IEC 61755-3-2:20 24定义了单模光纤连接器所需的光学接口的尺寸限制，该连接器具有直径为2.5 mm或1.25 mm的圆柱形氧化锆（ZrO2）套圈，以8°角抛光，以满足IEC 61755-2-2中定义的光纤到光纤互连的特定要求。由本标准中规定的材料制成的套圈适用于IEC 61753-1中定义的所有操作服务环境。套圈尺寸和特征包含在IEC 61754系列光纤连接器接口标准中。这第二版取消并取代了2006年出版的第一版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更:a)增加了规范性参考文献； b)引入具有不同光纤芯偏心分布的附加光学接口。光接口标准的前一版本被命名为“变体1:光纤芯轴朝向连接器导向键”。 附加光学接口被命名为“变型2:光纤芯轴不朝向连接器引导键定向”； c)添加了与互操作性相关的声明，其中两种变体在给定的性能等级内保持可互操作，并且完全向后兼容IEC 61755-3-2:20 06； d)为两种变体增加B级和C级接口要求； f)增加平均光纤芯偏心度(平均值)的描述性统计，以描述光纤芯偏心度的分布，以确保互操作性；g)一个新的信息性附件B，用于指导与参考连接器插头配合时的预期衰减； h)新的信息性附件D，提供与有限生产批量大小的平均纤维偏心极限估计相关的指导。

IEC 61755-3-2:2024 defines the dimensional limits of the optical interface that are necessary for single-mode fibre optic connectors with 2,5 mm or 1,25 mm diameter cylindrical zirconia (ZrO2) ferrules polished at an 8° angle to meet the specific requirements for fibre-to-fibre interconnection, as defined in IEC 61755-2-2. Ferrules made from the material specified in this standard are suitable for use in all the operating service environments defined in IEC 61753-1. Ferrule dimensions and features are contained in the IEC 61754 series of fibre optic connector interface standards. This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) normative references have been added;
b) The introduction of an additional optical interface with a different fibre core eccentricity profile. The previous revision of optical interface standard is named "Variant 1: with fibre core axis oriented towards the connector guide key".
The additional optical interface is named "Variant 2: with fibre core axis not oriented towards the connector guide key";
c) statements added related to interoperability, where both variants remain intermateable within a given performance grade and are fully backwards compatible to IEC 61755-3-2:2006;
d) The addition of Grade B and Grade C interface requirements for both variants;
f) The addition of a descriptive statistic for the mean fibre core eccentricity (mean value) to describe the distribution of fibre core eccentricity to ensure interoperability;
g) A new informative Annex B to give guidance on the expected attenuation when mated to a reference connector plug;
h) A new informative Annex D to give guidance related to estimation of mean fibre eccentricity limits for finite production batch sizes.