IEC 63267-2-2:20 24定义了用于参考连接的光学接口的尺寸限制，以满足非成角度和成角度抛光多模参考连接器的光纤到光纤互连的特定要求，这些参考连接器旨在用于现场或工厂中的衰减测量。本文档中定义了几个等级的参考连接。 多模参考连接仅在850 nm频段终止于受限的IEC 60793-2-10 A1-OM2b至A1-OM5b光纤。 已经开发了指定参考连接的几何尺寸和公差，主要是为了限制多组两个参考连接器之间的测量衰减的变化，并且因此限制当与现场或工厂中的连接器配合时随机选择的参考连接器之间的测量衰减的变化。

IEC 63267-2-2:2024 defines the dimensional limits of an optical interface for reference connections necessary to meet specific requirements for fibre-to-fibre interconnection of non-angled and angled polished multimode reference connectors intended to be used for attenuation measurements in the field or factory. Several grades of reference connections are defined in this document.
The multimode reference connections are terminated to restricted IEC 60793-2-10 A1-OM2b to A1-OM5b fibre at the 850 nm band only.
The geometrical dimensions and tolerances of the specified reference connections have been developed primarily to limit the variation in measured attenuation between multiple sets of two reference connectors, and therefore to limit the variation in measured attenuation between randomly chosen reference connectors when mated with connectors in the field or factory.