This document provides the methodology to be used by vendors and third party independent laboratories in the formation of a telecommunications energy efficiency ratio. The requirements and definitions in this document are for the transport and optical access class of products that are deployed in the telecommunications industry. This supplemental standard represents one part of the larger ATIS suite of standards concerning Telecommunications Energy Efficiency (ATIS-0600015). This supplemental standard (ATIS-0600015.02) specifically addresses transport and optical access equipment and is to be used in conjunction with ATIS-0600015. The initial document scope is modest to start with the intention of refining the data to be provided@ the measurement methods@ and the reporting format over time. Purpose This document provides a set of definitions@ requirements@ and guidelines for calculating the Telecommunications Energy Efficiency Ratio (TEER) of a system or network configuration consisting of a given product or group of related or inter-connected products. The document will also provide standardized definitions of transport and optical access interface operational data rates and conditions to be used when calculating the TEER of any given configuration. The test methodology used to measure the equipment input power used as part the TEER calculation is addressed in ATIS-0600015.