Home / Standards / GB 3379-1982 GB 3379-1982 Abolished Interoffice direct signalling system for telephone automatic switching network 电话自动交换网局间直流信号方式 Standard Type GB ICS 33.040.30 CCS M12 Status 废止 Issue Date 1982-12-29 Implementation 1983-10-01 Responsible Dept 工业和信息化部（通信） Drafting Unit N/A