asynchronous communication - meaning and definition. What is asynchronous communication
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What (who) is asynchronous communication - definition


Asynchronous communication         
TRANSMISSION OF DATA WITHOUT THE USE OF AN EXTERNAL CLOCK SIGNAL

In telecommunications, asynchronous communication is transmission of data, generally without the use of an external clock signal, where data can be transmitted intermittently rather than in a steady stream. Any timing required to recover data from the communication symbols is encoded within the symbols.

The most significant aspect of asynchronous communications is that data is not transmitted at regular intervals, thus making possible variable bit rate, and that the transmitter and receiver clock generators do not have to be exactly synchronized all the time. In asynchronous transmission, data is sent one byte at a time and each byte is preceded by start and stop bits.

Asynchronous communication mechanism         
The role of an asynchronous communication mechanism (ACM) is to synchronize the transfer of data in a system between a writing process and a reading process operating concurrently.
Asynchronous serial communication         
  • order of data bits]], the presence or absence of a parity bit, the form of parity (even or odd) and the transmission speed must be pre-agreed by the communicating parties. The "stop bit" is actually a "stop period"; the stop period of the transmitter may be arbitrarily long. It cannot be shorter than a specified amount, usually 1 to 2 bit times. The receiver requires a shorter stop period than the transmitter. At the end of each character, the receiver stops briefly to wait for the next start bit. It is this difference which keeps the transmitter and receiver synchronized.
FORM OF SERIAL COMMUNICATION LACKING SYNCHRONIZATION CONTROL SIGNALS
Asynchronous communications system; Start-stop transmission; Stop bit; Asynchronous serial; Start bit; Asynchronous start-stop; Start-stop signalling; Asynchronous serial protocol
Asynchronous serial communication is a form of serial communication in which the communicating endpoints' interfaces are not continuously synchronized by a common clock signal. Instead of a common synchronization signal, the data stream contains synchronization information in form of start and stop signals, before and after each unit of transmission, respectively.