• सुखार्थी त्यजते विद्यं विध्यार्थी त्यजते सुखम्सु sखर्थीन: कुतॊ विद्या कुतॊ विध्यार्थीन: सुखम् ||
  • “Luxury people leave knowledge, but a student leaves Luxury No knowledge for one who seeks Luxury, No luxury for student”
  • न चोर हार्यं न च राज हार्यं न भात्रू भाज्यं न च भारकारि |व्ययं कृते वर्धत एव नित्यं विद्याधनं सर्वधनप्रधानम ||
  • Cannot be snatched away by thief, cannot be snatched away by king, Cannot be divided among brothers, Not heavy either If spent daily, it always keeps growing. The wealth of knowledge is the precious of wealth of all”

Transmission Modes

Transmission Modes

Communication between two devices can be in simplex, half-duplex, or full-duplex mode.

Simplex Mode

Communication is unidirectional,

Only one of the two devices on a link can transmit data; the other can only receive data.

There is no mechanism in for information to be transmitted back from receiver to sender.

The entire capacity of the channel is used to send data in one direction.


Half Duplex Mode

Each station can both transmit and receive, but not at the same time.

When one device is sending, the other can only receive, and vice versa.


Entire capacity of a channel is used by any of the two devices transmitting at the time


Walkie-talkie is half-duplex systems.

Full Duplex Mode

In full duplex mode each station can both transmit and receive simultaneously.

The full-duplex mode is used when communication in both directions is required at all the time.


The capacity of the channel, however, must be divided between the two directions.



Two computers sharing data simultaneously.

Related questions:

Question:     Make a comparison between simplex and half duplex mode of communication.     [5 marks]


Question:     Make a comparison between half duplex and full mode of communication.     [5 marks]