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Type of Communication Systems

The communication system can be classified into three categories

1. Simplex
2. Full Duplex
3. Half Duplex

Simplex

A simplex system is a communication system in which the message can be send in one direction only.

Radio and TV boardcasting are eg

User – Transmitter – Receiver – User

Full Duplex

A full duplex system is one in which the link is capable of transmitting in both the direction, at the same.

Eg : telephone system.

Half Duplex

In a half duplex system, each end may transmit, but only one at a time. This requires both transmitting and receiving circuitary at each end, but the actual link between the two ends may be shared.

Eg : A citizen’s band radio where a frequency channel is shared and each party has to say “over” to switch the direction of the communication.

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