Microsoft KB Archive/139952

= Slower Modem Speed Reported After Upgrading Windows =

Article ID: 139952

Article Last Modified on 1/19/2007

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APPLIES TO


 * Microsoft Windows Millennium Edition
 * Microsoft Windows 98 Second Edition
 * Microsoft Windows 98 Standard Edition
 * Microsoft Windows 95
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q139952



If this article does not describe your hardware-related issue, please see the following Microsoft Web site to view more articles about hardware:

http://support.microsoft.com/default.aspx/w98?sid=460



SYMPTOMS
Your 32-bit communications programs may report that they are communicating at a slower speed than your 16-bit communications programs. For example, if your 16-bit programs report that they are communicating at 38,400 bits per second (bps), your 32-bit programs may report that they are communicating at 14,400 bps.



CAUSE
32-bit communications programs that are designed for Windows 95, Windows 98, Windows Millennium Edition (Me), or Windows NT 4.0 report the modem line speed when reporting the speed at which the program is communicating. The modem line speed is the speed between your modem and the modem you are connected to, or the speed at which data is transmitted over the telephone line.

Most 16-bit communications programs that are designed for Windows 3.x report the port speed when reporting the speed at which the program is communicating. The port speed is the speed between your modem and your computer, or the speed between the serial port that your modem is connected to and your computer. The port speed is typically faster than the modem line speed, causing 16-bit programs to report a faster speed than 32-bit programs.



RESOLUTION
The following workaround affects the speed that your communications program reports. It does not affect the speed at which your modem is connected:


 * 1) Click Start, point to Settings, and then click Control Panel.
 * 2) Double-click Modems.
 * 3) Click your modem, and then click Properties.
 * 4) On the Connection tab, click Advanced.
 * 5) In the Extra Settings box, type S95=0, and then click OK.
 * 6) Click OK, and then click Close.



MORE INFORMATION
When identifying the modem speed, the modem line speed is typically used. The modem line speed is also known as the data link speed or data circuit- terminating equipment (DCE) speed. This speed is typically 2400 bps, 9600 bps, 14,400 bps, or 28,800 bps.

The port speed is used instead of the modem line speed to identify the modem speed in some cases. The port speed is also known as the serial port connection speed or data terminal equipment (DTE) speed. This speed is typically 19,200 bps, 38,400 bps, 57,600 bps, 115,200 bps.

Additional query words: HWMODCON w98comfaq

Keywords: kbenv kbfaq kbprb KB139952

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