Asynchronous Transmission


Asynchronous transmission is a method of data communication that allows for the non-simultaneous transmission of data between sender and receiver. In this method, data is transmitted character by character, separated by start and stop bits, with variable time intervals between each character. It is often used in personal computers and home networks as it allows data to be transmitted at a more flexible rate rather than in a steady stream.


The phonetics of the keyword “Asynchronous Transmission” is: əˌsɪŋkrəˈnəs trænsˈmɪʃən

Key Takeaways

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  1. Asynchronous Transmission is a data communication method where information is sent in a stream of individually interpreted bits.
  2. This form of data communication adds start and stop bits at the beginning and end of each data byte, which allows the receiver to identify the start and stop of each byte in the stream of data.
  3. Asynchronous transmission is commonly used for transmitting text and used in devices like keyboards and modems.



Asynchronous Transmission is a key term in the realm of telecommunications and data transfer and plays a crucial role in the efficient functioning of modern technology. Its importance lies in its design, whereby data can be transmitted intermittently, rather than in a steady stream. This means that data packets, each of which is preceded by a start bit and followed by a stop bit, can be sent at irregular intervals, thus reducing synchronization issues and enabling a more efficient use of available bandwidth. The presence of start and stop bits also ensures error detection and correction in the data transmission. Asynchronous Transmission is integral to various technologies, including computer networks, email systems, and Internet communication, marking it as a significant concept in the field of Information Technology.


Asynchronous transmission is primarily used for the purpose of avoiding synchronization disparities. It plays a critical role in the transmission of data when there is no regular or specific timeframe for sending information. For example, in many instances, it might not be efficient or feasible to wait for the entire data set to be ready before it can be sent, like in the case of online chatting or email services. To accommodate the sporadic or irregular sending of data, asynchronous transmission technology comes into the picture offering an efficient solution.Moreover, this method is broadly utilized in areas where data is sent sporadically as opposed to in a steady stream. Keyboards and computer mice are primary examples of such devices since the data from these devices is only sent when there is an action such as a click or a key press. In these cases, asynchronous transmission is beneficial as it doesn’t require constant communication or frequent synchronization between the sending and receiving devices, saving resources and allowing for more efficient data transmission.


1. Email Communication: Email is a perfect example of asynchronous transmission in practice. When you send an email, it gets stored in the server and can be retrieved by the recipient at any time they like-even if their device is power off at the time of sending the email. Both the sender and the receiver do not need to be active or online at the same time.2. Web Browsing: When you visit a web page, your computer sends a request to the server, which then responds by sending the data back to your computer. This process does not require simultaneous interaction, making web browsing an example of asynchronous transmission.3. Online Forums and Social Media Platforms: When users post messages or comments in online discussion forums or platforms like Reddit or Facebook, other users do not need to be online at the same time to see or respond to these. The messages get stored and can be read and responded to at a later time.

Frequently Asked Questions(FAQ)

Q: What is Asynchronous Transmission?A: Asynchronous Transmission is a data communication method where information is sent over a network at irregular intervals, rather than in a steady stream. This means that data can be transmitted individually with a start bit and a stop bit.Q: How does Asynchronous Transmission work?A: In Asynchronous Transmission, each byte of data is transferred independently. Each byte is surrounded by start and stop bits, which signal the beginning and end of the byte. No additional synchronization is needed.Q: What is the importance or use of Asynchronous Transmission?A: The Asynchronous Transmission method allows for data to be sent as it becomes available, rather than waiting for a block or fixed amount of data to be ready. This makes it a more efficient method for situations where data is generated sporadically, rather than in a consistent stream.Q: Can you give an example of Asynchronous Transmission in daily life?A: An everyday example of Asynchronous Transmission is in email communication – the sender can send an email (data) whenever they want, and the recipient can also receive and read the email at their convenience.Q: What is the difference between Asynchronous and Synchronous Transmission?A: The main difference lies in the timing of data transmission. With Asynchronous Transmission, data is sent as it becomes available, making it ideal for transmission that doesn’t occur in a fixed or steady stream. Synchronous Transmission, on the other hand, transmits data in a steady stream, often in large blocks. Q: What are the advantages of Asynchronous Transmission?A: Some advantages of Asynchronous Transmission include its simplicity, lower cost, and the ability to handle data that is generated at irregular intervals. It requires less bandwidth and is highly efficient.Q: What are the potential disadvantages of Asynchronous Transmission?A: One possible disadvantage of Asynchronous Transmission is the higher chance of error since each byte of data is sent separately rather than in a block. Additionally, each byte requires start and stop bits, which can result in higher overhead.

Related Technology Terms

  • Start Bit
  • Stop Bit
  • Parity Check
  • Bit Rate
  • Serial Communication

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