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Intel Desktop Board D850GB/D850GBAL Product Guide
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5. Add all additional wake-enabled devices’ and nonwake-enabled devices’ standby current
requirements as applicable.
6. Add all the required current totals from steps 1 through 5 to determine the total estimated
standby current power supply requirement.
Table 3. Standby Current Requirements
Instantly Available Current
Support Description
Standby Current
Requirements (mA)
Estimate for integrated board
components
Total for the D850GB board 770
PS/2 ports
*
345
PCI 2.2 slots (wake-enabled) 375
PCI 2.2 slots (nonwake-enabled) 100
WOL header 525
CNR* (wake enabled) 875
CNR* (non-wake enabled) 40
Estimate for add-on components
(Add to integrated board
components shown above)
USB ports
*
700
* Dependent upon system configuration
✏
NOTE
PCI requirements are calculated by totaling the following:
• One wake-enabled device @ 375 mA
• Five non wake-enabled devices @ 20 mA each
PS/2 Ports requirements per the IBM PS/2 Port Specification (Sept 1991):
• Keyboard @ 275 mA
• Mouse @ 70 mA
USB requirements are calculated by totaling the following:
• One wake-enabled device @ 500 mA
• USB hub @ 100 mA
• Three USB non-wake-enabled devices @ 2.5 mA each
The USB ports are limited to a combined total of 700 mA.
Resume on Ring
The operation of Resume on Ring can be summarized as follows:
• Resumes operation from either the APM sleep mode or the ACPI S1 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