NF Z84-392-12-16*NF EN 300392-12-16:2004 无线电设备和系统(RES)地面中继无线电(TETRA)声音加数据(V+D)第12部分:补充业务阶段3.第16分部分:抢先优先权呼叫(PPC)
Radio equipment and systems (RES) - Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12 : supplementary services stage 3 - Sub-part 16 : pre-emptive Priority Call (PPC) (V1.2.1)