Product Description

1.13.2.4Instantly 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.

1.13.2.5Wake 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

1.13.2.6Resume 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

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