Fibre optic interconnecting devices and passive components performance standard - Part 021-6: Grade B/2 single-mode fibre optic connectors for category O - Uncontrolled environment (IEC 61753-021-6:2007); German version EN 61753-021-6:2008
纤维光学互连器件和无源元件性能标准.第021-6部分:O类B/2级单模纤维光学连接器.非受控环境(IEC 61753-021-6-2007);德文版EN 61753-021-6:2008