NF C93-464-3-108-2015 电子设备用机械结构. 482,6 mm (19 in) 系列机械结构尺寸. 第3-108部分: R类插箱和插件尺寸
Mechanical structures for electronic equipment - Dimensions of mechanical structures of the 482,6 mm (19 in) series - Part 3-108 : dimensions of R-type subracks and plug-in units