In digital electronics, both Synchronous and Asynchronous Transmission are the type of serial data transmission in which data is transmitted between sender and receiver based on the clock pulse used for synchronization.
Following are the important differences between Synchronous and Asynchronous Transmission −
|Sr. No.||Key||Synchronous Transmission||Asynchronous Transmission|
|1||Definition||Synchronous transmission is the type of transmission in which a common clock pulse is shared between transmitter and receiver in order to permit synchronized communication.||On other hand Asynchronous transmission is the type of transmission in which the sender and receiver have their own internal clocks thus do not need an external common clock pulse.|
|2||Data Unit||In Synchronous transmission data is sent in the form of frames or blocks so the data unit is Frame/block.||On other hand in Asynchronous transmission data is transmitted in the form of byte or character so the data unit is byte/character.|
|3||Performance and Cost efficient||Due to implementation of common clock pulse in Synchronous transmission, the transmission of data is faster as compared to that in Asynchronous transmission but this makes this transmission costlier.||On other hand each sender and receiver has their own input clocks in Asynchronous hence the transmission depends on its synchronization so is slower as compared to that in Synchronous transmission but this makes this transmission cheaper.|
|4||Complexity||It is easy to design Synchronous transmission.||However on other hand the Asynchronous transmission is complex in nature and design.|
|5||Data Gap||Due to the common clock pulse in Synchronous transmission there is no gap present between data.||On other hand the Asynchronous transmission there is gap present between the data and consists of start bit and end bit in middle of which actual data is present.|