This paper presents a method for constructing logical topology in multi-hop WDM networks hierarchically. Our logical topology can be built over WDM ring networks with only three ADMs (Add-Drop Multiplexers) and transceivers per node. We aim to realize low-cost WDMs that can be deployed for MANs and LANs. Due to well constructed hierarchical topology, both the maximum distance between two nodes ...

Due to the popularity of the IEEE 802.11-based LANs and fast development of the IEEE 802.16e MANs, we can expect a heterogeneous network consisting of 802.11-based and 802.16e networks in the near future. In such an environment, heterogeneous handoff is possible. How to keep guaranteeing the handoff connection its QoS demand, and in the meantime, avoid impacting on other connections is a challe...

IP has become the dominant networking paradigm for the present century. The evolution towards an all-IP core network infrastructure continues, with an enriched IP layer often implementing the networking functionalities directly on top of WDM (Wave Division Multiplexed) links. Furthermore, IP over switched 1/10 GigaEthernet is replacing the traditional, relatively slow-speed, access technologies...

F. Bodin, P. Boucaud, N. Cabibbo, F. Calvayrac, M. Della Morte , R. De Pietri P. De Riso, F. Di Carlo, F. Di Renzo, W. Errico, R. Frezzotti, U. Gensch , T. Giorgino , M. Guagnelli, N. Hervé, H. Kaldass , A. Lonardo, M. Lukyanov , G. Magazzú, J. Micheli, V. Morénas L. Mori, F. Palombi, N. Paschedag, O. Péne, R. Petronzio, D. Pleiter, F. Rapuano, D. Rossetti, L. Sartori, H. Simma , F. Schifano, R...

This paper considers the dimensioning of the traffic shaping buffer in an Interworking Unit used to interconnect DQDB based MANs over a broadband ATM network. The first part of the paper presents an exact solution for the cell loss probability in the shaper, using an (M/D/1)/D/1/K queueing model. The second part of the paper examines the suitability of such Poissonian arrival assumptions, first...

The challenge to provide seamless mobility in the near future emerges as a key topic in various standardization bodies. This includes first of all the support of seamless handover between homogeneous networks. Distinct technologies — such as IEEE 802.11WLANs (Wi-Fi) and IEEE 802.16 MANs (WiMAX)—have recently augmented such support to existing standards to enable seamless homogeneous handover. C...

The development of teleworking relies heavily on telecommunications infrastructure. In particular, fiber optic networks for high speed networking and various wireless standards (IEEE 802.1x) lead to extensions of fixed networks. Moreover, Private Branch Exchanges (PBXs) with the introduction of IP technology are being transformed to universal access platforms for corporations and organizations....

IEEE 802.6 metropolitan area networks (MANs) provide an efficient architecture for supporting wireless personal communication services (PCSs) over metropolitan areas by interconnecting wireless base stations into personal communication networks (PCNs). They also serve as peripheral gathering networks to transport PCS traffic over a wide area broadband integrated services digital network employi...

Grid computing and infraestructure is being widely deployed in research, commercial and educational environments with the intention of taking advantage of the big amount of computers interconnected in campuses and enterprises. These computers, besides of being connected through LANs and MANs, have a huge amount of resources (CPU time, CPU power, bandwidth, graphical processors, etc) that may be...