. This methodology aims for the standardization and partial automation of the construction of reusable software components that are ITIL conformant. It promotes software reuse for ITSM /ITIL solutions market, through the future development of ITSM interfaces.

SWOT analysis for TV white spaces

Abstract: The digital dividend will occur when the transition from analogue to digital television TV becomes effective. The freed and interleaved spectrum, known as TV white spaces TVWS, may be a good opportunity for business related with new wireless services based on software-defined radio SDR and cognitive radio CR technologies. In this scope, the strengths, weaknesses, opportunities and threats SWOT analysis-which is a tool to help in the identification of inner internal origin and outer external origin factors of a company, service or product, which characterise its position in the market-is considered a useful tool to evaluate the chances of success for this new spectrum usage paradigm. In this work, we present a suitable SWOT analysis for the use of TV white spaces considering three different reference scenarios in the European context: spectrum of commons, secondary spectrum market and prioritised services public safety.Copyright © 2013 John Wiley & Sons, Ltd.

Multi-Criteria Assessment of Data Centers Environmental Sustainability

Abstract: The size and capacity of Data Centers (DCs) is growing at a rapid pace to meet the increased demand of data processing and storage capacity requested by a digital information society. Since DCs are infrastructures that have large energy consumption, there is a need to change their design approach to make them more efficient and more environment friendly. This research was motivated by the planning of a new DC in Portugal. It proposes a multi-criteria framework to assess the sustainability of a DC, which includes a new metric to evaluate the DC efficiency taking into account the environmental conditions of the DC location. ELECTRE TRI was chosen for aggregating different metrics concerning the environmental sustainability of a DC into sustainability categories. The evaluation methodology allows some freedom for each DC to place more weight on the aspects in which it is stronger, an analysis facilitated by the IRIS decision support system.

Strictly Non-Blocking All-Optical-Cross-Connect Demonstrator for WDM Wavelength Path Networks

Abstract: In this paper, we assess the design and performances of a strictly non-blocking all-optical cross-connect demonstrator node for WDM wavelength path networks. The all-optical cross-connect (AOXC) prototype was experimentally tested in a small 2 x 2 WDM network with a STM-16 bit stream per channel. The single and cascaded performance of the AOXC was also simulated and its results were validated with the experimental ones.