Home / Standards / GB/T 20999-2007 GB/T 20999-2007 Abolished Data communication protocol between traffic signal controller and control center 交通信号控制机与上位机间的数据通信协议 Standard Type GBT ICS 35.100.01 CCS L79 Status 废止 Issue Date 2007-07-17 Implementation 2008-01-01 Responsible Dept 国家标准委 Drafting Unit N/A