BS EN 61753-121-3:2010
光纖互連裝置和無源組件.性能標準.U類用帶有單模光纖和圓形套圈連接器的單工和雙工電線.不受控環境
Fibre optic interconnecting devices and passive components. Performance standard. Part 121-3: Simplex and duplex cords with single-mode fibre and cylindrical ferrule connectors for category U. Uncontrolled environment