Data Communications

Data communication means data transfer or exchange between the sender and receiver. By means of communication channels such as electronic devices Or a computer as an intermediary for transmitting information For the sender and receiver to understand each other
           Data transmission method Will convert data into signals Or code first and then sent to the recipient And when reaching the destination or receiver, it must be converted Back to be in a human form Able to understand During the transmission, there may be a hurdle that is caused by noise from the outside, causing some data to be damaged. Or distorting the distance in which it is involved Because if the distance of the transmission is greater, it may cause a lot of disturbances as well Must find ways to reduce
these distractions by developing communication mediums that will cause the least disturbance
Basic elements of the system
Basic elements of telecommunication systems Can be classified into the following components:
             1. Messengers Or the source of information (source) may be various signals such as signal, image,
data and sound etc. In the olden days, the use of light, smoke, or gestures could be considered a source of information. Fall into this category as well
             2. Subscribers. Or the destination of the news (sink), which will be recognized by what the messenger Or source of news as long as passed
That communication has achieved its objectives The message recipient or destination of the message will receive that message. Destination not received
News shows that communication is not successful. In other words, no communication occurred.
              3. Channel   (here) may mean an intermediary or intermediary that news travels through May be weather Various signal lines, or even liquid, such as water, oil, etc. are like bridges to allow messages to cross from one side to the other.
              4. Encoding   is to help the messenger and the receiver understand the same. In the interpretation It is therefore necessary to transform
this meaning. Encoding means converting information into energy. That is ready to be sent in the medium The sender has to understand between Sender and receiver Or have the same code Communication can happen.
              5. Decoding.(decoding) means that the message receiver transforms energy from the medium back into the form of news sent by the messenger With the same code or code.
              6. Noise (noise) is something that exists in nature. Often reducing or disturbing the system May occur both in the messenger. Subscribers And channel But in basic education, it is often assumed that the newsletter and the recipients do not have any errors. Location for analysis Usually it is an intermediary or channel. When is the interference between the sender and the receiver? In practice, filter circuits  are used to filter signals from the source. In order to improve the quality of communication, and then take action such as encoding data sources etc.

Network communication
            means   the transfer of data or information from one location to another. By relying on the data transmission system Via electrical waves or light The devices that comprise the data communication system are generally called
Data Communication Networks
Basic components

  1. Sending Unit
  2. Data transmission channel (Transmisstion Channel)
  3. Receiving Unit
The main objectives of applying communication media in the organization are

  1. To receive data and information from the data source
  2. To send and distribute information quickly
  3. To reduce working time
  4. In order to save the cost of sending news
  5. To help expand the organization’s operations
  6. To help improve the administration of the organization
Benefits of data communication

1) Easy data storage and fast communication Storage, which is in the form of electronic signals Can be stored on a high density recording pad
A memo pad can record more than 1 million characters for that data communication. If the data can be dialed at the rate of 120 characters
per second, then the data can be sent 200 pages in 40 minutes without having to waste time re-entering those data.
2) Accuracy of data Usually, the method of transmitting data using electronic signals From point to point digitally The method of sending that information is checked.
Data condition If the information is incorrect, it will be recognized. And try to find a solution to ensure that the information received is accurate Which may require resending Or in the event of a mistake
Not many recipients may use their programs to correct the information.
3) Speed ​​of work Normally, electrical signals travel at the speed of light. Causing the computer to send data from one hemisphere to another
or search from a large database Can be done quickly The speed of the system makes the user more comfortable, like every airline company.
Can know the information of every flight quickly Make the seat reservations of the airline can be done immediately
4) cost savings Connecting computers together into a network To send or copy data Makes the cost of data usage more economical Compared to
Alternative delivery Can send information to each other via telephone lines


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