UNIT – II
CHAPTER – I
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Asynchronous and Synchronous Transmission: A Comparative Study, Essays (university) of Computer Networks
Asynchronous Transmission Synchronous Transmission
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2016/2017
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UNIT – II
CHAPTER – I
Types of Serial Transmission
- (^) Asynchronous Transmission
- (^) Synchronous Transmission
Asynchronous Transmission
Asynchronous Transmission
- (^) Addition of start and stop increase the number of data bits. Hence
more bandwidth is consumed in asynchronous transmission.
- (^) There is idle time between the transmissions of different data
bytes. This idle time is also known as Gap
- (^) The gap or idle time can be of varying intervals. This mechanism
is called Asynchronous, because at byte level sender and receiver
need not to be synchronized. But within each byte, receiver must
be synchronized with the incoming bit stream.
Application of Asynchronous Transmission
Advantages of Asynchronous transmission
- This method of data transmission is cheaper in cost as compared to synchronous e.g. If lines are short, asynchronous transmission is better, because line cost would be low and idle time will not be expensive.
- In this approach each individual character is complete in itself, therefore if character is corrupted during transmission, its successor and predecessor character will not be affected.
- It is possible to transmit signals from sources having different bit rates.
- The transmission can start as soon as data byte to be transmitted becomes available.
- Moreover, this mode of data transmission in easy to implement.
Synchronous Transmission
- (^) Synchronous transmission does not use start and stop bits.
- (^) In this method bit stream is combined into longer frames that may contain multiple bytes.
- (^) There is no gap between the various bytes in the data stream.
- In the absence of start & stop bits, bit synchronization is established between sender & receiver by 'timing' the transmission of each bit.
- (^) Since the various bytes are placed on the link without any gap, it is the responsibility of receiver to separate the bit stream into bytes so as to reconstruct the original information.
- (^) In order to receive the data error free, the receiver and sender operates at the same clock frequency. Application of Synchronous transmission Synchronous transmission is used for high speed communication between computers.