Technical Reference Guide www.hp.com 5-11
Input/Output Interfaces
5.7 Universal 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
1.1 controllers 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.
5.7.1 USB Connector
These systems provide type-A USB ports as shown in Figure 5-7.
Figure 5-7 Universal Serial Bus Connector (as viewed from rear of chassis)
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
Table 5-7.
USB Connector Pinout
Pin Signal Description Pin Signal Description
1 Vcc +5 VDC 3 USB+ Data (plus)
2USB- Data (minus) 4GNDGround
1 2
3 4
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