Browsing by Author "Campanella, S. Joseph"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item Faster than Fiber: Advantages and Challenges of Leo Communications Satellite Systems(1995) Campanella, S. Joseph; Kirkwood, Timothy J.; ISR; CSHCNLow Earth Orbit (LEO) communications satellite systems are emerging as attractive alternatives to the Geostationary Earth Orbit (GEO) systems. GEO satellites have largely dominated the commercial and government communications satellite systems for telecommunications services since the early 1960's. A principal driver behind the move to LEO satellites is the competition to long propagation delay geostationary orbit satellite systems created by rapid expansion of short propagation delay terrestrial land and undersea fiber optic cable links for national and global connectivity. Communication paths over LEO satellites can have shorter propagation delay than terrestrial fiber. This because the speed of electromagnetic wave propagation via LEO satellites is 50% greater than that of light in fiber optic cable. This fact eliminates the long propagation delay property that has become synonymous with GEO communications satellite system. Other drivers are the use of small portable and hand-held earth terminals and the promise of low launch cost of small satellites to low earth orbits. The paper expands on the properties that promise to make LEO communications satellite systems the choice of the future.Item Hybrid Network Architectures; A Framework for Comparative Analysis(1995) Baras, John S.; Campanella, S. Joseph; Kirkwood, Timothy J.; ISR; CSHCNThe Global Information Infrastructure of the future will include a great variety of heterogeneous, seamlessly interconnected networks. There are strong variety of heterogeneous, seamlessly interconnected networks. There are strong technical and economic reasons predicating the emergence of these hybrid networks which will include many diverse terrestrial (tethered or wireless) and satellite networks in an interoperating configuration. This paper critically analyzes the basis for these new architectures and examines the various possibilities that will emerge in various phases in the future. A summary view is presented for these emerging hybrid architectures, the alternative components and subsystems available and the trade-offs that must be considered. The role of satellites is carefully analyzed and several conclusions are drawn. This paper will present a summary of the work and views of the Center for Satellite and Hybrid Communication Networks todate, in this important area. Specific design and performance evaluation tools being developed will also be described.Item Satellites in the National Information Infrastructure(1995) Kirkwood, Timothy J.; Campanella, S. Joseph; ISR; CSHCNThe public discussion on the National Information Infrastructure (NII) has bee wide ranging and lacking in consensus as to the nature of the proposed NII itself. This paper in acknowledgment of the national policy origins of the NII debate begins with relevant remarks by President Clinton in his State of the Union Address. It defines an initial working definition of the NII based on the President's challenge. It then provides some clarification to the discussion in terms of planning horizon, subscriber transport services and transport media. The working definition is further developed to incorporate the type of traffic the NII will be expected to support following a discussion of an emerging desktop computing imperative. From this implications are drawn as to the feasibility of the so called fiber solution and an argument made that in the evolution of the current infrastructure to the future NII satellites offer the best solution for a timely manifestation of the vision.