MODES OF TRANSMISSION

Ø The way in which data is transmitted from one device to another device is known as transmission mode .

Ø The transmission mode is also known as the communication mode .

Ø Each communication channel has a directional associated with it and transmission media provide the direction .

Ø The transmission mode id defined in the physical layer .

TRANSMISSION MODE

1.   SIMPLEX MODE

2.   HALF DUPLUEX MODE

3.   FULL DUPLEX MODE

Simplex mode :

a)     In simplex mode , the communication in unidirectional.

b)   A device can only send the data but cannot receive it or  it can receive the data but cannot send the data .

c)   The radio station is a simplex channel as it transmit the signal  to the listener but never allows them to transmit back

Half duplex mode :

 

a)   In half duplex channel direction can be reversed .

b)   Message flow in both the directions , but not at the same time .

c)   In half duplex mode , it is possible to perform the error detection and if any error occurs , then the receivers request the sender to transmit the data .

d)   A walkie taklie is an example of half duplex mode one party speaks and another party listens .

 

FULL DUPLEX MODE

a)   In full duplex mode , the communication is bidirectional

b)   Both the stations can send and receive the message simultaneously.

c)   Full duplex mode has two simplex channels .One channel has traffic moving in one direction , and another channel has  traffic flowing in the opposite direction .

d)   The full duplex mode is the fastest mode of communication between devices .