OTIS (Optical Transpose Interconnection System) optoelectronic architecture is an attractive high-speed interconnection network. As a continuation for the research work performed on OTIS, this paper investigates broadcast and global combine communication operations on the promising all-port wormhole-routed OTIS-Mesh using the Extended Dominating Node (EDN) approach, referred to as EDN-OTIS-Mesh. The performance of broadcast and global combine operations is evaluated, both analytically and by simulation, in terms of the number of communication steps, latency, and latency improvement. A comparative study is conducted among three interconnection networks' architectures: the single-port wormhole-routed OTIS-Mesh, allport wormhole-routed OTIS-Mesh, and all-port wormholerouted EDN-OTIS-Mesh. The obtained analytical and simulation results show that the broadcast and global combine operations on all-port EDN-OTIS-Mesh significantly outperform the single-port and all-port OTIS-Mesh.
Enterprise data backup is always a mission critical as well as resource straining operation. In the light of recent surge in near peta-byte databases universities are particularly searching for scalable solutions. Most world universities today are cluster connected via advanced research and education networks-known as RENs. This creates an excellent opportunity to build scalable distributed data-backup and recovery solutions by using each other's facilities. In this paper we present a network study for a distributed data-backup system which uses cloud like virtualization for almost indestructible data backup.
An exuberant space age is emergent, which is likely to see many compact yet innovative explorations much beyond imagined in the past requiring a reusable and sharable space communication infrastructure. Currently proposed space communication architectures mainly suffer from three design drawbacks high cost, narrowed scale and lack of concise geographical organization. Therefore, there has been a renewed interest for developing a new generation of architectures addressing these design drawbacks. Recently, a set of architectures have been proposed by NASA, JPL, CCSDS and BBN contributing towards the architectural design of the next generation space networks. However, it is not pretty simple proposals to determine there completeness, cost-efficiency and their capability to address varied communication and challenges of space environments. In this paper we backward one step, we describe a holistic framework for space communication. We identify the major constraints of space environment imposed by the galactic geography. We also outline a sufficiently complete design space of the plausible range of communication modalities this age of space communication might require. These requirements are based on the path and link concurrency and non concurrency based classification including edge and core mobility, link intermittency, and schedulability. Moreover, we survey three leading architectures namely OMNI, CCSDS and SpaceVPN. We show their extent of completeness, strengths, weaknesses, and what communication modalities they support and what they do not. In was shown that OMNI architecture will have the potential to serve near space mission missions, while SpaceVPN will be the architecture of next space age serving large scale deep space missions.
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