Synchronous and asynchronous are the two terms used in transmission as a counter part of each other. However, there is a vast difference between these terms, which is as under.
Synchronous means something happening in the same time or regular intervals. Normally this term is associated with synchronous transmission. In transmission, synchronous means a rhythm of a transmitting device, which a receiving device can understand with an ultimate data recovery into useful form. Television is a beautiful example of it. In transmission, data is sent with clock pulses and on the receiver’s end, received with clock pulses. In this type of transmission, receiver and transmitter before communicating the data, communicate with each other to get synchronized with each other.
Asynchronous mean without any specific time or pattern or rhythm. This term is again very much common in transmission. In transmission, asynchronous mean without any clock pulse data is sent and received. This can happen anywhere when we just don’t know when, where and what type of data can be sent or received. In asynchronous transmission, before transmission of data, a start bit is sent and at the end of data an end bit is sent. These two bit tell the pattern of the data. Just like what happens when a key is pressed on a keyboard.
Synchronous vs Asynchronous
Asynchronous transmission does not require any synchronization between transmitting and receiving ends unlike it is necessary in the case of synchronous transmission. In synchronous transmission clock pulses are necessary for synchronization, while in asynchronous transmission it is not required. Relatively asynchronous transmission is faster than synchronous transmission. Hardware for synchronous is expensive and very complex with respect to hardware required for of asynchronous transmission. In asynchronous transmission it is necessary to send information of data with the data, which increases the size of packet. While in synchronous transmission, we directly send the data with the help of clock pulses.
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