Data flow
Flow of data between two devices may be
simplex, half-duplex, or full-duplex. These modes of data transfer (data flow)
tells us about the direction of flow of data, about one-way or two way
transmission of data. "Do both sending and receiving stations are
optimized for data transmission?" -the answer is...
Simplex
In simplex mode of data transfer one-way communication takes
place. Communication is unidirectional i.e. only one device is treated as
sender and other device is treated as receiver.
e.g. a monitor acts only as a receiver to show an output.
e.g. a monitor acts only as a receiver to show an output.
Half-duplex
In half-duplex mode of data transfer two-way communication
takes place. Communication is bidirectional but single station at one time may
either play role of a sender or of a receiver. A single station can't be both a
sender and a receiver at one time.
e.g. communication over walkie-talkies.
e.g. communication over walkie-talkies.
Full-duplex
In full-duplex mode of data transfer two-way communication
takes place between both stations at the same time. A unique station together
sends as well as receives data.
e.g. Talking to your friends over mobile phones.
e.g. Talking to your friends over mobile phones.
