Change the maximum modem port speed

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

To change the maximum modem port speed

  1. Open Phone and Modem Options in Control Panel.

  2. On the Modems tab, click the modem that you want to configure, then click Properties.

  3. On the Modem tab, in the Maximum Port Speed list, click the speed for the modem.


  • To perform this procedure, you must be a member of the Administrators group on the local computer, or you must have been delegated the appropriate authority. If the computer is joined to a domain, members of the Domain Admins group might be able to perform this procedure. As a security best practice, consider using Run as to perform this procedure.

  • To open a Control Panel item, click Start, click Control Panel, and then double-click the appropriate icon.

  • This value is usually set correctly when the modem is installed.

  • This speed represents the maximum speed programs are allowed to transmit data to the modem and is normally faster than the modem speed. For example, this is usually set to 57,600 bps for a 33.6 Kbps (V.34) modem.

  • Changing this setting also sets the current speed for the modem. To set a different value for the current speed, see Related Topics for the procedure to change the data connection preferences.

Information about functional differences

  • Your server might function differently based on the version and edition of the operating system that is installed, your account permissions, and your menu settings. For more information, see Viewing Help on the Web.

See Also


Change hardware settings
Change data connection preferences
Designate hardware or software compression
Improving modem throughput speeds
Attaining fast speeds with a 56 Kbps modem
Optimizing data transfer speed
Data transfer speed