This part of IEC 61753 contains the minimum initial performance@ test and measurement requirements and severities which a fibre optic pigtailed 1 310 nm upstream and 1 490 nm downstream wide wavelength division multiplexing (WWDM) passive optical network (PON) device must satisfy in order to be categorized as meeting the requirements of category O (uncontrolled environments)@ as defined in Annex A of IEC 61753-1. Annex B of this standard provides information concerning the function of the 1 310 nm upstream and 1 490 nm downstream WWDM.