Knowledge Base

Certain PC Card Modems May not be Detected in Window NT 4.0

Article ID: 159103

Article Last Modified on 11/1/2006

Microsoft Windows NT Workstation 4.0 Developer Edition
Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q159103

SYMPTOMS

Windows NT 4.0 may not detect certain PC Card modems installed in your computer although they are listed in the Control Panel Modems applet. This problem may occur with a variety of PC Card modems, including the ones listed below:

Compaq 144 Data Fax Modem Series 570
Compaq 288 Data Fax Modem Series 571
P.N.B. PCMCIA Rio V34

CAUSE

This problem is related to a timing issue in the PC Card modem detection code of Windows NT 4.0, and may vary from controller to controller and from modem to modem.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem has been corrected in the latest U.S. Service Pack for Windows NT version 4.0. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: pcmcia modem sp2

Keywords: kbbug kbsetup KB159103