Transmission Modes in Computer Networks




It is the process of transmitting information between two devices. They confine the flow of data to a particular direction and are characterized by simultaneous sending various bits from their origin to destination. The synchronization can also occur between the sender and receiver.




Direction of exchange

There are three types of transmission modes which include the simplex, half-duplex or full-duplex. They all depend on the directions in which the transfer will take place.

  • Simplex connection

It is where the flow of data is confined in one direction originating from the transmitter to the end user. The fact that the data can only flow in a single path means that it can only be useful in performing specific operations. It is not appropriate in other circumstances because data cannot flow in both directions such as from mouse to the computer.

  • Half-duplex connection

The information can be transmitted in both directions but at different times which means that it is performed in shifts. It offers a bi-directional communication when it utilizes the entire capacity of the line.

  • Full-duplex

In this connection, data can flow simultaneously in both directions which means that the transmission can be executed at the same time. In situations where a single transmission medium is utilized in either direction, then the bandwidth is divided for the specific direction of flow of data.


Serial and parallel transmission

It is the simultaneous translation of various elementary bits by the communication channel. The parallel connection is where simultaneous transmission is carried out over different channels such as a cable or any physical medium. In most cases, the PC-type computers would require ten wires to establish the parallel connection. The serial connection is where the information is transmitted at a sequence which means one bit at a time. The transmitter transforms the incoming parallel data into serial data, and the communication controller is what makes the operations successful.


Synchronous and asynchronous transmission

These communication modes are useful in synchronizing the sender and receiver by distinguishing their characters. The asynchronous connection allows transmission of the characters at irregular intervals in time. The simultaneous connection is where the information is received continuously by the end user even if there is not a transmission of bits.




It is done at the same speed and guarantees an error-free data during the transfer because of the supplementary information. The bits are sent efficiently during the simultaneous transmission without separation between characters. Therefore, it is necessary for the synchronization elements to be included to allow efficiency of the process.