HP Dc7800 Technical Reference Guide: HP Compaq dc7800 Series Business Desktop - Page 65
Universal Serial Bus Interface
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Input/Output Interfaces 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 Table 5-7. ICH9 USB Port Mapping ICH9 Controller Signals USB Connector Location USDT, SFF Form Factors CMT Form Factor USB 1.1 #1, USB 2.0 #1 Data 0P, 0N Data 1P, 1N System board header P150 System board header P150 Rear panel dual USB stack w/RJ-45 Rear panel dual USB stack w/RJ-45 USB 1.1 #2 USB 2.0 #1 Data 2P, 2N Data 3P, 3N Front panel USB Front panel USB Rear panel quad USB stack Rear panel quad USB stack USB 1.1 #3 USB 2.0 #1 Data 4P, 4N Data 5P, 5N Not used Not used Rear panel quad USB stack Rear panel quad USB stack USB 1.1 #4 USB 2.0 #2 Data 6P, 6N Data 7P, 7N Rear panel quad USB stack Rear panel quad USB stack system board header P150 system board header P150 USB 1.1 #5 USB 2.0 #2 Data 8P, 8N Data 9P, 9N Rear panel quad USB stack Rear panel quad USB stack Front panel USB Front panel USB USB 1.1 #6 USB 2.0 #2 Data 10P, 10N Rear panel dual USB stack w/RJ-45 Data 11P, 11N Rear panel dual USB stack w/RJ-45 Not used Not used 5.8.1 USB Connector These systems provide type-A USB ports as shown in Figure 5-7. 1 2 3 4 Figure 5-8. Universal Serial Bus Connector (as viewed from rear of chassis) Technical Reference Guide www.hp.com 5-11