IEC 61753-021-06:20 23定义了端接为尾纤或跳线的单模光纤连接器满足的最低初始测试和测量要求以及严重性，以便被归类为符合IEC标准类别OP+（扩展室外保护环境），如IEC 61753-1所定义。如果对端接为OP+HD类别的尾纤或跳线的连接器进行了测试，并且产品通过，则产品将自动合格或分类为符合OP+类别的IEC标准。如果对端接为OP+类尾纤或跳线的连接器进行测试，并且产品通过，则产品将自动合格或分类为符合IEC OP类和C类标准。本第一版取消并取代IEC 61753第一版-021-6发表于2007年。本版构成技术修订版。本版本包括以下与IEC 61753-021-6:20 07相关的重大技术变更: a)根据IEC 61753-1:20 18更新环境类别（从O至OP+）、测试及其严重性； b)删除版权声明，因为不再需要它； c)更改了标题和范围，取消了对衰减和回波损耗等级的限制； d)改变了各种测试中使用的不同类型测试样品（尾纤测试样品和跳线测试样品）的术语和定义，以避免混淆； e)删除了小型(SFF)连接器的术语和定义，因为该术语和定义不再在文档中使用； f)根据IEC 60793-2-50更新了光纤命名约定:并增加了B-657纤维； g)增加了IEC 61753-1中定义的所有衰减和回波损耗等级； h)取消了静态侧载试验； i)消除了顺序执行所有测试以与其他性能标准保持一致的需要； j)增加了矩形套圈连接器的规定； k)增加了附件B，用于目视检查加固电缆的外部电缆护套移动，作为温度变化、电缆保持力和应变消除试验弯曲的附加要求。

IEC 61753-021-06:2023 defines the minimum initial test and measurement requirements and severities which single-mode fibre optic connectors terminated as a pigtail or a patchcord satisfy in order to be categorised as meeting the IEC standard category OP+ (extended outdoor protected environment), as defined in IEC 61753-1. If tests were performed on the connectors terminated as pigtails or patchcords for category OP+HD and the product passed, the product will be automatically qualified or categorized as meeting the IEC standard for category OP+. If tests are performed on the connectors terminated as pigtails or patchcords for category OP+, and the product passes, the product will be automatically qualified or categorized as meeting the IEC standard for categories OP and C. This first edition cancels and replaces the first edition of IEC 61753-021-6 published in 2007. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61753-021-6:2007:
a) updated environmental category (from O to OP+), tests and their severities according to IEC 61753-1:2018;
b) removed the copyright notice as it is no longer needed;
c) changed title and scope to remove restrictions on attenuation and return loss grades;
d) changed the term and definitions of the different types of test samples (pigtail test samples and patchcord test samples) used in the various tests to avoid confusion;
e) removed the term and definition for small form factor (SFF) connectors as it is no longer used in the document;
f) updated fibre naming conventions according to IEC 60793-2-50: and added provisions for B-657 fibres;
g) added all the attenuation and return loss grades defined in IEC 61753-1;
h) removed the static side load test;
i) removed the need to perform all tests sequentially to align with other performance standards;
j) added provisions for rectangular ferrule connectors;
k) added Annex B for visual examination of the outer cable sheath movement of reinforced cables as an additional requirement for change of temperature, cable retention and flexing of the strain relief tests.