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电话光端机电源线和地线连接方法
电话光端机的电源线连接：设备标准机型电源配置为DC-48V或AC~220V，在设备接入电源之前，请先测量接入电源的电压值及电源功率是否在设备的要求范围之内：-48V电源： -48V±10%；AC220V电源：标准AC220V±20%，50Hz；在给设备引入电源之前请检查设备的电源开关是否置于OFF，…
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