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In this paper, we present a scheme for dynamic resource management using heterogeneous traffic descriptors. A simple priority class scheme to support basic QoS at the DWDM layer in optical networks is devised. Unlike existing mechanisms that depend on buffer management and scheduling algorithms, our mechanism does not require any electronic buffering in the intermediate DWDM network nodes, which is greatly desired. The proposed scheme assigns different delay times to service classes in order to isolate higher priority classes from lower priority classes. Finally, we develop a traffic model and an allocation wavelength model, and analyze the blocking probability of each class.