KS C IEC 61300-3-20:2014 Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-20: Examinations and measurements — Directivity of fibre optic branching devices
2020KS C IEC 61300-3-20:2020 Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-20: Examinations and measurements — Directivity of fibre optic branching devices
2014KS C IEC 61300-3-20:2014 Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-20: Examinations and measurements — Directivity of fibre optic branching devices
2004KS C IEC 61300-3-20:2004 Fibre optic interconnecting devices and passive components-Basic test and measurement procedures-Part 3-20:Examinations and measurements-Directivity of fibre optic branching devices