IEC 61755-3-2:2024定义了单模光纤连接器所需的光学接口尺寸限制，该连接器具有直径为2.5mm或1.25mm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具体要求。由本标准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。 第二版取消并取代了2006年出版的第一版。本版本为技术修订版。与上一版相比，本版包括以下重大技术更改: a） 增加了规范性引用文件； b） 引入具有不同光纤芯偏心率分布的附加光学接口。光学接口标准的上一版名为“变体1:光纤芯轴朝向连接器导向键”。 附加的光学接口名为“变体2:光纤芯轴不朝向连接器导向键”； 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配，并完全向后兼容IEC 61755-3-2:2006； d） 为两种变体增加了B级和C级接口要求； f） 添加平均光纤芯偏心率（平均值）的描述性统计数据，以描述光纤芯偏心度的分布，从而确保互操作性； g） 一个新的信息性附录B，为与参考连接器插头配合时的预期衰减提供指导； h） 一个新的信息性附录D，为有限生产批量的平均纤维偏心极限估算提供指导。

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.