![]() S4 - Suspend to disk (hibernate mode).The CPU clock stops, but RAM powers on and refreshes. S1 - System is in low-power mode (sleep mode).Each state represents a different level of power, from fully powered up to completely powered down, with partial levels of power in each intermediate state. Newer computers feature Advanced Configuration and Power Interface (ACPI), which extends the APM concept to allow the OS to selectively control power by individual components.ĪCPI supports many power states. This early implementation didn't require an OS that was aware of remote wake-up.ĪPM provided BIOS-based power control. The ability to power on the computer allowed network administrators to complete off-hours maintenance at remote locations without sending a technician. ![]() The power control circuitry, in response, activates power resulting in the computer starting the OS. ![]() The system could start from a powered off state by sending a Magic Packet*. By toggling a signal connected to the computer power control circuitry, the adapter responds to a Magic Packet that has its own MAC address. The feature has evolved from a simple remote power-on to a complex system able to interact with many devices and operating system (OS) power states.Įarly implementations required the system to have a standby power supply. The ability to remotely wake computers is an important development in computer management.
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