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In this paper, we study the power efficiency and delay performance of theIEEE 802.3az Energy Efficient Ethernet (EEE) protocol. A new approach isproposed to analyze the M/G/1 queue with the vacation time that is governed bythe arrival process and the parameter {\tau} and N of the BTR strategy. Our keyidea is to establish the connection between the vacation time and the arrivalprocess to account for their dependency. We first derive the distribution ofthe number of arrivals during a vacation time based on an event tree of the BTRstrategy, from which we obtain the mean vacation time and the power efficiency.Next, from the condition on the number of arrivals at the end of a vacationperiod, we derive a generalized P-K formula of the mean delay for EEE systems,and prove that the classical P-K formula of the vacation model is only aspecial case when the vacation time is independent of the arrival process. Ouranalysis demonstrates that the {\tau} policy and N policy of the BTR strategyare compensating each other. The {\tau} policy ensures the frame delay isbounded when the traffic load is light, while the N policy ensures the queuelength at the end of vacation is bounded when the traffic load is heavy. Theseresults, in turn, provide the rules to select appropriate {\tau} and N. Ouranalytical results are confirmed by simulations.

Power Efficiency and Delay Tradeoff of 10GBase-T Energy Efficient Ethernet Protocol