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Historically, most telephone connections in the world have been made by using the PSTN. Most PSTN calls are transmitted digitally except while in the local loop, the part of the telephone network between the telephone and the telephone company s central switching office. Within this loop, speech from a telephone is usually transmitted in analog format. Digital data from a computer must first be converted to analog by a modem. The modem is installed in the computer and connected to the computer by the serial port or by a Universal Serial Bus connection. The data is converted at the receiving end by another modem, which changes the data from audio to its original data form. Windows XP Professional provides basic telephony call support for modems using PSTN lines, such as dialing and call termination. Windows XP Professional provides device drivers for a number of internal and external analog modems, which can be automatically installed by using Plug and Play or manually installed by using the Add Hardware Wizard in Control Panel.

The need for high-speed telecommunications support within the existing telecommunications infrastructure has led to the development of new technologies, such as Integrated Services Digital Network (ISDN). ISDN is a digital phone service that uses existing copper telephone cabling that is provided by regional and national phone companies. To use ISDN, you need either an ISDN modem or ISDN adapter. You might also need an NT-1 (the equivalent of the phone jack into which you plug your device) and an ISDN line from your telephone company. Some ISDN equipment comes with the NT-1 built in. ISDN modems are available in internal and external configurations. Internal ISDN modems are more commonly used and are installed in the same manner as a network adapter. External ISDN modems hook up to your computer by using a serial port, the same as regular modems. Thus, because a serial port cannot exceed 115 kilobits per second (Kbps) (which is lower than the total effective bandwidth of the ISDN line), some throughput is lost if you are using the maximum ISDN bandwidth. An ISDN adapter, which operates at bus speed, provides the higher rate that ISDN needs.

tion has been sent. The stop bit value should be set to 1 unless you are directed to set it to a different value by your ISP.

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The same company that supports the PSTN typically supplies ISDN. However, ISDN differs from analog telephone service in several ways, including:

Data transfer rate Available channels per call Availability of service Cost of service Quality of connection

G Modulation. Modulation refers to how data is changed from digital to ana-

Data transfer rate ISDN can provide data transfer rates of up to 128 Kbps. These speeds are slower than those of LANs supported by high-speed data communications technology, but faster than those of analog telephone lines. In addition to the difference in data transfer rates, ISDN calls can be established much faster than analog phone calls. While an analog modem can take up to a minute to set up a connection, you usually can start transmitting data in about two seconds with ISDN. Because ISDN is fully digital, the lengthy process used by analog modems is not required. Channels PSTN provides a single channel, which can carry either voice or digital communications, but not both simultaneously. ISDN service is available in several configurations of multiple channels, each of which can support voice or digital communications. In addition to increasing data throughput, multiple channels eliminate the need for separate voice and data telephone lines. Availability Cost ISDN is available throughout the United States.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 } } // Methods public virtual void Display() { Console.WriteLine(Name); Console.WriteLine(Address); Console.WriteLine(City); Console.WriteLine(State); Console.WriteLine(ZIP); Console.WriteLine(Country); public class Person { //Data members private string Name; private string Address; private string City; private string State; private string ZIP; private string Country; using System;