The main difference between synchronous and asynchronous transmission is
The main difference between synchronous and asynchronous transmission is The clocking is derived from the data in synchronous transmission.
Whereas, in Asynchronous Transmission sender and receiver does not require a clock signal as the data sent here has a parity bit attached to it which indicates the start of the new byte. ... Synchronous Transmission is efficient and has lower overhead as compared to the Asynchronous Transmission.
Whereas Asynchronous Transmission does not require a clock but it adds a parity bit to the data before transmission. In Synchronous data transfer, data is transmitted in the form of blocks or frames whereas in asynchronous data transfer, transmission is done in 1 byte or character at a time.
The major difference between them lies in their transmission methods, i.e. Synchronous transmissions are synchronized by an external clock; whereas Asynchronous transmissions are synchronized by special signals along the transmission medium.
Synchronous transmission is a data transfer method which is characterized by a continuous stream of data in the form of signals which are accompanied by regular timing signals which are generated by some external clocking mechanism meant to ensure that both the sender and receiver are synchronized with each other.