IEC 60793-2-50:2018作为IEC 60793-2-50:2018 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60793-2-50:2018适用于B-652、B-653、B-654、B-655、B 656和B-657类光纤。表1中示出了IEC名称与ITU-T名称的连接图。这些光纤用于或可以结合在信息传输设备和光缆中。？三种类型的要求适用于这些纤维: ？IEC 60793-2中定义的一般要求； ？本文件涵盖的B类单模光纤共有的具体要求，在第5条中给出； ？适用于附件A至F中定义的单个纤维类别或特定应用的特殊要求。对于某些光纤类别（在相关系列规格中显示），存在基于传输属性规格差异来区分的子类别。这些子类别的名称记录在单个系列质量标准中。 第六版取消并取代2015年出版的第五版。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)引入与ITU T建议G.652、G.653、G.654、G.655、G.656和G.657更匹配的修订命名约定。本文档范围内概述了这些更改以及新名称的交叉引用表。根据新的命名，对附件进行了重新排列，以提高清晰度；b)关于200微米涂层单模光纤要求的进一步细节； c)与2016年11月发布的以下ITU-T建议协调:G.652、G.654、G.657，包括修订的色散规范、这些光纤类别的新类别和新应用空间； d)在附件A至F的标题中增加了纤维类型的描述。 关键词:信息传输设备,光纤光缆

IEC 60793-2-50:2018 is available as IEC 60793-2-50:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60793-2-50: 2018 is applicable to optical fibre categories B-652, B-653, B-654, B-655, B 656 and B-657. A map illustrating the connection of IEC designations to ITU-T designations is shown in Table 1. These fibres are used or can be incorporated in information transmission equipment and optical fibre cables.？ Three types of requirements apply to these fibres:
？ general requirements, as defined in IEC 60793-2;
？ specific requirements common to the class B single-mode fibres covered in this document and which are given in Clause 5;
？ particular requirements applicable to individual fibre categories or specific applications, which are defined in Annexes A to F.
For some fibre categories (shown in the relevant family specifications), there are sub-categories that are distinguished on the basis of difference in transmission attribute specifications. The designations for these sub-categories are documented in the individual family specifications.
The sixth edition cancels and replaces the fifth edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Introduction of a revised naming convention which better matches with those found in ITU T Recommendations G.652, G.653, G.654, G.655, G.656, and G.657. These changes are outlined in the scope of this document along with a cross reference table for the new names. Annexes have been rearranged to improve clarity based on the new naming;
b) Further details on the requirements for 200 micron coated single-mode fibre;
c) Harmonization with the following ITU-T Recommendations published in November 2016: G.652, G.654, G.657 including revised chromatic dispersion specifications, new categories and new application spaces for these fibre categories;
d) Descriptions of fibre types have been added to the titles of Annexes A to F.
Keywords: information transmission equipment, optical fibre cables