In this note, we will discuss about What is Simplex System and Duplex System. The Duplex system is also classified into two categories Half Duplex System and full-duplex system. Welcome to the Poly Notes Hub, a one-stop solution for Diploma Engineering Notes.
Author Name: Arun Paul.
What is Simplex System?
In these systems, the information is communicated in only one direction. For example, the radio or TV broadcasting system can only transmit. They can’t receive. Another example of Simplex communications is the information transmitted by the telemetry system of a satellite to Earth. The telemetry system transmits information about the physical status of the satellite such as its position of temperature. The simplex system has been demonstrated in the figure.
What is Duplex System?
In this type of communication system the information is directed in both directions that is transmission and receiving can be done by this communication system. It is a bidirectional system. This system is classified into two categories, like-
- Half Duplex System
- Full Duplex System
What is Half Duplex System?
These systems are bidirectional, i.e. they can transmit as well as receive but not simultaneously. At a time, these systems can either transmit or receive, for example, a transceiver or walky-talky set. The direction of communication alternates. Radio communications such as those used in the military, fire fighting, citizen band (CB), and amateur radio are half-duplex systems.
What is Full Duplex System?
These are truly bidirectional systems as they allow the communication to take place in both directions simultaneously. This system can transmit as well as receive simultaneously, for example, the telephone systems. However, the bulk of electronic communications is two-way. The best example of a full duplex communication system is the telephone system.
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Differences Between Simplex System and Duplex System
| Parameter | Simplex | Duplex |
|---|---|---|
| Definition | Communication in one way. | Communication in two way. |
| Examples | Radio and TV Broadcasting | Telephone |
Differences Between Half Duplex and Full Duplex System
| Parameter | Half Duplex | Full Duplex |
|---|---|---|
| Definition | Communication in two way but one at a time. | Communication in two way. |
| Examples | Walky Talky | Telephone |
