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 will
satisfy in order to be categorized as meeting the requirements of category C (indoor
controlled environment), as defined in IEC 61753‑1:2018, Annex A. WWDM is defined in IEC 62074‑1. Annex B gives general information for these PON WWDM devices.

