IEC 62150-2:2010 specifies testing and measuring procedures for fibre optic transceivers for asynchronous-transfer-mode passive optical network (ATM-PON) systems recommended by ITU-T G.983.1. These testing procedures correspond to methods of examining whether the transceivers satisfy the performance specifications defined in IEC 62149-5. The significant technical change to the first edition is: The power meter requires higher saturation power than 2 x Psubmean/sub for Psubave/sub measurement in Clause 7.3.3.