The DC power supply system consists of rectifiers, batteries, DC converters, and DC distribution panels. When the mains power is interrupted, the battery alone supplies power to the communication equipment. Due to the fact that the battery is usually in a fully charged state, in the event of a short-term interruption of mains power, the battery ensures uninterrupted power supply. If the mains power outage period is too long, the rectifier should be powered by the oil engine generator set. The DC power supply system is a power supply system that provides DC (basic) power to the communication bureau (station). According to the General Technical Requirements for Communication Bureau (Station) Power System issued by the Ministry of Information Industry, − 48 V and − 24 V are DC basic power sources, with − 48 V being the preferred basic power source and − 24 V being the transitional power source (to be phased out). In practical applications, if a power supply of − 24 V or other DC voltage types is necessary, the basic power supply of − 48 V is generally converted into a power supply of − 24 V or other DC voltage types through a DC DC converter
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