1) Simplex.
2) Half Duplex.
3) Full Duplex.
SIMPLEX:-
One way transmission of data is called Simplex. In Simplex transmission signals are transmitted in one way direction one station is transmitter and other is Receiver.
HALF DUPLEX:-
In half duplex operation both station may transmit, but only one at a time.
FULL DUPLEX:-
In full duplex operation both station may transmitted simultaneously. The medium is carrying signals at both directions at same time.
Data communication can be described simply in 3 terms.
1) Data Transmitter. (Source)
2) Data Transmission. (Channel)
3) Data Receiver. (Receiver)
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