Home / Standards / GB/T 12640-1990 GB/T 12640-1990 Active Methods of measurement for the digital microwave radio relay communication equipments 数字微波接力通信设备测量方法 Standard Type GBT ICS 33.040.40 CCS M34 Status 现行 Issue Date 1990-12-28 Implementation 1991-10-01 Responsible Dept 工业和信息化部（电子） Drafting Unit N/A