DAVID (Data And Voice Integration over D-WDM) is a research project sponsored by the European Community aimed at the design of an optical packet-switched network for the transport of IP traffic. The network has a two level hierarchical structure, with a backbone of optical packet routers interconnected in a mesh, and metropolitan areas served by sets of optical rings connected to the backbone t...

Network security problems have been well known and addressed in the application, transport, or network layers. However, the Data Link Layer (Layer 2) security has not been adequately addressed yet. To secure Local or Metropolitan Area Networks, the IEEE 802.1AE Media Access Control (MAC) Security Task Group has proposed the IEEE P802.1AE Standard for Local and Metropolitan Area Networks: MAC Se...

The Israeli network converted to using a Metropolitan Area Network back in February 1994. This MAN network provides coverage over 250 kilometers and 3 major cities in Israel. The seven Israeli universities use Ethernet ports to the MAN running at 10 Mbit/s. This paper describes the lessons learned from running such a nationwide Ethernet netwo::k.

Abstract: We present an overview of the IEEE 802.17 Resilient Packet Ring (RPR) protocol standard for metropolitan area networks. We discuss the main characteristics of the protocol and the main drivers for its development. We outline various aspects of the protocol: architecture and operation principles, physical layer, packet formats, the MAC protocol and its fairness, protection switching an...

An urban microeconomic model of households evolving in a 2D cellular automata allows to simulate the growth of a metropolitan area where land is devoted to housing, road network and agricultural/green areas. This system is self-organised: based on individualistic decisions of economic agents who compete on the land market, the model generates a metropolitan area with houses, roads, and agricult...

Single-hop wavelength division multiplexing (WDM) optical ring networks operating in packet mode are a promising architecture for the design of innovate Metropolitan Area Networks (MANs). They allow a cost-effective design, with a good combination of optical and electronic technologies, while supporting features like restoration and reconfiguration that are essential in any metropolitan scenari...

The Metropolitan Seoul Subway system, consisting of 380 stations, provides the major transportation mode in the metropolitan Seoul area. Focusing on the network structure, we analyze statistical properties and topological consequences of the subway system. We further study the passenger flows on the system, and find that the flow weight distribution exhibits a power-law behavior. In addition, t...

Single-hop wavelength division multiplexing (WDM) ring networks operating in packet mode are a promising architecture for the design of innovate Metropolitan Area Networks. They allow a cost-effective design, with a good combination of optical and electronic technologies, while supporting features like restoration and reconfiguration that are essential in any metropolitan scenario. In this arti...