5 Metric Definition In this section, a detailed comparison of the metrics used to compute the energy efficiency of IP equipments is provided. Specifically, the definition, units of measurement and method of computation are compared. Table 2: Comparison of energy efficiency metrics for IP equipments ETSI [1] ITU [2] ATIS [3] ECR [4] Definition: Definition: Definition: Definition: Energy TEER is defined as a Efficiency ratio of maximum Ratio of demonstrated throughput Equipment ( to weighted power (EEER) is defined as the throughput forwarded by 1 watt, Units: Units : Mbit/ss/W Units: Gbps/Watt Units: Watts/Gbps Gbps/Watt Computation: Computation: Computation: Computation: The weighted is weighted throughput Weighted energy power is consumption = energy consumption (watts) calculated as: is weighted power (energy = maximum throughput consumption rate) (Gbps) achieved in the Where, measurement cycle = Weighted power (a, b, c) = relative weights T50 = Tf * 0.5 : Weight a,b,c = weighting for for utilization levels, where multipliers for T30 = Tf * 0.3 power at each utilization different traffic level T10 = Tf * 0.1 level; () = power measured at The summation E100 = energy consumption respective utilization levels of to equal to (watts) measured during step ,= Power at system () = throughput measured at 1. 2, Test Procedure 1 utilization level respective utilization levels E50 = energy consumption : Total capacity (watts) measured during step of the interfaces for a 3, Test Procedure 1 fixed E30 = energy consumption configuration (watts) measured during step model (the sum 4, Test Procedure 1 of interface bandwidth). E10 = energy consumption (watts) measured during step
5 Metric Definition In this section, a detailed comparison of the metrics used to compute the energy efficiency of IP equipments is provided. Specifically, the definition, units of measurement and method of computation are compared. Table 2: Comparison of energy efficiency metrics for IP equipments ETSI [1] ITU [2] ATIS [3] ECR [4] Definition: Energy Efficiency Ratio of Equipment (EEER) is defined as the throughput forwarded by 1 watt, Definition: Definition: TEER is defined as a ratio of maximum demonstrated throughput ( to weighted power Definition: Units: Gbps/Watt Units : Mbit/ss/W Units: Gbps/Watt Units: Watts/Gbps Computation: The weighted power is calculated as: : Weight multipliers for different traffic level; The summation of to equal to 1. : Total capacity of the interfaces for a fixed configuration model (the sum of interface bandwidth). Computation: is weighted throughput is weighted power (energy consumption rate) (a, b, c) = relative weights for utilization levels, where () = power measured at respective utilization levels () = throughput measured at respective utilization levels Computation: Weighted energy consumption Where, = Weighted power a,b,c = weighting for power at each utilization level ,= Power at system utilization level Computation: = energy consumption (watts) = maximum throughput (Gbps) achieved in the measurement cycle T50 = Tf * 0.5 T30 = Tf * 0.3 T10 = Tf * 0.1 E100 = energy consumption (watts) measured during step 2, Test Procedure 1 E50 = energy consumption (watts) measured during step 3, Test Procedure 1 E30 = energy consumption (watts) measured during step 4, Test Procedure 1 E10 = energy consumption (watts) measured during step
GISFI_GICT_201309397.docx