Modes of transmission in Networking | CCNA

Modes of transmission in Networking | CCNA

Previously we read About What Is Networking  ? and Advantages of computer networking  and Networks based on Requirement , in this post we Study about Type of   Modes of transmission in Networking 

There are three modes of transmission, 

1.  simplex, 
2. half duplex, and 
3. full duplex

Simplex

1. In simplex transmission mode, the communication between sender and receiver occurs in only one direction.  The sender can only send the data, and the receiver can only receive the data.  The receiver cannot reply to the sender.
2. Simplex transmission can be thought of as a one-way road in which the traffic travels only in one direction—no vehicle coming from the opposite direction is allowed to drive through.
3. To take a keyboard / monitor relationship as an example, the keyboard can only send the input to the monitor, and the monitor can only receive the input and display it on the screen.  The monitor cannot reply, or send any feedback, to the keyboard.

Note : -  Used For Broadcasting 

Half Duplex

1. The communication between sender and receiver occurs in both directions in half duplex transmission, but only one at a time.  The sender and receiver can both send and receive the information, but only one is allowed to send at any given time.  Half duplex is still considered a one-way road, in which a vehicle traveling in the opposite direction of the traffic has to wait till the road is empty before it can pass through.

For example, in walkie-talkies, the speakers at both ends can speak, but they have to speak one by one.  They cannot speak simultaneously.

Full Duplex

1. In full duplex transmission mode, the communication between sender and receiver can occur simultaneously.  The sender and receiver can both transmit and receive at the same time. Full duplex transmission mode is like a two-way road, in which traffic can flow in both directions at the same time.

For example, in a telephone conversation, two people communicate, and both are free to speak and listen at the same time.


Key Differences of the Three Transmission Modes

1. In simplex mode, the signal is sent in one direction. In half duplex mode, the signal is sent in both directions, but one at a time.  In full duplex mode, the signal is sent in both directions at the same time.
2. In simplex mode, only one device can transmit the signal. In half duplex mode, both devices can transmit the signal, but one at a time.  In full duplex mode, both devices can transmit the signal at the same time.
3. Full duplex performs better than half duplex, and half duplex in turn performs better than simplex.
4. Simplex: The keyboard sends the command to the monitor. The monitor cannot reply to the keyboard.
5. Half duplex: Using a walkie-talkie, both speakers can communicate, but they have to take turns.
6. Full duplex: Using a telephone, both speakers can communicate at the same time.
7. The full duplex transmission mode offers the best performance among the three, on account of the fact that it maximises the amount of bandwidth available.

Note :- In next post we will Study about Types of Devices  in Network  .

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