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In this paper we integrate the energy models of all the components of the data link layer of a wireless sensor network into a single framework, which interacts with the abstracted models of the network layer, the physical layer, and the channel. Such a framework enables intra layer and cross layer optimization. By identifying the important design parameters, it provides the venues and guidelines for energy' reduction and design improvement, as demonstrated in the paper. The validity of the models is verified using OMNET++ network simulations.