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ers, scanners, storage devices, and video-conferencing cameras might require 500 mA of power to function. These kinds of devices can only be plugged into root ports or selfpowered hubs. If the device requires more than 500 mA of power, it includes a wall plug provided by the vendor for power.
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A USB device typically implements a single function, as a keyboard or mouse does. However, a USB device can also implement multiple functions, such as scanning, printing, and faxing. When such a multifunction device, or USB composite device, is plugged in, the operating system enumerates all the functions in the device and loads device drivers for each function. A USB device might also include a built-in hub to enable additional devices to be plugged into it. Such a device is known as a USB compound device. Each USB device contains configuration information that describes its capabilities and resource requirements. This information is read from the device by the operating system during the enumeration process. USB devices are recognized, initialized, and ready for use when plugged in. No additional installation or configuration steps are necessary. Windows XP Professional features built-in support for USB device types, including integrated USB 2.0 support beginning with SP1, such as:
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Hubs Uninterruptible power supply (UPS) devices Input devices, such as keyboards, mice, and other pointing devices Game controllers, such as joysticks and game pads Printers Storage devices, such as hard disk drives, CD-ROM drives, high-density disk drives, and compact flash readers Speakers and microphones Scanners Still image cameras Video-conferencing cameras (also known as webcam cameras) Modems USB-to-Ethernet network adapters
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9:
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Windows XP Professional supports only devices that are compliant with applicable USB device class specifications as developed and published by the USB Implementers Forum. For more information about USB specifications, see the USB link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources. The only exception to this rule is USB-to-Ethernet adapters, which must be compliant with the Microsoft Remote Network Driver Interface Specification (Remote NDIS) to benefit from built-in support in Windows XP Professional. For more information about Remote NDIS, see the Remote NDIS link on the Web Resources page at http://www.microsoft.com/windows /reskits/webresources.
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Data Transfer Types and Rates Supported by USB
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USB supports two different data transfer modes: isochronous and asynchronous modes. Asynchronous mode uses three asynchronous data transfer types: interrupt, control, and bulk. Isochronous mode uses the isochronous transfer type. The USB host controller determines the data transfer rate and the priority assigned to a data stream. USB supports the following maximum data transfer rates, depending on the amount of bus bandwidth a device requires:
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1.5 megabits per second (Mbps) for low-speed devices that do not require a large amount of bandwidth, such as mice and keyboards 12 Mbps for full-speed, higher-performing, such as storage devices, speakers, scanners, and video cameras 400 Mbps for high-speed devices, higher-performing devices, such as hard drives, CD, and DVD drives that support the USB 2.0 specification
Asynchronous transfer mode An asynchronous transfer employs a handshake system and allows data streams to be broken at random intervals. The three asynchronous data transfer types are described as follows. Interrupt Interrupt transfers reserve bandwidth and are guaranteed access to transfer data at the established rate. They are used when a device transfers unsolicited data to a host. Control Control transfers are used to service devices and to handle specific requests. They are typically used during device configuration. Bulk Bulk transfers are used to transfer large blocks of data that have no periodic or transfer rate requirement. Printers and storage devices typically deploy bulk transfers. Isochronous transfer mode An isochronous transfer requires a constant bandwidth within certain time constraints. Constant bandwidth is required to support the demands of streaming multimedia devices such as speakers or video cameras. Unlike asynchronous transfers, no handshaking occurs and data delivery is not guaranteed.
Part II:
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