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CAUTION
On the Intel® Desktop Board D875PBZ, only the following connectors have overcurrent protection:
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Back panel USB and PS/2
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Front panel USB
The other internal connectors of the Intel® Desktop Board D875PBZ are not overcurrent protected and should connect only to devices inside the computer's chassis, such as fans and internal peripherals. Do not use these connectors to power devices external to the computer's chassis. A fault in the load presented by the external devices could cause damage to the computer, the interconnecting cable, and the external devices themselves.
Back Panel Connectors
The figure below shows the location of the back panel connectors. The back panel connectors are color-coded in compliance with PC 99 recommendations. The figure legend below lists the colors used.
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Item
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Description
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Color
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| A |
PS/2 mouse port |
Green |
| B |
PS/2 keyboard port |
Purple |
| C |
USB ports (four) |
Black |
| D |
Serial port A |
Teal |
| E |
Parallel port |
Burgundy |
| F |
LAN |
Black |
| G |
USB ports (two) |
Black |
| H |
Audio line in (optional) |
Light blue |
| I |
Mic in (optional) |
Pink |
| J |
Audio line out (optional) |
Lime green |
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Internal I/O Connectors
The internal I/O connectors are divided into the following functional groups:
- Audio
- Power and hardware control
- Add-in boards and peripheral interfaces
Audio Connectors
The figure below shows the location of the audio connectors.
| Item | Description | | A | ATAPI-style auxiliary line input | | B | Front panel audio | | C | ATAPI CD-ROM |
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Power and Hardware Control Connectors CAUTION
The processor fan must be connected to the processor fan connector, not to a chassis fan connector. Connecting the processor fan to a chassis fan connector may result in onboard component damage that will halt fan operation. The figure below shows the location of the power and hardware control connectors. 
| Item | Description | | A | Rear chassis fan | | B | +12 V power connector (ATX12V) | | C | Voltage regulator fan | | D | Processor fan | | E | Main power | | F | Front chassis fan | | G | Chassis intrusion |
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Note: Do not use a standard ATX power supply. The Intel® Desktop Board D875PBZ will not boot with a standard ATX power supply. Use only ATX12V-compliant power supplies with the Intel® Desktop Board D875PBZ. ATX12V power supplies have an additional power lead that provides required supplemental power for the Intel® Pentium® 4 processor. The Intel® Desktop Board D875PBZ will not boot if the ATX12V power supply is not connected to both the 4-pin and 20-pin power connectors. Add-in Board and Peripheral Interface Connectors The figure below shows the location of the add-in board and peripheral connectors for the Intel® Desktop Board D875PBZ. Note the following considerations for the PCI bus connectors: - All of the PCI bus connectors are bus master capable.
- The SMBus is routed to PCI bus connector 2. This enables PCI bus add-in boards with SMBus support to access sensor data on the Desktop Board D875PBZ. The specific SMBus signals are as follows:
- The SMBus clock line is connected to pin A40
- The SMBus data line is connected to pin A41
| Item | Description | | A | PCI bus connector 5 | | B | PCI bus connector 4 | | C | PCI bus connector 3 | | D | PCI bus connector 2 | | E | PCI bus connector 1 | | F | AGP | | G | Diskette drive | | H | Primary Parallel ATA IDE (black) | | I | Secondary Parallel ATA IDE (white) | | J | SCSI hard drive activity LED connector | | K | Serial ATA/Serial ATA RAID connector 1 | | L | Serial ATA/Serial ATA RAID connector 0 |
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External I/O Connectors The figure below shows the location of the external I/O connectors. 
| Item | Description | | A | Front panel | | B | Auxilary front panel power/sleep/message-waiting LED | | C | Front panel USB (black) |
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Front Panel Connector This section describes the functions of the front panel connector. The table below lists the signal names of the front panel connector. The figure below is a connection diagram for the front panel connector. Hard Drive Activity LED | Pin | Signal | In/Out | Description | | 1 | HD_PWR | Out | Hard disk LED pull-up (750 ohm) to +5 V | | 3 | HAD# | Out | Hard disk active LED |
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Power LED | Pin | Signal | In/Out | Description | | 2 | HDR_BLNK_GRN | Out | Front panel green LED | | 4 | HDR_BLNK_YEL | Out | Front panel yellow LED |
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Reset Switch | Pin | Signal | In/Out | Description | | 5 | Ground | | Ground | | 7 | FP_RESET# | In | Reset switch |
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On/Off Switch | Pin | Signal | In/Out | Description | | 6 | FPBUT_IN | In | Power switch | | 8 | Ground | | Ground |
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Power | Pin | Signal | In/Out | Description | | 9 | +5 V | | Power |
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Not Connected | Pin | Signal | In/Out | Description | | 10 | N/C | | Not connected |
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Front Panel USB Connector
The figure below is a connection diagram for the front panel USB connector. Integrator's notes - The +5 V DC power on the USB connector is fused.
- Pins 1, 3, 5, and 7 comprise one USB port.
- Pins 2, 4, 6, and 8 comprise one USB port.
- Use only a front panel USB connector that conforms to the USB 2.0 specification for high-speed USB devices.
This applies to:
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