DIN EN 300132-2-2007 环境工程.向电信设备输入的电源接口.第2部分:直流(dc)操作
Environmental Engineering (EE) - Power supply interface at the input to telecommunications equipment - Part 2: Operated by direct current (dc) (Endorsement of the English version EN 300132-2 V2.2.1 (2007-05) as German standard)