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In Phone and Modem Options, you can globally change default modem settings for all communications applications and tools created for Windows XP Professional. For example, if you do not want to listen to the modem speaker, you can turn it off for all tools and applications that use that modem. You can also adjust these settings individually within each application. Note

For Microsoft Windows 3.1 based or Microsoft MS-DOS based applications, you need to configure the modem settings within each application.

To view general properties for a modem 1. In Control Panel, click Phone and Modem Options. 2. Select the Modem tab. 3. Select the modem or device you want, and then click Properties. Modem settings are listed on the General, Diagnostics, and Advanced tabs. Table 26-5 describes the General settings.

Figure 4-13.

Description A port is either a COM port or an LPT port to which an external modem is attached, or it is a COM port name that identifies an internal or PCMCIA modem. Windows XP Professional automatically assigns a port name (COM1, COM2, COM3, or COM4) to any device it detects. Usually, the port name is adjusted only if you move an external modem from one COM port to another. For PCMCIA modems, the port cannot be changed. Sets the volume for the telephone speaker, which broadcasts the dial tone, modem connection, and voices, if applicable, on the other end. To change the volume, move the slider bar to the right or left. Sets the speed at which Windows XP Professional communicates with the modem. It is limited by the central processing unit (CPU) speed of the computer and the speed supported by the communications port. Windows XP Professional selects a conservative default speed so that slower computers do not lose data during transfers. You can set the speed lower if the faster rate causes data errors. Set it higher for faster performance. For example, 57,600 might work better than the Windows XP Professional default setting of 38,400 for v.32bis (14,400 bps) modems on fast computers. If applications report data errors, set a lower speed. (For example, change it from 38,400 to 19,200 for v.32bis modems.)

Clear the Wait for dial tone before dialing check box if you are making calls from a country or region other than where your modem was purchased and your modem fails to properly detect the dial tone.

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If you have a slower computer and an external modem, you can install a 16550A Universal Asynchronous Receiver/Transmitter (UART) based COM port adapter to increase speeds. Some internal modems have an integrated 16550A UART adapter.

invoices, purchasing, and inventory. To summarize all these areas, let s take a look at the Product, OrderHeader, and OrderDetail tables, as shown in Table 8-1, Table 8-2, and Table 8-3, respectively. Column Name ProductID (PK) ProductNumber Name Description Photo Price Taxable

The Diagnostics tab provides hardware information that can be used in hardware configuration and problem determination. Table 26 -6 describes the Diagnostics settings.

The options on the Security and Networking tabs typically apply to dial-up connections to a corporate network, such as a VPN connection, although some ISPs are now requiring secure authentication methods. You can learn more about the configuration options on the Security tab in 20, Using Security, and the configuration options on the Networking tab in Configuring IP Settings in Windows XP, page 35, as well as in Other Networking Protocols, page 42.

Description Displays manufacturer-specific information identifying the modem. Click Query Modem to display your modem s responses to standard AT commands sent to it. This information can be used to assist in troubleshooting. Windows XP Professional records commands and responses to and from the modem in the Modemlog.txt file in the Windows folder. If the box is not checked, Windows XP Professional erases the old log and records a new log at the beginning of each call. If the check box is selected, Windows XP Professional appends new call logs to this file. The modem log is a powerful tool for diagnosing problems, particularly with connection problems. However, the interpretation of the contents of the file requires modem documentation, technical support, or experience with modems. The problems diagnosed might be in the local modem, its configuration, the telephone system, the remote modem (for example, the Internet service provider [ISP]), or in some combination of these items.