Supporting Modems in VB.NET

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Supporting Modems
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Analog modems connect a computer to a remote device by using the Public Switched Telephone Network (PSTN). Modems are used to connect to the Internet through an Internet service provider (ISP) or to connect to a remote private network, such as a cor porate network. A modem can be either an internal or an external device. Internal modems connect to one of the computer s internal expansion slots. External modems connect to one of the computer s serial or USB ports. You can manage modems through the Phone And Modem Options tool in Control Panel and through Device Manager. In Control Panel, select Printers And Other Hardware, then select Phone And Modem Options. In the Phone and Modem Options dia log box, on the Modems tab, double-click a modem to open a modem s Properties dialog box, as shown in Figure 7-7. The Properties dialog box allows you to control speaker volume for the modem or disable modem sound entirely. This is actually a common request from users who do not like hearing the modem sounds every time they connect to the Internet. The Maximum Port Speed controls how quickly communications programs are permit ted to send information to the modem. This is not the same as the modem s connection speed, which is negotiated when the modem dials out and establishes a connection. The maximum port speed is generally configured during installation and does not need to be reconfigured to match the modem s connection speed. The Wait For Dial Tone Before Dialing check box is enabled by default. The telephone systems of some countries do not use a dial tone, in which case this option must be dis abled or the modem will never dial.
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7-16
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7
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Supporting Display Devices, I/O Devices, and ACPI
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Figure 7-7
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Configure general modem properties on the Modem tab.
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The Diagnostics tab of the modem s Properties dialog box, shown in Figure 7-8, lets you query the modem to see if it can respond to standard modem commands. When you are troubleshooting, this is a useful way to determine whether the modem is initializing and functioning correctly.
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Figure 7-8
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Troubleshoot modems using the Diagnostics tab of a modem s Properties dialog box.
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During installation, Windows XP often installs a standard modem driver rather than the specific driver for the modem. This happens in cases where Windows cannot find a device-specific driver. The standard modem driver provides basic functionality but does not support advanced modem features. You can use this driver temporarily until you obtain the appropriate driver from the manufacturer.
Lesson 2
Configuring and Troubleshooting I/O Devices 7-17
USB Devices
Universal serial bus (USB) is a type of connection developed to provide a fast, flex ible method of attaching up to 127 peripheral devices to a computer. USB provides a connection format designed to replace the computer s traditional serial-port and paral lel-port connections. The term universal indicates that many kinds of devices can take advantage of USB. USB is fully Plug and Play compliant. The USB system comprises a single USB host and USB devices. The host is at the top of the USB hierarchy. In a Windows XP environment, the operating system and the hardware work together to form the USB host. Devices include hubs, which are con nection points for other USB devices and nodes. Nodes are end devices such as print ers, scanners, mouse devices, keyboards, and so on. Some nodes also function as hubs, allowing additional USB devices to be connected to them. You can connect USB peripherals together by using connection hubs that allow the bus to branch out through additional port connections. A practical USB desktop connection scheme is presented in Figure 7-9. In this example, some of the peripheral devices are simply devices, whereas others serve as both devices and connection hubs. The com puter provides a USB host connection that serves as the main USB connection.
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