Article ID: 253004
Article Last Modified on 1/27/2007
APPLIES TO
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional Edition
- Microsoft Windows 98 Standard Edition
This article was previously published under Q253004
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.
CAUSE
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).
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 Device Manager Does Not Display Devices Not Currently Present
234312 Error message: The Hub Doesn't Have Enough Power Available...
242062 General USB Troubleshooting in Windows 2000
Additional query words: host controller
Keywords: kbenv kbprb KB253004
