4 Types of Communication Devices

ByShahzad Ahmad

If you are searching to learn about different types of communication devices with their applications, functions, and examples. Then you just need to read the following description. Let’s read it.

Communication devices

The hardware used to transmit data, instructions, and information between a sending and receiving device is called a communication device.

Some important communication devices are as follows:

  • Modem
  • ISDN & DSL Modems
  • Cable Modem
  • Network Interface Card

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Modem

Modem stands for modulation and demodulation. A modem is a device that switches digital signals into analog and analog signals into digital. Modem forwards and accept data from one computer to another using telephone lines.

It is necessary that both the sending and receiving computer must hold modems.communication devices Modulation is a procedure or method of converting the digital signal into an analog signal. The computer saves data in digital form.

The data is converted from digital to analog form because the modem transmits data using a telephone line. Demodulation is the process of converting the analog signal into a digital signal.

The receiving computer’s modem receives data in analog form. This analog data is then translated back into digital format to be used by the computer.

Features of Modem

Some important features of modem are as follows:

  • Speed: The time at which the modem can send data in bps. The speed of the modem is normally from 300 bps to 56 kbps.
  • Self-Testing: Modem also examines the digital connection with the computer. It also checks the analog connection with the remote modem.
  • Voice over Data: when data is being transmitted modem also offers the service of a voice conversation. This attribute must exist in both the source and destination modems.
  • Error Control: For the purpose to control errors for transmitted data, modems use various techniques.
  • Synchronous or Asynchronous Transmission: modems can transmit data in synchronous and asynchronous modes. But normally data is transmitted in asynchronous mode.

Types of Modems

Different types of dial-up modems are as follows:

  • External Modem
  • Internal Modem
  • Wireless Modem

External Modem: it is a stand-alone device that is attached to a serial port such as RS-232 on a computer with a telephone line.