Computer May Stop Responding or Experience Slow Download Times with Universal Serial Bus Modem

ID: Q240947

The information in this article applies to:

Microsoft Windows 98 Second Edition

SYMPTOMS

When you perform large file transfers over Universal Serial Bus (USB) modems using communications device class (CDC) compliant USB drivers in Windows 98 Second Edition, throughput speed may decrease. In addition, the computer may stop responding (hang) after a few minutes.

CAUSE

Interactions between the virtual communications device (Vcomm.vxd) and the Windows Driver Model (WDM) modem port driver (Ccport.sys) can cause the system to abandon successive timer events. The computer may hang when it attempts to handle these events.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:


   Date       Time     Version     Size     File name
   -----------------------------------------------------
   10/04/99   04:21p   4.10.2223   37,680   Ccport.sys
   10/04/99   04:33p   4.10.2223    7,789   Wdmmdmld.vxd

STATUS

Microsoft has confirmed this to be a problem in Windows 98 Second Edition.

MORE INFORMATION

This issue is known to affect the following products:

3Com OfficeConnect 56K Business Modem

Compaq 56K USB Fax Modem

3Com ISDN TA Terminal Adapter

You may also be able to resolve this issue by obtaining an updated driver for your 3Com modem from the following 3Com Web site:

http://consumer.3com.com/isdnta/inf/index.html

The third-party contact information included in this article is provided to help you find the technical support you need. This contact information is subject to change without notice. Microsoft in no way guarantees the accuracy of this third-party contact information.

The third-party products discussed in this article are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: orphan

Keywords : win98se
Version : WINDOWS:98 Second Edition
Platform : WINDOWS
Issue type : kbbug