Technology

Difference Between Simplex and Half Duplex Transmission Modes

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Main Difference

The main difference between these two modes of transmission is that the simplex mode supports single way data traveling, the half-duplex mode is able to transmit data two ways but one way at a time.

Simplex vs. Half Duplex

Data transmission modes are basically of three types based on data speed, channel, and delivery. They are also termed as data transmission modes. The simplex transmission mode is the data delivery model in which data is only sent in a single direction. The sender sends the data and does not possess the ability to receive. A common example of simplex transmission includes TV and radio broadcasting service. Half-duplex transmission mode comprises of bidirectional communication but uses a single channel. The data can be sent or received in half-duplex transmission at a time.

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Comparison Chart

SimplexHalf Duplex
The simplex transmission mode is the simplest kind of communication mode that is unidirectional. The data can only be sent towards a single direction.Half Duplex mode of transmission is the kind of communication mode that supports two-way communication but with delay. Data can travel only in one direction at a time.
Real-life Examples
Television and radio broadcastsWalkie-talkie. Text message
Performance
less efficient than half and full duplex.Better performance than simplex but not efficient as full duplex.
End to End Communication
Data is only sent. Can not be received.Data can be sent or received at a time.
Direction of Data
UnidirectionalBidirectional but once at a time.
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What is Simplex Transmission?

The simplex transmission mode is the simplest kind of communication mode that is unidirectional. The data can only be sent towards a single direction. The sender possesses the ability to send the data only, data cannot be received in such sort of transmission mode. Common examples of simplex transmission mode include television and radio broadcasts, Data entry via peripheral devices such as mouse keyboard, etc. all fall in simplex transmission. It is old technology data communication phenomena and is considered less efficient than half and full-duplex.

What is Half Duplex Transmission?

The half Duplex mode of transmission is the kind of communication mode that supports two-way communication but with delay. Data can travel only in one direction at a time. It comprises of a single channel for both sending and receiving the data. Common examples of half-duplex transmission mode include communication via Walkie-talkie. Text message services on the cellular network are kind of half-duplex communication. Half-duplex modes are still in use publicly but are being replaced by full-duplex modes being more efficient and user-friendly.

Key Differences

  1. Simplex transmission mode is unidirectional.
  2. The half-duplex transmission mode is bidirectional but supports single way communication at a time.
  3. The television broadcast is the most common example of the simplex transmission mode.
  4. Data can only be sent by a sender in Simplex transmission mode and cannot be received.
  5. Data can be sent and received in half-duplex transmission mode, but one thing one time.

Conclusion

Simplex mode is the unidirectional mode of transmission, whereas the half-duplex transmission mode is two way but one way at a time.

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Harlon Moss

Harlon currently works as a quality moderator and content writer for Difference Wiki. He graduated from the University of California in 2010 with a degree in Computer Science. Follow him on Twitter @HarlonMoss