4-15
ASUS AP1720-E2 barebone server
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System Power LED (3-pin PLED)
This lead connects to the system power LED. The LED lights up when you
turn on the system power, and blinks when the system is in sleep mode.
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Message LED (2-pin MLED)
This lead connects to the message LED cable on the front panel and
indicates the booting status. The LED blinks when the system is in the
boot process until the operating system is loaded.
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System warning speaker (4-pin SPEAKER)
This lead connects to the case-mounted speaker and allows you to
hear system beeps and warnings.
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Hard disk activity (2-pin HD_LED)
This lead connects the HDD LED cable. The read or write activities of
the device connected to the any of IDE connectors cause the IDE LED
to light up.
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Power switch / Soft-off switch (2-pin PWR_SW)
This lead connects a switch that controls the system power. Pressing
the power switch turns the system between ON and SLEEP, or ON and
SOFT OFF, depending on the BIOS or OS settings. Pressing the power
switch while in the ON mode for more than 4 seconds turns the system
OFF.
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Reset switch (2-pin RESET)
This lead connects to the chassis-mounted reset switch for rebooting
the system without turning off the system power.
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System Management Interrupt (2-pin SMI)
This lead connects to the chassis-mounted suspend switch. This
feature allows you to manually put the system into suspend mode, or
“green” mode, where system activity is instantly decreased to save
power and to expand the life of certain system components.