Advantages And Disadvantages Of Serial And Parallel Data Transmission

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What is data transmission? Refers to the process of transferring data between two or more digital devices. Data is transmitted from one device to another in analog or digital format. Basically, data transmission enables devices or components within devices to speak to each other. How does data transmission work between digital devices? Data is transferred in the form of bits between two or more digital devices.

There are two methods used to transmit data between digital devices: serial transmission and parallel transmission. Serial data transmission sends data bits one after another over a single channel. Parallel data transmission sends multiple data bits at the same time over multiple channels.

What is serial transmission? When data is sent or received using, the data bits are organized in a specific order, since they can only be sent one after another. The order of the data bits is important as it dictates how the transmission is organized when it is received.

It is viewed as a reliable data transmission method because a data bit is only sent if the previous data bit has already been received. Example of Serial Data Transmission Serial transmission has two classifications: asynchronous and synchronous. Asynchronous Serial Transmission Data bits can be sent at any point in time. Stop bits and start bits are used between data bytes to synchronize the transmitter and receiver and to ensure that the data is transmitted correctly. The time between sending and receiving data bits is not constant, so gaps are used to provide time between transmissions. The advantage of using the asynchronous method is that no synchronization is required between the transmitter and receiver devices. It is also a more cost effective method.

A disadvantage is that data transmission can be slower, but this is not always the case. Synchronous Serial Transmission Data bits are transmitted as a continuous stream in time with a master clock. The data transmitter and receiver both operate using a synchronized clock frequency; therefore, start bits, stop bits, and gaps are not used. This means that data moves faster and timing errors are less frequent because the transmitter and receiver time is synced.

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However, data accuracy is highly dependent on timing being synced correctly between devices. In comparison with asynchronous serial transmission, this method is usually more expensive. When is serial transmission used to send data? Serial transmission is normally used for long-distance data transfer. It is also used in cases where the amount of data being sent is relatively small.

It ensures that data integrity is maintained as it transmits the data bits in a specific order, one after another. In this way, data bits are received in-sync with one another. What is parallel transmission?

When data is sent using, multiple data bits are transmitted over multiple channels at the same time. This means that data can be sent much faster than using serial transmission methods. Example of Parallel Data Transmission Given that multiple bits are sent over multiple channels at the same time, the order in which a bit string is received can depend on various conditions, such as proximity to the data source, user location, and bandwidth availability. Two examples of parallel interfaces can be seen below. In the first parallel interface, the data is sent and received in the correct order.

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In the second parallel interface, the data is sent in the correct order, but some bits were received faster than others. Example of Parallel Transmission – Data Received Incorrectly Advantages and Disadvantages of Using Parallel Data Transmission The main advantages of parallel transmission over serial transmission are: • it is easier to program; • and data is sent faster. Although parallel transmission can transfer data faster, it requires more transmission channels than serial transmission. This means that data bits can be out of sync, depending on transfer distance and how fast each bit loads. A simple of example of where this can be seen is with a voice over IP (VOIP) call when distortion or interference is noticeable. It can also be seen when there is skipping or interference on a video stream. When is parallel transmission used to send data?