Where does a security system central processing unit normally receive its electrical power?

A security system's central processing unit (CPU) typically receives its electrical power from a dedicated power supply unit that converts standard AC voltage from a wall outlet to the appropriate DC voltage required by the system. In some cases, it may also draw power from a backup battery to ensure continuous operation during outages. Additionally, some systems can receive power through Power over Ethernet (PoE) if they are connected to compatible devices, allowing for a single cable to provide both data and power.