This part of IEC 61753 contains the minimum requirements and severities which multimode fibre optic connectors terminated as a pigtail and a patchcord need to meet in order to be categorized as meeting the IEC standard category OP+ HD 71 (Extended outdoor protected environment with additional heat dissipation), as defined in IEC 61753-1, If tests are performed on the connectors terminated as pigtails or patchcords for category OP+ HD 73 , and the product passes, the product will be automatically qualified or categorized as meeting the IEC standard for categories OP+, OP, OPHD, C and CH 75.
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