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If Windows XP Professional detected your modem automatically, it assigned it to an available serial communications (COM) port. If you want to force the COM port assignment, select the available port here. For example, if you have three serial devices that are never used simultaneously, you can change the port settings and have all three devices share the same serial port.

Click Change Default Preferences to modify the default settings for call handling and data connection preferences. Table 26-8 describes the available settings.

Clear the Prompt For Phone Number check box G I have a number of connection problems on a regular basis If you have a number of connection problems, including dropped connections, you might need to use some additional initialization commands for the modem See your modem s documentation for details Also, try opening Phone And Modem Options in Control Panel, select the Advanced tab, click the Advanced Port Settings button, and adjust the FIFO buffer settings If none of these suggestions work for you, it s possible there might be a fundamental incompatibility between your modem and the ones being used by your ISP Contact your ISP for recommended modem brands as well as tips on how to make your modem connect properly to the ISP s modem..

Description Change the number of minutes listed in the Disconnect a call if idle for more than x minutes field if there is no activity on the line for example, increase the number if you want to stay connected to a computer bulletin board even though there is no activity. Change the number of seconds listed in the Cancel a call if not connected within x secs field if it takes a long time to make a connection for example, this might occur when you are making an international call and there are long delays before the call is connected. Determines the speed of the flow of data from the modem to the serial port. The speed is normally set correctly during modem installation; however, some modems can transfer data at a rate faster than the 115.2 Kbps supported by the standard serial ports for most computers. For more information, see your modem documentation. Enables error correction, allowing your modem to negotiate the error correction that is to be used for a communications session with another modem. Available error correction protocols are V.42, MNP4, MNP3, MNP2, or None.

26:

Description Select Enable to allow hardware-based compression. Compression boosts transmission speeds by compressing data between the modems. This feature is available on most modems. When it is enabled, modems sometimes have trouble connecting. If this occurs, select Disable and try again. Using modem compression can sometimes reduce performance if the data being sent is already compressed by the application. Select Hardware for all external modems to avoid loss of data. If your modem cable has RTS (Request To Send) and CTS (Clear To Send) wires connected, you can use hardware flow control; otherwise, select None to use software flow control.

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Default hardware settings can be changed by selecting the Advanced tab of the Default Preferences dialog box. With hardware settings, connection settings usually correspond to what the computer on the other end is using. Therefore, do not change connection settings by using Phone and Modem Options. Rather, use a specific tool or application, such as HyperTerminal, to change these settings connection by connection. Preferences include Data bits, Parity, Stop bits, and Modulation. For information about these values, see Windows XP Professional Help and Support Center. If you have installed an external ISDN modem, an additional ISDN tab appears in the Phone and Modem Options dialog box. The ISDN settings must be configured before the modem can be used.

Windows XP Professional provides built-in support for ISDN. Before configuring ISDN on a computer running Windows XP Professional, you need the following: