Usb Connector; Universal Serial Bus Interface (5.8) - HP Compaq dc7800 Series Technical Reference Manual

5.8 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, the SFF and CMT form factors
support a media reader accessory that uses two USB ports through a system board connection.
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 5-7 shows the mapping of the USB ports.
USB
ICH9
Controller
USB 1.1 #1,
USB 2.0 #1
USB 1.1 #2
USB 2.0 #1
USB 1.1 #3
USB 2.0 #1
USB 1.1 #4
USB 2.0 #2
USB 1.1 #5
USB 2.0 #2
USB 1.1 #6
USB 2.0 #2

5.8.1 USB Connector

These systems provide type-A USB ports as shown in Figure 5-7.
Figure 5-8. Universal Serial Bus Connector (as viewed from rear of chassis)
Technical Reference Guide
ICH9 USB Port Mapping
Signals USDT, SFF Form Factors
Data 0P, 0N System board header P150
Data 1P, 1N System board header P150
Data 2P, 2N
Data 3P, 3N
Data 4P, 4N
Data 5P, 5N
Data 6P, 6N Rear panel quad USB stack
Data 7P, 7N Rear panel quad USB stack
Data 8P, 8N Rear panel quad USB stack
Data 9P, 9N Rear panel quad USB stack
Data 10P, 10N Rear panel dual USB stack w/RJ-45
Data 1 1P, 1 1N Rear panel dual USB stack w/RJ-45
Table 5-7.
USB Connector Location
Front panel USB
Front panel USB
Not used
Not used
1 2 3 4
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Input/Output Interfaces
CMT Form Factor
Rear panel dual USB stack w/RJ-45
Rear panel dual USB stack w/RJ-45
Rear panel quad USB stack
Rear panel quad USB stack
Rear panel quad USB stack
Rear panel quad USB stack
system board header P150
system board header P150
Front panel USB
Front panel USB
Not used
Not used
5-11