DIN EN 61753-051-3-2013 光纤互连器件和无源元件. 性能标准. 第051-3部分:U类单模光纤插接式固定衰减器. 非受控环境 (IEC 61753-051-3-2013); 德文版本EN 61753-051-3-2013
Fibre optic interconnecting devices and passive components - Performance standard - Part 051-3: Single-mode fibre, plug style fixed attenuators for category U - Uncontrolled environment (IEC 61753-051-3:2013); German version EN 61753-051-3:2013