Data Communication - Data Transmission Mode - Bandwidth [Computer Science - Grade X - New Syllabus]

 

Communication
Communication is sending and receiving information between two or more persons.

 

Telecommunication [MFT 2075]
Telecommunication is a system of transmission of sounds, images, texts or data in the form of electronic signals.

 

Data Communication [SLC 2067]

Data communication is a process of transferring data electronically from one place to other using different transmission mediums. Eg. E-Mail, Chat and phone calls.

 

Components of Data Communication.
i) Data  ii) Sender          iii) Medium       iv) Receiver      v) Protocol

 

Medium
A path through which the sender makes communication to the receiver is known as medium.

 

Protocol [MFT 2075]
Protocol is a set of rules by which computers on the network communicate with each other.

E.g. TCP/IP, SMTP, HTTP etc.

 

Data Transmission Mode [MF 2076]

Data transmission mode is the way of transmission of data from one location to another. There are three types of transmission mode:
i) Simplex mode      

ii) Half duplex mode

iii) Full Duplex Mode

 

Simplex mode [MF 2076]
The transmission mode in which transmission of data can take place in one direction only is called simplex mode.
E.g.: Newspaper, Radio and Television.

 

Half duplex mode [MF 2076]
The transmission mode in which transmission of data can take place in both directions but only in one direction at a time is called half duplex mode.

E.g.: Wireless handset and walkie-talkie.

 

Full duplex mode [MF 2076]
The transmission mode in which data can be transmitted in both directions simultaneously is called full duplex mode.

E.g.: Telephone, internet etc.

 

Bandwidth [SEE 2066 S]
Bandwidth can be defined as the maximum volume of data that can be transmitted through a communication system.

We can measure bandwidth in digital devices by bits per second and in analogue devices by cycles per second or Hertz (Hz).