BS EN 50551-2-2013 用于索线的单工和双芯电缆.用于U类插接线/索线3.0 mm单工坚固的单模光缆的空白详细规范和最低要求
Simplex and duplex cables to be used for cords. Detailed specification and minimum requirements for a 3,0 mm simplex ruggedised single mode fibre cable to be used for patchcords/cords category U