What is Modem? Working, Features and Different Types of Modem

what is modem

In this article, I am going to tell you what is Modem? How modem works and its different types. The modem is very important for any network communication. We use Modem in our daily life. It’s a part of the communication system.

If you are using the internet for a lot of years, you would know that the modem was coming separately and the router had to buy separately. And a few years ago if there was a phone line in your house, then he was also used for Internet connection. A modem was added to your landline and thus could use the internet. And one coaxial cable was also used which can also be used by the set box, using the Internet, through a modem.

So, today I will try to tell what is Modem and some of its typical details.

What is Modem?

The Modem word is made up of two words which are called modulator and demodulator. So, basically, Modulator means that it converts digital signals into analog signals and send it over telephone lines. So, the process of converting these signals is called Modulation.

And Demodulator means that receiving modem converts analog signals into digital signals is called as Demodulation.

Working of Modem

Let’s assume we have a computer ‘A’ and another computer is named computer ‘B’. If the computer ‘A’ or ‘B’ wants to send messages to one another it requires a medium which is provided by our telephone cables.what is modem

For a message from computer ‘A’ to reach the computer ‘B’ is through a series of connection that is from computer ‘A’ to telephone ‘A’ and then the telephone cables which will be received by telephone ‘B’ and then to the computer ‘B’.  But there’s a problem in this continuity of the serial connection and the problem is once you typed the message saying ‘Hi! This is Trendinwire’. The computer will convert and send the messages in the form of 0’s and 1’s which is the one language that the computer knows that is the binary language.

what is modem

But the telephone cannot understand the binary language because it sends and receives the messages only through the analog signals. Those analog signals cannot be understood by the computer. So, obviously what we want is a translator named as a ‘Modulator’ which converts the binary language into analog signals.

what is modem

Apart from the problem has been solved, now the messages can be successfully sent from a computer to a telephone with the help of the modulator. The telephone sends the messages to another telephone in the form of analog signal. And the next problem lies here. We require another kind of black box to demodulate the analog signals to binary languages is “Demodulator”.what is modem

Now, the message can be successfully sent from computer ‘A’ to computer ‘B’. But, it’s just a one-way communication we cannot get the reply. In order to get the reply, we have to set the whole setup from ‘B’ to ‘A’. A modulator between computer ‘B’ and telephone ‘B’ analog signals from telephone ‘B’ to telephone ‘A’. Demodulate between telephone ‘A’ to computer ‘A’. As time passes modulator and demodulator combined together to form a single box named “Modem”. Now, we can send and receive messages and it became two-way communication. Everything became possible with the help of the one and only “Modem”.

After knowing what is Modem and it’s working, let’s know the some its features.

Some Important Modem Features

  • It helps us to transmit data from one computer to another computer using standard telephone lines.
  • Transmission Rate: It includes how many bits per second a modem can transmit or receive.
  • Speed: The speed of modem is determined by the modulation and demodulation standard.
  • The rate at which a modem converts digital signals into analog signals and sends them over transmission media and modem converts analog signals into digital signals is called modem speed.
  • It is measured in bits per second (bps).
  • Different modems have different speeds like 2400 bps, 9600 bps, 56.5 kbps.
  • Self Testing: Modem can test the computerized association with PC and simple association with the remote modem.
  • Voice over Data: It has the facility of voice conversation while data being is transmitted.
  • Error Control: It has the facility of voice discussion while information being is transmitted

Types of Modem

The modem is divided into 3 parts according to size and shape. The first one is External Modem, the second one is Internal Modem and the last one is Wireless Modem. These are the three modems we use and it is connected to different computers with different ports.

So now let’s start with External Modem,

1. External Modemwhat is modem
  • An external modem is connected to the PC framework with the assistance of COM1 or COM2 ports.
  • It is connected to the telephone wall jack by another cable.
  • An external power is supplied to it.
  • It is very easy to set up.
2. Internal Modem

what is modem

  • An Internal Modem is a circuit board that can be attached inside the system through expansion slots.
  • It cannot be moved easily from one PC to another PC.
  • Its setup is difficult.
3. Wireless Modem
  • Wireless modems transmit data through the air ( using unguided media ) instead of cable (guided media).
  • It is also called radio frequency modem.
  • These are designed to work with cellular technology and wireless signal area network.
  • These are not yet perfected but the technology is rapidly improving.

Also Read: What is Firmware? Application, Differences, Security and Warning Signs


So. these are the types and features of Modem. I also explained what is modem? I hope, you understood now that what is Modem and how it works? If you think that it informative and useful than share with others.

About Manoj Prasad

Manoj Prasad is the founder of Trendinwire. Manoj is interested in science and tech subject. He is also interested in learning new things. He wants to share whatever he learned with the world.

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