EXECUTIVE SUMMARY This standard identifies sound power as the preferred method of measuring the emission of acoustic noise from telecommunications equipment. The main focus is to use sound power to gain repeatability and accuracy over sound pressure methods. This standard will also provide the emission limits for the temperature-controlled environment (i.e.@ Central Office@ data centers) for the North American environment. The standards used to determine the sound power measurement include ANSI S12.10 [3]@ ANSI S12.12 [4]@ ANSI S12.54 [5]@ and ETSI 300 753 [1]. These documents set forth testing methodologies for accurate measuring@ reporting@ and verification of the noise emission of telecommunications equipment. The A-weighted sound power level in units of decibels is used to quantify acoustic noise emission. Application This standard applies only to the airborne acoustic noise generated by equipment during operation under the conditions defined in this standard. The noise limit for equipment under maintenance conditions (i.e.@ with door opened) is not defined or measured. The noise limit while operating at maximum fan speed is not defined@ but is measured. The limits also do not apply to equipment features that produce sound as an intentional aspect of their operation@ such as alarm signals@ attention signals@ or speech signals. This standard covers equipment intended to be installed in a line-up or as stand-alone pieces of equipment.