ETSI ETS 300 603 PRA1-1994 欧洲数字蜂窝通信系统(第2阶段).公共陆地移动网(PLMN)和支持信息包交换数字传输的信息包交换公用数据网/综合业务数字网(PSPDN/ISDN)之间的互通
AMD 1 European Digital Cellular Telecommunications System (Phase 2); Interworking between Network (PLMN) and a Packet Switched Public Data Network/Integrated Services Digital Network (PSPDN/ ISDN) for the Support of Packet Switched Data Transmission Servi