IEC 61753-085-2:2008 contains the minimum initial test and measurement requirements and severities which a fibre optic pigtailed coarse wavelength division multiplexing (CWDM) device needs to satisfy in order to be categorized as meeting the requirements of category C (controlled environments), as defined in Annex A of IEC 61753-1. CWDM is defined in IEC 62074-1.