On the Desktop Board D865PERL, only the following connectors have overcurrent protection:

	Back panel USB, IEEE 1394a-2000, and PS/2
	Front panel USB and IEEE 1394a-2000

The other internal connectors of the Desktop Board D865PERL 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.

This section describes the connectors and are divided into these groups:

	Back Panel I/O Connectors
	Internal I/O Connectors
	External I/O 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.

The internal I/O connectors are divided into the following functional groups:

	Audio
	Power and Hardware Control
	Add-in Boards and Peripheral Interfaces

The figure below shows the location of the audio 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.

The figure below shows the location of the add-in board connector and peripheral connectors for the Desktop Board D865PERC. Note the following considerations for the PCI bus connectors:

	All of the PCI bus connectors are bus master capable.
	SMBus signals are routed to PCI bus connector 2. This enables PCI bus add-in boards with SMBus support to access sensor data on the Desktop Board. 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

The figure below shows the location of the external I/O connectors.

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.

The figure below is a connection diagram for the front panel USB connector.

	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.

The figure below is a connection diagram for the front panel IEEE 1394a-2000 connectors.

INTEGRATOR'S NOTES

	The +12 V DC power on the IEEE 1394a-2000 connectors is fused.
	Each IEEE 1394a-2000 connector provides one IEEE 1394a-2000 port.