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24 Intel Server Board S875WP1-E Product Guide
Table 7 describes the LED states when the board is powered up and the 82547EI 10/100/1000
Gigabit Ethernet LAN subsystem is operating.
Table 7. 10/100/1000 Gigabit Ethernet LAN Connector LEDs
LED Color LED State Indicates
Off LAN link is not established.
On (steady state) LAN link is established.
Green (left
LED)
On (brighter and
pulsing)
The computer is communicating with another computer on the LAN.
Off 10 Mbit/sec data rate is selected.
Green 100 Mbit/sec data rate is selected.
Bi-color LED
(right LED)
Yellow 1000 Mbit/sec data rate is selected.
Power Management
Power management is implemented at several levels, including:
• Software support through Advanced Configuration and Power Interface (ACPI)
• Hardware support:
— Suspend to RAM (Instantly Available PC technology)
— Power connectors
— Fan connectors
— Resume on Ring
— Wake from USB
— Wake from PS/2 keyboard/mouse
— PME# wakeup support
Software Support through ACPI
The Advance Configuration and Power Interface (ACPI)–aware operating system can place the
system into a state where the hard drives spin down, the system fans stop, and all processing is
halted. In this state, the power supply is still on and the processors still dissipate some power, so
the power supply fan and processor fans are still running.
Under ACPI, the operating system directs all system and device power state transitions. The
operating system puts devices in and out of low-power states based on user preferences and
knowledge of how devices are being used by applications. Devices that are not being used can be
turned off. The operating system uses information from applications and user settings to put the
system as a whole into a low-power state.