Home / Standards / GB/T 15409-2008 GB/T 15409-2008 Active Frame structure for synchronous digital hierarchy signal 同步数字体系信号的帧结构 Standard Type GBT ICS 33.040.20 CCS M33 Status 现行 Issue Date 2008-10-29 Implementation 2009-05-01 Responsible Dept 工业和信息化部(通信) Drafting Unit N/A