Computer Network Transmission Mode

Duplex or Transmission Mode:

Transmission Mode or Duplex means transferring of data between two devices. It is also known as Communication Mode.

The Transmission Mode is divided into 3 categories –
• Simplex Mode
• Half-duplex Mode
• Full-duplex Mode

Simplex Mode: –

• It is a Unidirectional Communication; the data transmits in one direction only from one device to another device.
• The sender device that sends data can only but cannot received the data. Other hand the receiver device that receive only the data but cannot send the data.
• Example: – T.V. and Keyboard.

Advantages of Simplex Mode: –

• The main advantages of Simplex mode are that the full capacity of the transmission medium is utilized during the transmission, there are no any traffic issues.

Disadvantages of Simplex Mode:

• There are no possibilities of Bio-directional communication. Here two devices cannot communicate with each other.

Half-duplex Mode:

• It is a Bio-directional transmission but one at a time.
• When the sender in sending the data receiver can only receive, they cannot send at the same time and vice versa.
• Example: – Walkie-talkie.

Advantages of Half-duplex Mode:

• The main advantages of the Half-duplex mode are that they can utilize the entire bandwidth during the transmission.

Disadvantages of Half-duplex Mode:

• In Half-duplex mode, when one device sending the data, then another device receiving the data, then another device waits, they can be some delay at the time.

Full-duplex Mode: –

• It is a Bio-directional communication.
• Both devices sending and receiving data at the same time.
• Example: – Telephone network.

Advantages of Full-duplex mode: –

• No delay in communications both devices can send and receive data at the same time.

Disadvantages of Full-duplex mode: –

• The full capacity is divided by into both directions.

Comparison of Simple, Half-duplex and Full-duplex mode:

Simple	Half-duplex	Full-duplex
It is a Unidirectional communication.	It is a Bi-directional communication but one at a time.	It is Bio-directional communication both at a time.
The sender can only send the data.	The sender can only send and receive data, but one at a time.	The sender can send and receive data both at a time.
It is the worst performing mode in transmission mode.	It is better than Simplex.	It is the best performing mode of transmission mode.
Its example of Keyboard & Monitor.	Its an example of a Walkie-talkie.	Its example of Telephone.

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