Intel Desktop Board D975XBX Technical Product Specification
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2.7.2.4.1 Hard Drive Activity LED Connector [Orange]
Pins 1 and 3 [Orange] can be connected to an LED to provide a visual indicator that data is being
read from or written to a hard drive. Proper LED function requires one of the following:
• A Serial ATA hard drive connected to an onboard Serial ATA connector
• An IDE hard drive connected to an onboard IDE connector
2.7.2.4.2 Reset Switch Connector [Blue]
Pins 5 and 7 [Blue] can be connected to a momentary single pole, single throw (SPST) type switch
that is normally open. When the switch is closed, the board resets and runs the POST.
2.7.2.4.3 Power/Sleep LED Connector [Green]
Pins 2 and 4 [Green] can be connected to a one- or two-color LED. Table 31 shows the possible
states for a one-color LED. Table 32 shows the possible states for a two-color LED.
Table 31. States for a One-Color Power LED
LED State Description
Off Power off/sleeping
Steady Green Running
Table 32. States for a Two-Color Power LED
LED State Description
Off Power off
Steady Green Running
Steady Yellow Sleeping
NOTE
The colors listed in Table 31 and Table 32 are suggested colors only. Actual LED colors are
product- or customer-specific.
2.7.2.4.4 Power Switch Connector [Red]
Pins 6 and 8 [Red] can be connected to a front panel momentary-contact power switch. The switch
must pull the SW_ON# pin to ground for at least 50 ms to signal the power supply to switch on or
off. (The time requirement is due to internal debounce circuitry on the board.) At least two
seconds must pass before the power supply will recognize another on/off signal.
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