Data communication&Components of communication system?

-

 Data Communication

  • Data communication refers to exchange of messages between sending and receiving devices through some communication medium.
  • These messages are actually the information which can be presented in many forms like text,numbers,images,audio and video.

Components of communication system

  • A communication system is used to transfer data from one point to other.
  • The main components of communication system are discussed below;

  1. Sender 
  2. Receiver
  3. Message
  4. Protocol
  5. Transmission medium
Sender
  • Sender is a device that initiates the communication process.
  • It sends messages consisting of text,numbers,pictures,etc.
  • It is also called source or transmitter.
  • Normally,computer is used as a sender in a communication system.
Receiver
  • Receiver is a device that receives a message.
  • It is also called sink.
  • The receiver can be a computer,printer or another device.The receiver must be capable of accepting a message.
Message
  • Message is the data or information to be communicated.
  • It may consist of text,numbers,pictures,sound,video or any combination of these.
  • In a Data communication system,a message is sent in a form of packets.
  • Each message has two parts;
  1. Payload Payload is the actual content of a message.  

  2. Control information Control information contains information about the sender and receiver.Control information is also called the header of a message.
  3. Example It is just like a writting a letter where we write a letter along with the information about its sender and receiver.In this example your letter is the Payload.
Protocol
  • A protocol is a formal agreement between two parties.
  • A network protocol is a formal agreement between two computers to send and receive information.
  • A network protocol defines a set of rules and procedures for communication between a sender and receiver.
Transmission Medium
  • Medium is a physical path that connects a sender and receiver.
  • It is used to transmit data.
  • The medium can be a copper wire,a fiber optics cable,microwaves etc.
  • It is also called a communication channel.
  • A device may use multiple channels at the same time
Example
"If a cell phone is connected with the internet,it uses a data channel(3G,4G,LTE) for using the internet services,and a voice channel for calling purpose".


THE END

Location: Pakistan

Comments

Post a Comment