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Telecommunications are evolving towards the unification of services and infrastructures. This unification must be achieved at the highest hierarchical level for a complete synergy of services. Therefore, one of the requirements is a multipurpose backbone network capable of supporting all the current and future services over the same infrastructure, offering high QoS levels. This paper analyzes different possibilities of a future backbone in order to find the best option among the studied ones. This option is a two level structure formed by the combination of N2R and Grid topologies which will achieve high performance levels.
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