Effects of bursty traffic in service differentiated Optical Packet Switched networks

Service differentiation is a crucial issue in the next-generation Optical Packet Switched networks. In this paper we examine how bursty traffic influences the performance of a service differentiated Optical Packet Switched network. By using time-continuous Markov chains, we derive explicit results for the packet loss rates in the case of a bursty hyper-exponential arrival process. Results indicate that the performance is degraded as the burstiness of the arrival process increases

Reconfigurable interconnection in optical switching fabrics with wavelength converters

The high degree of flexibility expected from future networks can be provided by switch architectures which combine a wide range of functionalities by operating in different dimensions, namely time, space, wavelength, suitably explloited by reconfiguration capability. Architectures design are here proposed based on programmable optical backplane to implement reconfigurable interconnections in switching fabrics with wavelength converters. Complexity comparisons are presented and cost of programmability evaluated

Cost and Energy Efficient Programmable Architecture for Integrated Hybrid Optical Switching

Optical switching architecture with integrated circuit and packet switching capabilities is proposed based on programmable interconnection matrix to meet the flexibility requirements of future communication infrastructures. The proposed switch architecture is thought to be implemented using off-the-shelf components as a possible migration solution from electronic to optical technology in limited complexity and energy efficiency perspective. The solution adopts integrated hybrid multiplexing of guaranteed and best effort packets at the wavelength level. Comparison with longer term all-optical solutions are presented regarding complexity and power consumption to show how modular architectures are able to achieve cost and energy efficiency

Protecting PONs: A failure impact, availability and cost perspective based on a geometric model

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Influence of Software and Hardware Failures with Imperfect Fault Coverage on PONs OPEX

Passive Optical Networks (PONs) are one of the preferred technologies to deploy broadband access networks. As time passes, end users presuppose network connectivity to be always available, and expect PONs to be highly dependable. Yet operators, from an economic view, are interested in the costs related to failures. Thus, PONs dependability and associated costs have been extensively studied, but only focusing on hardware failures. Contrarily, this paper performs a thorough analysis of the impact of software failures in failure-related costs. Based on real empirical data, software failures are thoroughly characterized and classified in four different categories according to their severity. Also, the effect of software failures on the behavior of PON’s fiber protection and recovery mechanisms is detailed. Software failures are included into a Markov cost model, implementing a comprehensive cost framework. This way, the dependability-related costs of PONs are analyzed, accounting for hardware and software failures, as well as for the consequences of software failures on well-known PON protection mechanisms. Moreover, how the testing phase duration and user profile (residential or business) impact these costs is pinpointed

Failure Impact, Availability and Cost Analysis of PONs Based on a Network Geometric Model

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