Home / Standards / GB/T 13859-1992 GB/T 13859-1992 Abolished Performance andtest methods of 30-channel pulse code modulation drop/insert equipment at 2048kbit/s 2048kbit/s 30路脉码调制分插设备技术要求与测试方法 Standard Type GBT ICS 33.060.30 CCS M32 Status 废止 Issue Date 1992-10-06 Implementation 1993-05-01 Responsible Dept 工业和信息化部（通信） Drafting Unit N/A