Alarm systems - Alarm transmission systems and equipment - Part 1-4: Requirements for systems with voice communicators using the public switched telephone network; German version EN 50136-1-4:1998
报警系统.报警传输系统和设备.第1-4部分:使用公共交换电话网的语音通信系统的要求;德文版EN 50136-1-4:1998