DIN EN 61280-2-9:2003-07

Fibre optic communication subsystem test procedures - Part 2-9: Digital systems - Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems (IEC 61280-2-9:2009); German version EN 61280-2-9:2009.

Fibre optic communication subsystem test procedures - Part 2-9: Digital systems; Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems (IEC 61280-2-9:2002); German version EN 61280-2-9:2002.

Fibre optic communication subsystem basic test procedures - Part 2-9: Test procedures for digital systems; Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems (IEC 86C/342/CDV:2001); German version prEN 61280-2-9:2001