What equipment is necessary when two computers use telephone lines to transmit data signals?

When two computers use telephone lines to transmit data signals, the necessary equipment is a "modem". A modem translates a computer's digital signals into analog signals that can be sent along an ordinary telephone line. These analog signals can then be received by another modem at the other end of the line and translated into a language that the computer can understand.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

When two computers use telephone lines to transmit data signals, the necessary equipment is a "modem".

Telephone lines transmit analog signals, and the modem can translate the computer's digital signals into analog signals that can be transmitted along ordinary telephone lines, and these analog signals can be transmitted by the other end of the line. Another modem receives it and translates it into a language that the computer can understand.

Modem is the abbreviation of Modulator and Demodulator. It is called modem in Chinese. According to the homophony of Modem, it is affectionately called "cat". It is a kind of device that can realize Electronic equipment with modulation and demodulation functions required for communications. Generally consists of modulator and demodulator. At the sending end, the digital signal generated by the computer's serial port is modulated into an analog signal that can be transmitted through the telephone line; at the receiving end, the modem converts the analog signal input into the computer into a corresponding digital signal and sends it to the computer interface. In personal computers, modems are often used to exchange data and programs with other computers, as well as to access online information service programs, etc.

The so-called modulation is to convert digital signals into analog signals transmitted on telephone lines; demodulation is to convert analog signals into digital signals. Collectively called a modem.

The English name for modem is MODEM, and its function is the "translator" of analog signals and digital signals. There are two types of electronic signals, one is "analog signal" and the other is "digital signal". The telephone lines we use transmit analog signals, while the PCs transmit digital signals. So when you want to connect your computer to the Internet through a phone line, you must use a modem to "translate" two different signals. After connecting to the Internet, when the PC sends information to the Internet, since the telephone line transmits analog signals, a modem must be used to "translate" the digital signals into analog signals before they can be transmitted to the Internet. This process is called "modulation" ". When the PC obtains information from the Internet, since the information transmitted from the Internet through the telephone line are all analog signals, if the PC wants to understand them, it must also use the "translation" of the modem. This process is called "demodulation" . Generally speaking, it is called "modulation and demodulation".

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