Alarm systems - Alarm transmission systems and equipment - Part 2-1: General requirements for alarm transmission equipment; German version EN 50136-2-1:1998 + Corrigendum 1998 + A1:2001
报警系统.报警传输系统和设备.第2-1部分:报警传输设备的一般要求;德文版EN 50136-2-1:1998+勘误表1998+A1:2001