此处规定的性能要求包括连接至连接器插头的连接器插头后壳。这种类型的连接器插头固定在背板印刷电路板（PCB）上，固定在主板上，或直接安装在电路卡机架的后缘上，并与安装在电路卡或PCB后缘上的连接器插座匹配。此连接器插头后壳不包含限制移动、定位和扭曲的功能，也不包含捕获单光纤电缆的功能。此外，没有防止各种环境渗透的功能。

The performance requirements specified herein cover a connector plug backshell that is affixed to the connector plug. This type connector plug is affixed to a backplane printed circuit board (PCB), affixed to a motherboard, or mounted directly onto the back edge of a circuit card rack and is mated to a connector receptacle mounted on the back edge of a circuit card or PCB. This connector plug backshell does not incorporate features to restrict movement, position, and twist or a feature to capture the single fiber cables. Also, there are no features to prevent the penetration of various environments.