IEC 61076-3-124:2019涵盖了用于频率高达500 MHz的数据传输的10路、屏蔽、自由和固定矩形连接器，并分别规定了常见尺寸、机械、电气和传输特性以及环境要求以及测试规范。 鉴于预期用途不同，本文档中涵盖的连接器提供了三种编码，仅偏振键和键槽的位置不同: A型和C型连接器适用于10/100 Mbit/s以及1/2、5/5/10 Gbit/s以太网通信。 B型连接器适用于所有其他非以太网应用，如信令、串行或其他工业总线通信系统。 -A-编码:用作偏振键和键槽系统的45°切割角位于公固定连接器的左下角上(从配合面观察)(图5a、5b)。-B-编码:45°切割拐角位于公固定连接器的左上角(图5c、5d)。 -C编码:存在位于左上角和左下角的两个45°角(图5e、5f)。 -在本文件中，三个编码A、B和C被指定为“类型A”、“类型B”和“类型C”。 关键词:矩形连接器，10路屏蔽，自由和固定连接器，I/O和数据传输，频率高达500 MHz

IEC 61076-3-124:2019 covers 10-way, shielded, free and fixed rectangular connectors for data transmission with frequencies up to 500 MHz and specifies the common dimensions, mechanical, electrical and transmission characteristics and environmental requirements as well as test specifications respectively.
Connectors covered in this document are provided in three codings that differ only for the position of the polarization key and keyway, in view of their differently intended use:
Connectors type A and C are intended for 10/100 Mbit/s as well as for 1/ 2,5 / 5 /10 Gbit/s Ethernet communication.
Connectors type B are intended for all other non-Ethernet applications such as signalling, serial or other industrial bus communication systems.
- A-coding: The 45° cut corner used as polarization key and keyway system is located on the lower left corner of the male fixed connector (viewed from mating face) (Figures 5a, 5b).
- B-coding: The 45° cut corner is located on the upper left corner of the male fixed connector (Figures 5c, 5d).
- C-coding: There are two 45° corners located at the upper left and lower left corner (Figures 5e, 5f).
- In this document, the three codings, A, B, and C are designated as “Type A”, “Type B” and “Type C”.
Key words: Rectangular Connectors, 10 Way Shielded, Free and Fixed Connectors, I/O and Data Transmission, Frequencies up to 500 MHz