Intel D850EMD2 Product Guide - Page 17

RJ-45 LAN Connector LEDs, Speaker, Battery, Power Management Features

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Desktop Board Features RJ-45 LAN Connector LEDs Two LEDs are built into the RJ-45 LAN connector. Table 3 describes the LED states when the board is powered up and the LAN subsystem is operating. Table 3. RJ-45 LAN Connector LEDs LED Color Green Yellow LED State Off On Off On (steady state) On (brighter and pulsing) Indicates 10 Mbit/sec data rate is selected. 100 Mbit/sec data rate is selected. LAN link is not established. LAN link is established. The computer is communicating with another computer on the LAN. Speaker A 47 Ω inductive speaker is mounted on the desktop board. The speaker provides audible error code (beep code) information during the Power-On Self-Test (POST). Battery A battery on the desktop board keeps the values in CMOS RAM and the clock current when the computer is turned off. See Chapter 2 on page 21 for instructions on how to replace the battery. Power Management Features Power management is implemented at several levels, including: • Software support:  Advanced Configuration and Power Interface (ACPI)  Advanced Power Management (APM) • Hardware support:  Instantly Available technology  Resume on Ring  Wake from USB  Wake from PS/2 keyboard  PCI card wakeup support If the desktop board is used with an ACPI-aware operating system, the BIOS can provide ACPI support. Otherwise, it defaults to APM support. 17

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Desktop Board Features
17
RJ-45 LAN Connector LEDs
Two LEDs are built into the RJ-45 LAN connector. Table 3 describes the LED states when the
board is powered up and the LAN subsystem is operating.
Table 3.
RJ-45 LAN Connector LEDs
LED Color
LED State
Indicates
Off
10 Mbit/sec data rate is selected.
Green
On
100 Mbit/sec data rate is selected.
Off
LAN link is not established.
On (steady state)
LAN link is established.
Yellow
On (brighter and pulsing)
The computer is communicating with another computer on
the LAN.
Speaker
A 47
Ω
inductive speaker is mounted on the desktop board.
The speaker provides audible error
code (beep code) information during the Power-On Self-Test (POST).
Battery
A battery on the desktop board keeps the values in CMOS RAM and the clock current when the
computer is turned off.
See Chapter 2 on page 21 for instructions on how to replace the battery.
Power Management Features
Power management is implemented at several levels, including:
•
Software support:
Advanced Configuration and Power Interface (ACPI)
Advanced Power Management (APM)
•
Hardware support:
Instantly Available technology
Resume on Ring
Wake from USB
Wake from PS/2 keyboard
PCI card wakeup support
If the desktop board is used with an ACPI-aware operating system, the BIOS can provide ACPI
support.
Otherwise, it defaults to APM support.