ABSTRACT
A short survey of the generations of DFN nation-wide research and education networks, beginning 1990 with the X.25 network and leading to G-WiN (Gigabit-Wissenschaftsnetz) in 2000 is given. The latter is described in some detail, as to structure, technology and usage of the network. The technology and market prospects led to the preparation of a new network, the X-WiN, to start by 2006. For this network, more flexibility in performance, structure, technology, and reliability is required. Special provisions for mass data transport, real-time multi-media and virtual private networks are necessary. A thorough analysis of the market in 2004 confirmed the availability of a broad and qualified spectrum of technology and services to build a network with the required flexibility. In a two-phase call-for-tender process, contracts for fibre, DWDM equipment and other services were organised. A new charging scheme was established by the DFN association. The network topology and the capacity assignment were determined by mathematical optimization, based on available fibres and channels including their capacity and price. Particular and adaptable solutions for the increase of access availability were found. The network deployment is described, the benefit of X-WiN for the user and future challenges are outlined.
© Copyright by K.G. Saur Verlag 2006
