Home / Standards / GB/T 18478-2001 GB/T 18478-2001 Active Fiber optic circulators 纤维光学环行器 Standard Type GBT ICS 33.180.01 CCS M33 Status 现行 Issue Date 2001-09-28 Implementation 2002-05-01 Responsible Dept 工业和信息化部(通信) Drafting Unit N/A