Supermicro PDSBA, User Manual

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Chapter 1: Introduction
1-11
Slow Blinking LED for Suspend-State Indicator
When the CPU goes into a suspend state, the chassis power LED will start blinking
to indicate that the CPU is in suspend mode. When the user presses any key, the
CPU will wake-up and the LED will automatically stop blinking and remain on.
BIOS Support for USB Keyboard
If the USB keyboard is the only keyboard in the system, it will function like a normal
keyboard during system bootup.
Main Switch Override Mechanism
When an ATX power supply is used, the power button can function as a system
suspend button. When the user presses the power button, the system will enter a
SoftOff state. The monitor will be suspended, and the hard drive will spin down.
Pressing the power button again to wake-up the whole system. 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-On-Ring (WOR) Header
Wake-up events can be triggered by a device such as the external modem ringing
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.
1-5 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.
The PDSBA-Q+/PDSBA+/PDSBA/PDSBE accommodates 12V ATX
power supplies. It is strongly recommended that you use a high quality power sup-
ply that meets 12V ATX power supply Specifi cation 1.1 or above. It is also required
that the 12V 4-pin power connection (J41) be used for high-load confi gurations. In
areas where noisy power transmission is present, you may choose to install a line
fi lter to shield the computer from noise. It is recommended that you also install a
power surge protector to help avoid problems caused by power surges.