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Change the Maximum Modem Port Speed

Updated: February 7, 2008

Applies To: Windows Server 2008

You can use this procedure to set the maximum speed at which the computer can communicate with the modem. Generally you want the computer to transmit to the modem at the fastest speed at which the modem can receive the data. This is normally faster than the modem can transmit on the phone line.

Membership in the local Administrators group, or equivalent, is the minimum required to complete this procedure.

  1. In Control Panel, click Hardware and Sound, and then click Phone and Modem Options.

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

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

  • 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 bits per second (bps) for a 33.6 kilobits per second (Kbps) V.34 modem.

  • By default, this setting also specifies the current speed for the modem. To set a different value for the current speed, see Change Data Connection Preferences.

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