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1.13.2.4 Instantly Available Technology
CAUTION
For Instantly Available technology, 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
using this feature can damage the power supply. Refer to Section 2.11.3 on page 54 for additional
information.
Instantly Available 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 (the power supply is off, the
fans are off, and the power LED is amber). When signaled by a wake up device or event, the
system quickly returns to its last known wake state. Table 9 on page 29 lists the devices and
events that can wake the computer from the S3 state.
The board supports the PCI Bus Power Management Interface Specification. For information on
the versions of these specifications, see Section 1.3. Add-in boards that also support these
specifications can participate in power management and can be used to wake the computer.
1.13.2.5 Wake on Ring
✏
NOTE
Wake on Ring requires the use of a modem (external USB or internal PCI) that supports the Wake
on Ring feature.
The operation of Wake on Ring can be summarized as follows:
• Wakes up the computer from the ACPI S5 state
• Requires two calls to access the computer:
First call restores the computer
Second call enables access (when the appropriate software is loaded)
• Detects incoming calls differently for external as opposed to internal modems:
For external USB modems, the USB bus is monitored for the RING_DETECT signal
For internal PCI modems, incoming calls are detected through the PCI bus PME# signal
1.13.2.6 Resume on Ring
The operation of Resume on Ring can be summarized as follows:
• Resumes operation from the ACPI S1 state
• Requires only one call to access the computer
• Detects incoming call similarly for external and internal modems