Intel D925XHY English Product Guide - Page 20

Resume on Ring

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Intel Desktop Board D925XHY Product Guide CAUTION Power supplies used with this desktop board must be able to provide enough standby current to support the standard Instantly Available (ACPI S3 sleep state) configuration. If the standby current necessary to support multiple wake events from the PCI and/or USB buses exceeds power supply capacity, the desktop board may lose register settings stored in memory. Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep state. While in the S3 sleep state, the computer will appear to be off. When signaled by a wake-up device or event, the system quickly returns to its last known awake state. The desktop board's standby power indicator, shown in Figure 2, is lit when there is standby power to the system. This includes the memory modules and PCI bus connectors, even when the computer appears to be off. If the system has a dual-colored power LED on the front panel, the sleep state is indicated by the LED turning amber. OM19121 Figure 2. Location of Standby Power Indicator Related Links For more information on standby current requirements for the desktop board, go to the link below, select the desktop board name, and then select Technical Documentation: http://developer.intel.com/design/motherbd/ Resume on Ring The operation of Resume on Ring can be summarized as follows: • Resumes operation from either ACPI S1 or ACPI S3 state • Requires only one call to access the computer • Detects incoming call similarly for external and internal modems • Requires modem interrupt be unmasked for correct operation 20

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Intel Desktop Board D925XHY Product Guide
20
CAUTION
Power supplies used with this desktop board must be able to provide enough standby current to
support the standard Instantly Available (ACPI S3 sleep state) configuration.
If the standby
current necessary to support multiple wake events from the PCI and/or USB buses exceeds power
supply capacity, the desktop board may lose register settings stored in memory.
Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep
state.
While in the S3 sleep state, the computer will appear to be off.
When signaled by a wake-up
device or event, the system quickly returns to its last known awake state.
The desktop board’s standby power indicator, shown in Figure 2, is lit when there is standby power
to the system.
This includes the memory modules and PCI bus connectors, even when the
computer appears to be off.
If the system has a dual-colored power LED on the front panel, the sleep state is indicated by the
LED turning amber.
OM19121
Figure 2.
Location of Standby Power Indicator
Related Links
For more information on standby current requirements for the desktop board, go to the link below,
select the desktop board name, and then select Technical Documentation:
Resume on Ring
The operation of Resume on Ring can be summarized as follows:
•
Resumes operation from either ACPI S1 or ACPI S3 state
•
Requires only one call to access the computer
•
Detects incoming call similarly for external and internal modems
•
Requires modem interrupt be unmasked for correct operation