Computer Networking

Transport Layer

Data Transmission Modes

The way in which data is transmitted from one location to another is called data transmission modes. There are three types of data transmission modes.

1. Simplex mode

  • In Simplex mode the communication is unidirectional. Unidirectional means the flow of data is in one direction.
  • A device can only send the data but cannot receive it as Antenna sends the signals to TV but cannot receive signals from TV.
  • Another example is Keyboard and Monitor. As keyboard is used to send values to monitor but monitor can’t send back.

Advantage of Simplex Mode

  • It utilizes the entire bandwidth so that maximum data can be transmitted at a time.

Disadvantage of Simplex Mode

  • As Communication is unidirectional, so there is no inter-communication between devices.

3. Half duplex

  • In Half-duplex mode the communication is bi-directional. Message can flow in both directions but not at the same time in both directions.
  • In half-duplex mode, the data can retransmit because if any error occurs then the receiver requests the sender to retransmit it.
  • For example Walkie-talkie. In Walkie-talkie, one person speaks, and another listens. After a pause, the other person speaks and first listens. Another example of half-duplex is Internet surfing.

Advantage of Half-duplex Mode

  • It also utilizes the entire bandwidth, so that maximum data can be transmitted at a time.

Disadvantage of Half-Duplex Mode

  • As one device sends and another has to wait, so there may be some delay in sending the data at the right time.

3. Full duplex

  • In Full duplex mode the data can flow in both directions simultaneously.
  • We can say, Full-duplex mode has two simplex channels but opposite in directions. 
  • Full duplex mode is the fastest mode as compare to others modes (simplex, half).
  • Telephone network is an example of the full-duplex mode. Two people can listen and talk at the same time. Two-lane road where the traffic is move in both direction at a time is another example of Full-duplex mode.

Advantage Of Full-Duplex Mode

  • Both the stations can send and receive the data at the same time.

Disadvantage Of Full-Duplex Mode

  • Bandwidth is divided into two parts.
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