本文规定的性能要求包括固定在矩形连接器插头前表面上的定位套筒护圈（ASR）。连接器插头是与安装在电路卡或印刷电路板（PCB）上的连接器插座匹配的类型。连接器插头与连接器插座的匹配在PCB插入背板或机架后或插入时完成。本规范表中的不同矩形ASR配置包括固定在矩形连接器插头上的配置。该ASR配置适用于与PCB前缘（MIL-PRF-64266/25）上的连接器插座匹配的连接器插头类型。这种ASR配置同样适用于安装在背板（MIL-PRF-64266/23）中的矩形连接器插头。

The performance requirements specified herein cover an Alignment Sleeve Retainer (ASR) that is affixed to the front surface of a rectangular connector plug. The connector plug is the type that is mated with a connector receptacle mounted onto a circuit card or printed circuit board (PCB). Mating of the connector plug to the connector receptacle is accomplished after or while the PCB is inserted into the backplane or rack. The different rectangular ASR configurations in this specification sheet cover those affixed to rectangular connector plugs. This ASR configuration is for the connector plug type that mates with connector receptacles on the PCB front edge (MIL-PRF-64266/25). This same ASR configuration is for the rectangular connector plug mounted in the backplane (MIL-PRF-64266/23).