DIN EN 61753-021-3-2013 纤维光学互连器件和无源元件. 性能标准. 第021-3部分: U类单模纤维光学连接器. 非受控环境(IEC 61753-021-3-2012); 德文版本EN 61753-021-3-2013
Fibre optic interconnecting devices and passive components - Performance standard - Part 021-3: Single-mode fibre optic connectors for category U - Uncontrolled environment (IEC 61753-021-3:2012); German version EN 61753-021-3:2013