DIN EN 61280-2-9:2009 光学纤维通讯子系统测试程序.第2-9部分:数字系统.密集波分复用系统光学纤维信噪比率的测量
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