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Confidential
Basic Operation
Wake Up Signal
Power Switch
Signal
If the Chipset (82801BA) receives a Wake Up Signal from LAN or the Soft Power Switch is
pressed, it outputs a power-on signal to the power supply (if the poweris off) or an LMI signal (if
the machine is in the suspend state) to resume.
Because the wake-up signal is received by the chipset, backup is always active as long as AC
power is supplied.
Software Settings
BIOS Settings
The following settings must be made in BIOS setup to enable Wake On LAN.
Wake-Up by PCI in Power Management Setup
Disable:
Enable:
When this is set to Enable, a wake-up by Wake On LAN is possible. This is specifies whether or
not the chipset, shown in the figure above, recognizes the Wake On LAN signal.
Precautions
1. When a system using Wake On LAN is shut down by the OS or shut off normally by the soft
power switch, the function is enabled. If the soft power switch is pressed and held down for
4 seconds, or if the OS does not finish normally, the function is disabled.
At power off, BIOS sets the chipset for this item to off, which means the function is always
disabled when power is turned back on. If the front switch is depressed for 4 seconds, the
machine powers off without going through BIOS, and the function will be disabled
regardless of the BIOS setting.
2. If the OI-R03 battery unit is not installed, Wake On LAN is not enabled immediately after
AC power is turned on, even though the BIOS has been set. On the other hand, if the OI-R03
battery unit is installed, immediately after AC power is turned on, chipset settings are
initialized and, therefore, do not reflect BIOS settings. As a result, Wake On LAN always
must be set to on by hardware, regardless of the BIOS setting, between AC power on and the
first Wake On LAN.
A-2 Wake On LAN
Chipset
(82801BA)
Signal Paths in Wake On LAN
Wake On LAN disabled
Wake On LAN enabled
Power On
Power
Signal
Supply
Unit
SMI
Rev. C
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