Data Communication is the collection and distribution of the
electronic representation of information FROM and TO remote facilities by means
of electrical transmission system.
For example, telephone lines, satellites or coaxial cable.
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| The structures of Coxial Cable |
Data can be on a variety of styles: text, pic, etc
All
this type of info needs to be CONVERTED into signal that can be understood by
the communication media in order to transmit the data.
Types of signal : Analogue signal & Digital signal
Digital signal
Transmission
of binary electrical/light pulses that only have to possible states 0 and 1 =
this is the language of computers (represent of a square wave).
• The
process of changing ANALOGUE to DIGITAL signal = Modulation
• The
process of changing DIGITAL to ANALOGUE signal = Demodulation
• Hardware
that used in computer to do this process----> Modem
Table below shows the binary digit
Next, we proceeded to the data transmission mode.
It can be divided into serial transmission and parallel transmission.
In short, serial transmission transmits all the bits one after another on a single line.
This style is a bit slower compared to parallel transmission. However, in parallel transmission, a group of bits is transmitted simultaneously by using a separate line for each bit.
The figure below show the two types of serial transmission mode.
In asynchronous transmission, a groups of bits can be sent at any time and receiver never knows when they will
arrive.
Flow of data
Little Reflection of the day♥
After the lesson, I understand that the importance and how useful the transmission of data in our daily life. Unfortunately, the transmission of information via the Internet is not completely secure. Any transmission is at your own risk. So it is important for us to do our best to protect our own personal data.
Last but not least, I would like to share an awesome video with you all =) Let's enjoy!! ♥
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