LST EN 60793-2-50-2009 Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2008)
LST EN 60793-2-50-2004LST EN 60793-2-50-2004/AC-2005
LST EN 60793-2-50-2009 history
2009LST EN 60793-2-50-2009 Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2008)