Data Flow : Simplex & Half Duplex& Full Duplex &

 Data Flow :

 

Simplex, Half Duplex, Full Duplex

What are the types of data flow?

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

What is simplex communication?

1__Simplex: 

In simplex mode :

• the communication is unidirectional, as on a one-way street.
• Only one of the two devices on a link can transmit; the other can only receive .
• The simplex mode can use the entire capacity of the channel to send data in one direction.

What is Half-Duplex communication?

2__Half-Duplex : 
In 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.

NOTE

• In a half-duplex transmission ,the entire capacity of a channel is taken over by whichever of the two devices is transmitting at the time.
• The half-duplex mode is used in cases where there is no need for communication in both directions at the same time; the entire capacity of the channel can be utilized for each direction.

What is Full-Duplex communication?

3__Full-Duplex :
In full-duplex mode (also called duplex), both stations can transmit and receive simultaneously.
NOTE

• The full-duplex mode is like a two-way street with traffic flowing in both directions at the same time.
•  In full-duplex mode, signals going in one direction share the capacity of the link with signals going in the other direction.
• This sharing can occur in two ways:
• Either the link must contain two physically separate transmission paths :

one for sending and the other for receiving.
or the capacity of the channel is divided between signals traveling in both directions.

• One common example of full-duplex communication is
•  the telephone network.
• When two people are communicating by a telephone line, both can talk and listen at the  same time.
• The full-duplex mode is used when communication in both directions is required all the time.
• The capacity of the channel, however, must be divided between the two direction
• 
  

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