Data Communications



If it is assumed that the input device (source) and a transmitter of the Personal Computer, Personal Computer which will send the data to other users, where the contents of the data in question is a certain data message. PC users will naturally use electronic mail or e-mail on Personal Computer and send messages using the keyboard.

Keyboard input results in the form of data from the digital signal transmitted to the computer’s memory in a series of bits. The computer will send data through a transmission line to the transmitter. Then the data bits in a digital form is converted to analog form by a modem in this case it acts as a transmitter.

Signal transmission disaluran move will weaken due to the attenuation in each specific part that needs to be strengthened so that the signal reached the receiver. Recipients will try to read the received data may be interpreted whether or not, if it can read the signal will be returned to the form of a digital signal so that the receiving computer can accommodate the incoming data and understandable. If no data is wrong or does not understand the obligation of the sender to resend the data, so that eventually the concept of “error free” user who visits will occur.

Data Communication Schematic. (image:

Data Communication Schematic. (image:

Important elements of the communication model

Source: This tool generates the data to be transmitted / delivered. For example: telephone and personal computer.

Transmitter: the data is usually generated by the source system is not transmitted directly in the form that they produce. Transmitter transform or encode the same information as getting an electromagnetic signal to be transmitted sequentially. For example: a modem receives a digital bit stream from the Personal Computer and change the bit stream to an analog signal that can be received by the telephone network.

Tranmission System: Can be a one-way transmission (radio system) or two-way (telecom networks).

Receiver: receives signals from the transmission system and turn it into a form that can be understood by the destination device. For example a modem will receive analog signals from a network or transmission form and convert it into a digital form that is understandable by computers.

Destination: Recipient of data coming from the receiver.

Fajar Indra Yunanto – 125150300111038


2 thoughts on “Data Communications

  1. What is the transmission system

  2. This article is suitable for students of SI,,,,,,

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