Dial-up networking refers to connecting the computer to the Internet through dial-up access. What does dial-up access mean? It means that after setting up relevant software and protocols, the computer is connected to the ordinary telephone line through a normal modem and connects to the Internet service, online service or remote computer.
Dial-up access is the most widely used Internet access method at present. As of the end of 2000, a total of more than 250 million users were dialed. Its number of users is four times that of other popular methods such as broadband digital user dedicated line (DSL), cable modem (Cable Modem), integrated service digital network modem (ISDN Modem).
Dial-up networking uses a modem to connect a stand-alone machine to the network, such as the Internet. The maximum speed of the commonly used modems is 56K. Dial-up access is still the cheapest and most convenient Internet access method at present, but because the access rate is relatively slow, websites with many pictures are opened slowly. Through dial-up access to download data, the factors that can reach the maximum speed are: the analog bandwidth of the telephone system, the quality of the telephone line, and the busyness of the network. Dial-up access is usually interconnected with an Internet Service Provider (ISP) using a point-to-point protocol.
Broadband access services such as digital subscriber dedicated lines (DSL), cable modem and satellite access to the Internet are rapidly being launched in more and more areas. However, dial-up users are still growing. It is predicted that in terms of winning users, wireless access will become the biggest competitor of dial-up access in the future. But analysts predict that by the end of 2001, the number of dial-up users will be more than twice as many as broadband users. By 2003, the gap will narrow, but the number of dial-up users will still be the largest, 1.5 times that of broadband users.
Dial-up access is the easiest way to access the Internet. After the user applies for an account from the Internet Service Provider (ISP), he or she only needs to connect the modem to the telephone line to access the Internet. In most cases, the Windows operating system has built-in corresponding tool software. Regardless of the method, dialing users usually only need to enter the user name, password and ISP's phone number in the dialog box. The dialing program uses this information to connect to the Internet Service Provider (ISP) and completes the remaining access work. After the basic settings are completed, most users only need to do to establish a connection by double-clicking the icon.
When dialing for the Internet, the dial-up network software will operate the modem on the user side to dial out the phone number of the ISP (Internet service provider). After a few seconds, the modem on the remote side responds. After confirming a series of commuting signals, the connection speed is "agreed". When the modem on the local side is connected to the ISP, it will make a familiar whistle sound. The modem on the ISP side selects the connection speed according to the connection situation. After establishing the connection, the Modem speaker stops ringing. The dial-up network uses CHAP (inter-disk handshake confirmation protocol) to send usernames and passwords to the ISP. The computer on the ISP side checks the usernames and passwords through the customer database. Once the user information is recognized by the ISP, the status window of the dial-up network disappears. At this time, you can surf the Internet, send and receive emails, download files, etc. The entire dial-up Internet access process takes 30 seconds to 2 minutes.
Article entry: dnbm Editor: dnbm