Synchronous
Serial Transmission:
1.
Data flows in a full duplex mode in the form of blocks or frames.
2.
Synchronization between the sender and receiver is necessary so that the sender know where the new
byte starts (since there is no gap between the data).
3.
Synchronous Transmission is efficient, reliable and is used
for transferring a large amount of data.
4.
It provides real-time communication between connected devices. Chat
Rooms, Video Conferencing, telephonic conversations, as well as face to face
interactions, are some of the examples of Synchronous Transmission.
Serial
Asynchronous Transmission
1.
In Asynchronous Transmission data flows in a half duplex mode, 1 byte or
a character at a time.
2.
the size of a character sent is 8 bits to which a parity bit is added
i.e. a start and a stop bit that gives the total of 10 bits.
3.
It does not require a clock for synchronisation; rather it uses the
parity bits to tell the receiver how to interpret the data.
Key
Differences Between Synchronous and Asynchronous Transmission
1.
In Synchronous Transmission data is transferred in the form of
frames on the other hand in Asynchronous Transmission data is transmitted 1
byte at a time.
2.
Synchronous Transmission requires a clock signal between the
sender and receiver so as to inform the receiver about the new byte. 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.
3.
Data transfer rate of Asynchronous Transmission is slower than
that of Synchronous Transmission.
4.
Asynchronous Transmission is simple and economic whereas,
Synchronous Transmission is complex and expensive.
5.
Synchronous Transmission is efficient and has lower overhead as
compared to the Asynchronous Transmission.
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