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Electrical surge on hub port Either a device attached to the port or the port itself has drawn more current than allowed, and the hub turned off the port. The port will not function correctly until you reset it. If the device is the cause, it must be detached before resetting the port. To reset the port, disconnect the device, and then click Reset in the dialog box. If the port is the cause, close the dialog box, and do the following to reenable the port: 1. Disconnect the hub. 2. Re-attach the hub. 3. If it is the root hub, unplug all attached USB devices from the computer, and (if they have power supplies) unplug them from the electric supply. After a few moments, reconnect the devices. The computer can be restarted at any time.

USB hub port power exceeded A device that requires more than 100 mA has been plugged into a bus-powered hub that can supply only 100 mA to each of its ports. The device will not work until it is plugged into a self-powered hub, or into a root hub, that supplies 500 mA to each port. Disconnect the problem device, and reconnect it to an unused port that meets its power requirements. (The error dialog box lists the appropriate port in boldface type.)

G Security is localized. Because there is no server, logon security is imple-

9:

USB host controller bandwidth exceeded A device request for allocation of bandwidth has failed because the USB host controller is in full use and has no spare bandwidth. Typically, devices support several settings at various levels of bandwidth. A device tries to allocate the highest bandwidth, progressively metering itself back after each bandwidth allocation fails. Repeated requests trigger an error condition. It is recommended that you close some applications that are using USB devices that use bandwidth. In Device Manager, you can view the property page for the host controller to see bandwidth status. Pressing Refresh in the dialog box after making any changes updates bandwidth data to show whether bandwidth is freed.

Maximum number of hubs surpassed Six or more USB hubs are linked in a chain, and the USB specification allows a maximum of five. It is recommended that you remove the most recently connected hub and connect it to a port that is highlighted on the tree view list in green (signifying that it is free and recommended). Device enumeration failure A device is plugged into a USB port, but the operating system does not recognize the device. The failure can have various causes. For example, the device might not initialize properly when it is plugged in, or the device driver might be faulty. If the cause is not a permanent malfunction in the physical device, unplugging the device and plugging it in again might allow it to enumerate properly. Identical serial numbers The serial number in a device, if it exists, must be unique for each device that shares the same USB Vendor ID and Product ID. Occasionally hardware vendors mistakenly program devices with identical serial numbers. When two or more USB devices with identical serial numbers are plugged into the same system, only the first one plugged in functions. For further assistance, contact the hardware vendor.

mented on a computer-by-computer basis. The good news is that Windows XP provides local logon security, which makes Windows XP a better choice for workgroups than Microsoft Windows 9x or Microsoft Windows Me (Millennium Edition).

Three Types of Applications: What s the Difference Getting Started with the IDE Building the Projects Building a Console Application Getting to Know Solution Explorer

For more information about the USB standard, see the USB link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources. For more information about troubleshooting USB, see the Microsoft Knowledge Base link on the Web Resources page at www.microsoft.com/windows/reskits/webresources. Search the Knowledge Base by using the keywords USB and USB troubleshooting.

Although IEEE 1394 devices are generally reliable, problems do arise with these devices, often when changes are made to the system. The following suggestions for troubleshooting IEEE 1394 devices can help to solve hardware problems:

When installing PCI IEEE 1394 adapters, refer to the troubleshooting options listed in Table 9-5 earlier in this chapter. Some manufacturers provide IEEE 1394 controllers that are integrated into the motherboard, while others offer them as optional components. Follow the manufacturer s installation instructions. Some IEEE 1394 hardware installations require that you run a setup program before plugging the device into your computer.