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This part of IEC 61753 contains the minimum initial test, measurement requirements and severities which a fibre optic 1,31/1,55 μm wide wavelength division multiplexing (WWDM) device satisfies in order to be categorised 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.
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