Universal Serial Bus Interface; Usb Connector - HP Compaq dc7900 USDT Technical Reference Manual

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, 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
ICH10
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

5.7.1 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
ICH10 USB Port Mapping
Signals
Data 0P, 0N
Data 1P, 1N
Data 2P, 2N
Data 3P, 3N
Data 4P, 4N
Data 5P, 5N
Data 6P, 6N
Data 7P, 7N
Data 8P, 8N
Data 9P, 9N
Data 10P, 10N
Data 1 1P, 1 1N
Table 5-7.
USB Connector Location (all form factors
System board header P151
not connected
System board header P150
System board header P150
Front panel USB
Front panel USB
Rear panel USB
Rear panel USB
Rear panel USB
Rear panel USB
Rear panel USB
Rear panel USB
1 2 3 4
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Input/Output Interfaces
5-11