What is modem and how many types are there?

You must have heard Modem's name before. But do you know in the right form what Modem is, how does it work? By the way, through a modem you can connect your computer with the available Internet connection through the existing telephone line. Like NIC, Modem is used to integrate with the computer motherboard. Rather it is available as a separate part which can be installed in PCI slots which you can find in the motherboard.

By the way, a modem is not required much in LAN, but they are needed in other internet connections like dial-up and DSL. There are many types of modems that differ from each other in Speed ​​and Transmission rate. Standard PC modem or dial-up modems have (56Kb data transmission speed), Cellular modem (which are used on the laptop and enable it to connect at the same time), cable modem (which is 500 times is faster than standard modem) and DSL Modems are also very popular. So today I thought that why should you people explain what Modem is in Hindi, so that you people do not need to find somewhere else about it. Then let's start without delay.

The full form of the modem is "Modulator / Demodulator." It is a hardware component that allows a computer or other device, such as a router or switch, to connect to the Internet. It converts or "modulates" an analog signal from a telephone or cable wire to a digital signal that a computer can easily recognize. Similarly, it converts outgoing digital data into analog signal in a computer or other device.

Who invented the asphyxia modem? In 1962, the first commercial modem was manufactured and sold by AT&T as the Bell 103. Earlier modems used to be "dial-up," meaning that they have to dial a phone number to be connected with the ISP. These modems operate in standard analog phone lines and also use the same frequencies as telephone calls, which limits their data transfer rate to a maximum of 56 Kbps. Dial-up modems also require full bandwidth of the local telephone line, which means that voice calls can interrupt your internet connection.

Modern modems are typically DSL and cable modems, also called "broadband" devices. DSL modems operate over standard telephone lines, but use a wider frequency range. They allow for higher data transfer rates if we compare it with dial-up modems and also they do not interfere with phone calls.

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Cable modems send and receive data in standard cable television lines, which are typically coaxial cables only. Most modern cable modems support DOCSIS (Data Over Cable Service Interface Specification), which provides an efficient way to easily transmit TV, cable Internet, and digital phone signals into the same cable line.

NOTE: Since a modem converts analog signals into digital and vice versa, they require ADC or DAC. Modems are not required in fiber optic connections as signals are transmitted digitally from start to finish.

How does modem work?

As we know that Modem has full form Modulator - Demodulator. Modems are used to transfer data from one computer network to another computer network. In this, data transfer is done by telephone lines. Although the computer network works in digital mode, the analog technology is used to send messages across the phone lines.

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The modulator converts information from digital mode to analog mode at the transmitting end and the same demodulator converts the same information from analog mode to digital mode at the receiving end. Digitizing is the process in which analog signals of a computer network are converted into digital signals in another computer network.

When an analog facility is used between two digital devices for data communication then they are called Data Terminal Equipment (DTE), modems are used at both end. In such a situation, DTE can be either a terminal or a computer.

The modem that is present at the transmitting end converts the digital signal generated by DTE into Analog Signal, for which it modulates the bus carrier. The modem that is present at the receiving end demodulates the carrier and then later that demodulated digital signal is hand over in DTE.