UNE-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 (Endorsed by AENOR in July of 2009.)
2009UNE-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 (Endorsed by AENOR in July of 2009.)