Communication Service Methods
Communication Service Methods:
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There
are several methods in which data can be transmitted between sender and
receivers
·
Serial
communication
·
Parallel
communication
A) Serial communication:
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In telecommunication and data transmission, serial
communication is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus.
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In serial communication, data is in the form of binary pulses. In
other words, we can say Binary One represents logic HIGH
or 5 Volts, and zero represents a logic LOW or 0 Volts.
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Serial communication can take many forms depending on the type of
transmission mode and data transfer.
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Generally, Serial Transmission is used for long
distance I.e. computer to computer
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Serial Transmission is full-duplex as the
sender can send as well as receive the data.
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Serial Transmission is simple and reliable.
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Error and noise are least in serial as compared
to parallel transmission. Since one bit follows another in Serial Transmission
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In Serial Transmission, data is sent bit by bit
from
one computer to another in bi-direction where each bit has its
clock pulse rate.
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Eight bits are transferred at a time having a start and stop bit
(usually known as a Parity bit), i.e. 0 and 1 respectively.
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Serial Transmission has two subclasses synchronous and
asynchronous. In asynchronous transmission, an extra
bit is added to each byte so that the receiver is alert about the arrival of new data.
Usually, 0 is a start bit, and 1 is the stop bit. In synchronous
transmission, no extra bit is added rather the data transferred in the form of
frames which contains multiple bytes.
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The serial transmission system would not be able to work without
installing hardware at the sending and receiving.
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