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28 Intel Server Board S845WD1-E Product Guide
Resume on Ring
The operation of Resume on Ring can be summarized as follows:
• Resumes operation from the ACPI S1.
• Requires only one call to access the server.
• Detects incoming call similarly for external and internal modems; does not use the Wake on
Ring connector.
• Requires modem interrupt be unmasked for correct operation.
ACPI
ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer. The use of ACPI with the S845WD1-E server board requires an operating
system that provides full ACPI support.
ACPI features include:
• Plug and Play (including bus and device enumeration)
• Power management control of individual devices, add-in boards (some add-in boards may
require an ACPI-aware driver), video displays, and hard disk drives
• Methods for achieving less than 15-watt system operation in the power-on/standby
sleeping state
• A Soft-off feature that enables the operating system to power-off the computer
• Support for multiple wake-up events (see Table 7. Wake-up Devices and Events, page30)
• Support for a front panel power and sleep mode switch