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Optical networks are moving from opaque and translucent architectures towards all-optical (transparent) architectures. In translucent architectures a small amount of regeneration (e.g. optical–electronic–optical conversion) is available in the network. The incorporation of the physical impairments in the routing and wavelength assignment (RWA) problem in(More)
Constraint-based routing is an invaluable part of a full-fledged Quality of Service architecture. Unfortunately, QoS routing with multiple additive constraints is known to be a NP-complete problem. Hence, accurate constraint-based routing algorithms with a fast running time are scarce, perhaps even non-existent. The need for such algorithms has resulted in(More)
Nanonetworks will enable advanced applications of nanotechnology in the biomedical, industrial, environmental and military fields, by allowing integrated nano-devices to communicate and to share information. Due to the expectedly very high density of nano-devices in nanonetworks, novel Medium Access Control (MAC) protocols are needed to regulate the access(More)
This paper deals with the fundamentals and current standardization efforts for IEEE 802.17 RPR (Resilient Packet Ring). Its special resilience features make this technology robust against outages of the network infrastructure. The goals of this paper are threefold. Firstly, the fundamentals of RPR and the standardization process carried out under the(More)
Monitoring and mining real-time network data streams is crucial for managing and operating data networks. The information that network operators desire to extract from the network traffic is of different size, granularity and accuracy depending on the measurement task (e.g., relevant data for capacity planning and intrusion detection are very different). To(More)
House Gases (GHG) emissions of network infrastructures are becoming major issues in the Information and Communication Society (ICS). Current optical network infrastructures (routers, switches, line cards, signal regenerators, optical amplifiers, etc.) have reached huge bandwidth capacity but the development has not been compensated adequately as for their(More)
Power management strategies that allow network infrastructures to achieve advanced functionalities with limited energy budget are expected to induce significant cost savings and positive effects on the environment, reducing Green House Gases (GHG) emissions. Power consumption can be drastically reduced on individual network elements by temporarily switching(More)
Keywords: Green networks Cross-layer optimizations Energy consumption GHG emissions a b s t r a c t Power demand in networking equipment is expected to become a main limiting factor and hence a fundamental challenge to ensure bandwidth scaling in the next generation Inter-net. Environmental effects of human activities, such as CO 2 emissions and the(More)
Sampling techniques are often used for traffic monitoring in high-speed links in order to avoid saturation of network resources. Although there is a wide existing research dealing with anomaly detection , few studies analyzed the impact of sampling on the performance of portscan detection algorithms. In this paper, we performed several experiments on two(More)