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Desktop Management
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USB Support for Plug and Play
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Windows XP Professional supports Plug and Play configuration of USB devices by using the following USB features. Hot plug-in capability You can plug a USB device into the system at any time. The USB driver stack enumerates the device and notifies the system that the device is present. Persistent addressing USB devices use descriptors to identify the device, its capabilities, and the protocols it uses. A device descriptor contains a Vendor ID (VID), a Product ID (PID), and a version number that tell the computer exactly which drivers to load. An optional serial number differentiates one device from another of the same type. Power options USB supports three power modes: On, Suspend, and Off.
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User Interfaces for USB Device Properties
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Windows XP Professional provides user interfaces to display relevant information about the status of USB devices. The information provided by the USB user interface in Device Manager provides the advanced user with property sheets for hubs and controllers that give specific USB power and bandwidth information. In addition, an event-driven interface allows error detection and correction by notifying the user about a problem on the bus. The interface provides details about the error and suggests solutions. For information about the USB troubleshooting user interface, see Troubleshooting a Universal Serial Bus Device later in this chapter. For more information about using Device Manager to display device properties, see Device Manager earlier in this chapter. USB Root Hub Power Properties The Power Management tab in the USB Root Hub Properties dialog box displays information about power usage on that hub. The Hub information box indicates the hub type and the amount of power available from each port (determined by hub type). The Attached devices box lists devices attached to the hub s ports and the power each device requires to function. If a device requires more power to function properly than the hub s ports supply, a message notifies the user. The user can view the Device Manager property dialog box for the hub by double-clicking the device. Clicking Refresh updates the information in the dialog box, which shows devices that are attached or removed. USB Host Controller Advanced Properties The USB Host Controller dialog box displays information about bandwidth usage on the USB host controller and gives the user the option of turning off USB error detection. The Advanced tab in the USB Universal Host Controller Properties dialog box shows the bandwidth allocation page. The Bandwidth section of the dialog box describes USB bandwidth and how it pertains to what the user sees displayed on
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9:
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the property page. The list box displays all devices attached to the controller that consume isochronous bandwidth (typically, USB video cameras and USB speakers), along with the bandwidth each takes. To maintain bandwidth for control transfers, the amount of bandwidth reserved by the System Reserved device listing will change, depending on what devices are installed or removed. For every device that consumes one percent or more of the controller s bandwidth, there is a corresponding section in the Bandwidth Used column, which displays cumulative bandwidth usage. However, HID-compliant devices do not display here, although they do cause an increase in the System Reserved percentage. Checking the Don t tell me about USB errors check box and clicking OK disables the display of the USB error detection and correction messages. For more information, see USB User Interface Error Detection later in this chapter. The default state for this button is unchecked.
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IEEE 1394
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Windows XP Professional supports the Institute of Electrical and Electronics Engineers (IEEE) 1394 bus, which is designed for high-bandwidth devices, such as digital camcorders, digital cameras, digital VCRs, and various storage devices. The IEEE 1394 bus is a digital, peer-topeer interface that supports data transport speeds from 100 to 400 Mbps. It provides a highspeed Plug and Play capable bus that reduces the amount of power that peripheral devices require and provides support for isochronous data transfer. IEEE 1394 can connect up to 63 devices to one IEEE 1394 bus and link up to 1023 buses to form a network of more than 64,000 devices. Each device can have up to 256 terabytes of memory available over the bus. A built-in mechanism ensures that all devices have equal access to the bus. Windows XP Professional supports three protocol standards for data transport over the IEEE 1394 bus:
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SBP-2 Protocol Used for block transfer type devices, such as storage devices, scanners, and printers. 61883 Protocol Used with streaming data type technologies, such as networking, digital camcorders, DVD, and audio. Windows XP Professional supports the 61883-1 through 61883-4 protocols. IP over 1394 Protocol Provides high-speed TCP/IP connectivity between PCs and is a good solution for home networking. Windows XP Professional supports IP over 1394 for both IPv4 and IPv6.
Note Microsoft Windows XP Professional x64 Edition only supports the SBP-2 protocol. It does not support the 61883 or IP over 1394 protocols.
Part II:
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