Backbone networks must be highly reliable. The offered availability can be predicted prior to operation if the stochastic behaviour of network components is known. The aim of this paper is provide information about failures and repairs processes in an operational network. Operational logs from UNINETT’s core network were analysed to obtain distributions of the time between failures and downtime...

In this paper we investigate the noise and crosstalk characteristics of all optical router based on SMZ switch using a numerical model. Two effects, the relative intensity noise (RIN) and channel crosstalk (CXT) that degrade the bit error rate (BER) performance of the router are investigated. Numerical simulation results show that for BER of 10, the sensitivity of the receiver with all-optical ...

A rotor-router walk is a deterministic version of a random walk, in which the walker is routed to each of the neighbouring vertices in some fixed cyclic order. We consider here directed covers of graphs (called also periodic trees) and we study several quantities related to rotor-router walks on directed covers. The quantities under consideration are: order of the rotor-router group, order of t...

2 Studying the Internet Topology (Underlay) 6 2.1 AS-level Topology of the Internet . . . . . . . . . . . . . . . . . . 6 2.1.1 Data Sources for AS-level Topology . . . . . . . . . . . . 7 2.1.2 Characterization Methods for AS-level Topology . . . . . 10 2.1.3 Modeling the AS-level Topology . . . . . . . . . . . . . . 13 2.2 Router-level Topology of the Internet . . . . . . . . . . . . . . . . ...

Network-on-Chips (NoCs) are important components for scalable many-core processors. Because the performance of parallel applications is usually sensitive to latency NoCs, reducing it a primary requirement. In this study, compression router that hides (de)compression-operation delay proposed. The (de)compresses contents incoming packet before switch arbitration completed, thus shortening length ...

We demonstrate IP fast reroute using a recently proposed method called Relaxed Multiple Routing Configurations. The demo comprises a small network of Linux routers, where the effect of network failures can be observed on real-time applications with and without IP fast reroute in effect.

As the Internet represents a key social infrastructure, its reliability is essential if we are to survive failures. Physical connectivity of networks is also essential as it characterizes reliability. There are collaboration structures, which are topological structures where two or more nodes are connected to a node, and collaboration structures are observed in transcriptional regulatory networ...

This paper presents an asynchronous on-chip network router with Quality-of-Service (QoS) support. The router uses a virtual channel architecture with a priority-based scheduler to differentiate between multiple connections with various QoS requirements sharing the same physical channel. A gatelevel prototype of the router has been built and its functionality and performance is evaluated. The si...

Click is a new software architecture for building flexible and configurable routers. A Click router is assembled from packet processing modules called elements. Individual elements implement simple router functions like packet classification, queueing, scheduling, and interfacing with network devices. Complete configurations are built by connecting elements into a graph; packets flow along the ...

In on-board mobile networks, users are connected to a local network that attaches to the Internet via a mobile router and a wireless link. The mobile router has a central role in servicing the mobile network, which makes the security of the mobile router crucial. The security of mobility management protocols used by mobile router, such as Mobile IPv6, have been studied thoroughly. However, the ...