In this paper we deal with mapping performance-oriented IP services such as Integrated Services (IntServ) or Differentiated Services (DiffServ) onto network performance parameters for cell-switched transport networks, as for example ATM. The impact of translating IP performance parameters into ATM network services is analyzed and the detrimental effects of careless mappings are illustrated. Then, approaches to circumvent these detrimental effects are presented. In general, it is agreed that heterogeneity is a fact for today’s large-scale internetworks, with the global Internet as the most prominent example. Therefore it is also a fact for QoS architectures. Anyway, competition, different strengths and evolution are arguments for heterogeneity with regard to QoS as well.
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