HP Small Form Factor PC dc5850 5.7Universal Serial Bus Interface, 5.7.1 USB Connector

Input/Output Interfaces

5.7Universal Serial Bus Interface

The Universal Serial Bus (USB) interface provides asynchronous/isochronous data transfers with compatible peripherals such as keyboards, printers, or modems. This high-speed interface supports hot-plugging of compatible devices, making possible system configuration changes without powering down or even rebooting systems.

These systems provide eight externally-accessible USB ports, two front panel USB ports (which may be disabled) and six USB ports on the rear panel. In addition, twe USB ports are available through an internal header (The USB ports are dynamically configured to either a USB 1.1 controller or the USB 2.0 controller depending on the capability of the peripheral device. The

1.1controllers provide a maximum transfer rate of 12 Mb/s while the 2.0 controller provides a maximum transfer rate of 480 Mb/s. Table 5-6 shows the mapping of the USB ports.

	Table 5-6.
	USB Port Mapping
SB700 signals	USB Connector Location
Data 0P, 0N	Rear panel quad stack
Data 1P, 1N	Rear panel quad stack
Data 2P, 2N	Rear panel quad stack
Data 3P, 3N	Rear panel quad stack
Data 4P, 4N	Rear panel dual w/RJ-45
Data 5P, 5N	Rear panel dual w/RJ-45
Data 6P, 6N	System board header P150
Data 7P, 7N	System board header P150
Data 8P, 8N	Front panel thru P24
Data 9P, 9N	Front panel thru P24

5.7.1 USB Connector

These systems provide type-A USB ports as shown in Figure 5-7.

1 2 3 4

Figure 5-7 Universal Serial Bus Connector (as viewed from rear of chassis)

			Table 5-7.
		USB Connector Pinout
Pin	Signal	Description		Pin	Signal	Description
1	Vcc	+5 VDC		3	USB+	Data (plus)
2	USB-	Data (minus)		4	GND	Ground

Technical Reference Guide www.hp.com 5-11