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Host controller Also known as the root, the root tier, or the root hub, the host controller can be built into the motherboard of the computer or installed as an add-in CardBus or PCI card in the computer to gain additional ports and bandwidth. The host controller controls all traffic on the bus and also functions as a hub. Hub Provides multiple ports, for attaching devices to the USB bus. Hubs are also responsible for detecting devices that are plugged in or unplugged, and for providing power for attached devices. Hubs are either bus-powered, drawing power directly from the USB bus, or self-powered, drawing power from an external AC adapter. Bus-powered hubs are capable of providing 100 milliamperes (mA) of power per port for attached devices, and they can provide a maximum of four ports for devices to be plugged into. Self-powered hubs, on the other hand, typically provide 500 mA of power per port, and they can provide more than four ports. Hubs can be stand-alone devices, or they can be integrated into other devices such as keyboards and monitors. Device A USB device, which is attached to the bus through a port. A USB device can be any kind of peripheral device, such as a keyboard, mouse, game controller, printer, and so forth. Certain USB input devices such as keyboards and mice require only 100 mA of power to function. Thus, they can be plugged into both bus-powered and self-powered hubs, in addition to being plugged directly into a root port. Other devices such as print-

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Part II:

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

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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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:

The controls we need are installed at this point We can create a new URL object for the XML document we want read in when the user clicks the Click Me button: import javaawt*;

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

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