Chapter 1: Introduction Pressing the power button again will cause the whole system to wake-up. During the SoftOff state, the ATX power supply provides power to keep the required circuitry in the system alive. In case the system malfunctions and you want to turn off the power, just press and hold the power button for 4 seconds. The power will turn off and no power will be provided to the motherboard. Wake-up events can be triggered by a device such as the external modem ringing Wake Ring-On (WOR) when the system is in the SoftOff state. Note that external modem ring-on can only be used with an ATX 2.01 (or above) compliant power supply.
Wake-On-LAN (WOL) Wake-On-LAN is defi ned as the ability of a management application to remotely power up a computer that is powered off. Remote PC setup, up-dates and asset tracking can occur after hours and on weekends so that daily LAN traffi c is kept to a minimum and users are not interrupted. The motherboard has a 3-pin header (WOL) to connect to the 3-pin header on a Network Interface Card (NIC) that has WOL capability. In addition, an onboard LAN controller can also support WOL without any connection to the WOL header. The 3-pin WOL header is to be used with a LAN add-on card only. *Note : Wake-On-LAN requires an ATX 2.01 (or above) compliant power supply.
1-5 ACPI Features ACPI stands for Advanced Confi guration and Power Interface. The ACPI specifi - cation defi nes a fl exible and abstract hardware interface that provides a standard way to integrate power management features throughout a PC system, including its hardware, operating system and application software. This enables the system to automatically turn on and off peripherals such as CD-ROMs, network cards, hard disk drives and printers. This also includes consumer devices connected to the PC such as VCRs, TVs, telephones and stereos.
In addition to enabling operating system-directed power management, ACPI provides a generic system event mechanism for Plug and Play and an operating and Play BIOS data structures while providing a processor architecture-indepen- system-independent interface for confi guration control. ACPI leverages the Plug dent implementation that is compatible with both Windows and Linux Operating Systems. 1-6 Power Supply As with all computer products, a stable power source is necessary for proper and reliable operation. It is even more important for processors that have high CPU clock rates of 1 GHz and faster. 1-11