IEC 62149-5:20 20 RLV包含官方IEC国际标准及其红线版本。Redline版本不是官方文档，它只有英文版本，为您提供了一种快速简单的方法来比较IEC官方标准与其以前版本之间的所有变化。 IEC 62149-5:20 20规定了国际电信联盟（ITU）在ITU-T建议G.983.1中推荐的异步传输模式无源光网络（ATM-PON）系统收发器模块的性能。本第三版取消并取代2009年出版的第二版，构成技术修订。与上一版相比，此版本包括以下重大技术变更: -删除第4条中对类型的描述； -更新了参考文件的标题。

IEC 62149-5:2020 RLV contains both the official IEC International Standard and its Redline version. The Redline version is not an official document, it is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.

IEC 62149-5:2020 specifies performance on the transceiver modules for asynchronous-transfer-mode passive optical network (ATM-PON) systems recommended by the International Telecommunication Union (ITU) in ITU-T Recommendation G.983.1. This third edition cancels and replaces the second edition published in 2009 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- description of types in Clause 4 has been removed;
- titles of reference documents have been updated.