Fibre optic interconnecting devices and passive components. Performance standard - Single-mode fibre, plug style fixed attenuators for category U. Uncontrolled environment1 Scope This part of IEC 61753 contains the minimum initial test and measurement requirements and severities which a fibre optic attenuator satisfies in order to be categorized as meeting the requirements of single mode fibre, plug style fixed attenuator devices used in uncontrolled environments. Optical performances specified in this standard relate to plug style configurations optical attenuators only.

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as described in PD IEC TR 61850-90-12

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Figure 3 has been updated to include reference dimensions and dimensional format changes