USB Device Is Not Listed Under USB Controller Bandwidth Usage

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This article was previously published under Q253004

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SYMPTOMS

Some Universal Serial Bus (USB) devices (for example, modems) may not be displayed in the Bandwidth area on the USB controller's Advanced tab in Device Manager.

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This behavior occurs because modems are considered bulk items and do not report any bandwidth requirements to the operating system. Because the device does not report any bandwidth requirements, it is not listed in the Bandwidth area.

NOTE: The device should still be displayed in the USB hub properties (on the Power tab in Device Manager).

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MORE INFORMATION

Bulk devices use bandwidth only from "system reserved." They do not have individual requirements.

For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:

241257 (http://support.microsoft.com/kb/241257/EN-US/ ) Device Manager Does Not Display Devices Not Currently Present

234312 (http://support.microsoft.com/kb/234312/EN-US/ ) Error message: The Hub Doesn't Have Enough Power Available...

242062 (http://support.microsoft.com/kb/242062/EN-US/ ) General USB Troubleshooting in Windows 2000

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