Home / Standards / GB/T 15972.49-2021 GB/T 15972.49-2021 Active Specifications for optical fibre test methods—Part 49: Measurement methods and test procedures for transmission characteristics—Differential mode delay 光纤试验方法规范 第49部分：传输特性的测量方法和试验程序 微分模时延 Standard Type GBT ICS 33.180.10 CCS M33 Status 现行 Issue Date 2021-10-11 Implementation 2022-05-01 Responsible Dept 工业和信息化部（通信） Drafting Unit N/A