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26 Intel Server Board S875WP1-E Product Guide
Wake-up Devices and Events
CAUTION
For LAN wake capabilities, the 5 V standby line for the power supply must
be capable of providing adequate +5 V standby current. Failure to provide
adequate standby current when implementing LAN wake capabilities can
damage the power supply.
Table 9 provides an overview of the devices or events that can wake the computer from specific
states.
Table 9. Wake-up Devices and Events
These devices/events can wake up the computer… …from this state
Power button S1, S3, S4
(Note 1)
, S5
RTC alarm S1, S3, S4
(Note 1)
, S5
LAN S1, S3, S4
(Note 1)
, S5
PCI via PME# signal S1, S3, S4
(Note 1)
, S5
Resume on Ring (back panel Serial Port A) S1, S3
USB S1, S3
PS/2 S1, S3
Notes:
1. For LAN and PME#, S5 is disabled by default in the BIOS Setup program. Setting this option to Power On will
enable a wake-up event from LAN in the S5 state.
✏
NOTE
The use of these wake-up events from an ACPI state requires an operating
system that provides full ACPI support. In addition, software, drivers, and
peripherals must fully support ACPI wake events.
LAN Wake
LAN wake capabilities enable remote wake-up of the computer through a network. The LAN
subsystem PCI bus network adapter monitors network traffic at the Media Independent Interface.
Upon detecting a Magic Packet
*
frame, the LAN subsystem asserts a wake-up signal that wakes up
the computer from ACPI S1, S3, S4, and S5 state.
Depending on the LAN implementation, the S875WP1-E server board supports LAN wake
capabilities with ACPI in the following ways:
• The PCI bus PME# signal for PCI 2.2 compliant LAN designs
• The onboard LAN subsystem
PCI via PME# Wake-up Support
When the PME# signal on the PCI bus is asserted, the computer wakes from an ACPI S1, S3, S4, or
S5 state (with Wake on PME enabled in BIOS).