1 Scope
This part of IEC 61753 contains the minimum initial performance, test and measurement requirements and severities
which a fibre optic pigtailed 1 490 / 1 550 nm downstream and 1 310 nm upstream wide
wavelength division multiplexing (WWDM) passive optical network (PON) device must
satisfy in order to be categorized as meeting the requirements of category C (controlled
environments), as defined in Annex A of IEC 61753‑1.
Annex B of this standard provides information concerning the function of the 1 490 / 1 550 nm
downstream and 1 310 nm upstream WWDM.