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1. USB1, USB2: External 4 Port USB Connectors From the Mainboard
2. FAN1, FAN2, FAN3, FAN4: Fan Connector
3. ATXCTL1: Backplane to Mainboard ATX Power Control Connector
4. PWRBTN: External Power On Button
5. RESET: External Reset Button Connector
SPE-4S-R10
4-Slot PICMG 1.3 PCIe Backplane
User Manual Ver. 1.02
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6. PWRGD: External Power Good Connector
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7. SM-BUS: External System Management BUS Connector
8. CN2: PCIE X8 SDVO Control Signal Pin
9. ATX PWR1: The ATX Power Connector indicators for controlling
your CPU board.