FOTP236 - IEC 61280-2-9 - FIBRE OPTIC COMMUNICATION SUBSYSTEM TESTPROCEDURES - PART 2-9: DIGITAL SYSTEMS - OPTICAL SIGNAL-TO-NOISE RATIO MEASUREMENT FOR DENSE WAVELENGTH-DIVISION MULTIPLEXED SYSTEMS
FOTP236-IEC 61280-2-9-光纤通信子系统测试程序-第2-9部分:数字系统-密集波分复用系统的光信噪比测量