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
8.2 Equipment Configuration 8.2.1 Integrated Configuration Table 11 provides comparison of requirements for configuration of IP equipments. In particular, the recommendation for baseline, auxiliary configurations and the restriction on change of configuration during measurements is outlined. Table 11: Comparison of requirements for test and measurement of IP equipments in integrated configuration ETSI [1] ITU [2] ATIS [3] ECR [4] Base Configuration: ATIS Base Configuration: ATIS Base Configuration: All testing shall be performed on a fully loaded chassis as defined by the referenced application Base Configuration: The SUT is configured according to class requirements and offered the load as defined in the class requirements (Appendix B of [4]). Typically, the SUT is a reference system fully outfitted with hardware and software suitable for class requirements. Redundancy and auxiliary configuration: Equipment shall be tested with all redundancies in place and corresponding functions shall be activated, the redundancy modules including but not limited to power supply unit redundancy, Main Processing Unit (MPU), redundancy, etc. Redundancy and auxiliary configuration: ATIS Redundancy and auxiliary configuration: If there are customer specific applications defining redundancy requirements, they should be clearly documents in the report. Redundancy and auxiliary configuration: For the purposes of testing, all redundant components (fabric, routing engines, power supplies, memory cards, etc.) should be present in the system Other configurations: For the equipment supporting PoE power supply, the PoE power supply modules shall be disabled. No PoE power is supplied. For ports, 10 Km optical modules need to be used for FE, GE and 10 GE ports; for the electrical and optical multiplexing ports, the electrical ports need to be tested. The capacity of the Other configurations: ATIS Other configurations: All ports shall be in an active state and passing or ready to pass traffic. System software shall be properly configured prior to the test and all the necessary HW components installed. HW and SW shall be representative of a production unit. Other configurations: For the purposes of public testing, all platforms should be tested with publicly available (shipping) software images, publicly available (shipping) board hardware revisions and fully documented and supported configurations.