DIN EN 61753-131-3-2011 光导纤维插接元件和无源元件的性能标准.第131-3部分:U类非可控环境中的单模机械式光纤接合.(IEC 61753-131-3-2010);德文版本EN 61753-131-3-2011
Fibre optic interconnecting devices and passive components - Performance standard - Part 131-3: Single-mode mechanical fibre splice for category U - Uncontrolled environment (IEC 61753-131-3:2010); German version EN 61753-131-3:2011