Energy efficiency and the minimization of capital expenditures (CAPEX) for network equipment are studied for two network architectures: IP over WDM and IP over OTN over WDM. Case study results from mixed integer linear programming (MILP) formulations indicate that a CAPEX optimized network yields solutions having minimum energy consumption for both architectures. However, it is shown that the most cost efficient architecture is not always the least energy consuming. We quantify the occurring tradeoff and observe that network equipment CAPEX are dominating in terms of cost. Additionally, it is observed that the relative power contribution of different network layers is independent of the average inter-node traffic demand for both studied architectures.
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机译：为两个网络架构研究了网络设备的能源效率和资本支出最小化（CAPEX）：WDM上的IP和IP OVER OVM。混合整数线性编程（MILP）配方的案例研究结果表明，资本资本优化网络产生了对两个架构的最小能耗的解决方案。但是，结果表明，最具成本效益的架构并不总是最少的能耗。我们量化了发生的权衡，并观察到网络设备资本支配在成本方面是主导的。另外，观察到，不同网络层的相对功率贡献与研究的架构的平均节点间业务需求无关。
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