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Server Board Features 27
Resume on Ring
Resume on Ring enables telephony devices to access the computer when it is in a power-managed
state. The operation of Resume on Ring wakes the system from the S1 or S3 sleep states when a
signal is sent to the serial port at the rear or the chassis or to an internally installed modem. Resume
on ring can be summarized as follows:
• Resumes operation from ACPI S1 or S3 states
• 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
Wake from USB
USB bus activity wakes the computer from an ACPI S1 or S3 state.
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NOTE
Wake from USB requires the use of a USB peripheral that supports Wake
from USB.
Wake from PS/2 Devices
PS/2 device activity, such as moving a PS/2 mouse or pressing a key on a PS/2 keyboard, wakes the
computer from an ACPI S1 or S3 state.
Hardware Support
The S875WP1-E server board provides several power management hardware features, including:
• Power connector
• Fan connectors
• Instantly Available PC technology
Instantly Available PC technology and LAN Wake require power from the +5 V standby line. The
sections discussing these features describe the incremental standby power requirements.
CAUTION
Ensure that the power supply provides adequate +5 V standby current if
Instantly Available PC technology features is used. Failure to do so can
damage the power supply. The total amount of standby current required
depends on the wake devices supported and manufacturing options.