What is Data Transmission? Data transmission is a process in which digital and analog data is transmitted between two or more devices. This data is transmitted in two ways from serial and parallel data transmission. This is in the form of data bits. Data transmission is also called digital transmission. They are used for transferring data for a long distance.
There are two types of data transmission first serial data transmission and second parallel data transmission. In today’s post, we will tell you what the difference between these two data transmission is and how data transfer is done through them. Let us know about the difference between serial and parallel data communication.
What is the Difference Between Serial and Parallel Data Communication:
Well, there are so many differences in serial and parallel data communication, but let’s know about some important differences. Prior to this, it must be read, what is the data.
- A single line is required in serial transmission, data transfer and communication need multiple lines in the same parallel transmission.
- Serial transmission is used for long-distance communication, whereas parallel transmission is used for shorter distance communication.
- Error and noise are the lowest in serial transmission if we compare it to parallel transmission. Since one bit follows, the other can be sent simultaneously in serial transmission, multiple bits can be sent simultaneously in parallel transmission.
- Parallel transmission is very fast because the data is transmitted in multiple lines, the data is transferred in a serial transmission from a single wire.
- Serial Transmission is full duplex because the sender can receive data along with sending as well as the parallel transmission is a half-duplex because the data can be either sent or received.
- Serial transmission cables are very thinner, longer and economical compared to Parallel Transmission cables.
- Serial transmissions are more reliable and straightforward, however, Parallel Transmission is more unreliable and complicated.
What is Parallel Data Communication:
In such data transmission, all the bits are transmitted simultaneously with different communication lines at one time. In this, binary data is organized as a bits group. Just as we organize the letters, we speak them as words, binary data is organized and forwarded in the form of bits.
The number of bits in which it is sent is used. If 8 bits are to be sent then 8 wires will be used. Its speed is faster than serial data communication. But its disadvantage is that it is more expensive. It is used for communicating fewer distances. Transmission inside the computer is a parallel transmission like communication between computers and printers.
Advantage of Parallel Data Communication:
- Its speed is higher than serial data communication.
- It is easy to program.
The Disadvantage of Parallel Data Communications:
It is more effective because the same amount of data that needs to be transmitted requires a communication line.
What is Serial Data Communication:
It follows a bit the second bit. Data is transferred one after the other. In this, only one line is used to transfer data. Data is transferred one after the other, so this parallel data slows down but it is cheap with data communication. This method is used in the telephone. It is used for transmission of long distances.
Advantages of Serial Transmission:
In this, using the single communication line reduces the transmission line cost, if we compare it with the parallel transmission.
Disadvantages of Serial Transmission:
- Using conversion devices in source and destination end, there is a considerable increase in the total transmission cost.
- This method is much slower than the comparison of parallel transmission since the bits are transmitted to serially one after another.
Types of Serial Data Communications:
Synchronous and Asynchronous Communication:
- Asynchronous Data Communication
It only sends a single character at a time whether it is a number or an alphabet. In this, a start bit and stop bit are used for data transfers. The start bit tells the receiver that the new data is about to arrive. The start bit has a value of 0 which shows that the character is about to transfer and alert the receiver to be prepared to get this data.
If the start bit is of value 1, then it indicates that the communication line is Idle and it is called Mark State. While the stop bit indicates that the data has expired, that is, it gives the receiver the information that the data byte is finished and its value is 1. Its value is also low, but its speed decreases.
- Synchronous Data Communication
It does not use start and stop bits, but data is sent as a block. Every single block has a lot of characters. The clock is also used in that which controls the timing of the bits. Its speed is high because it can send a lot of characters together. But its value is high.
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