Data Communication & Computer Networking



Data Communication & Computer Networking Notes DATA COMMUNICATION:

“Transferring of data from one point to other is called data communication”.

BASIC ELEMENTS OF DATA COMMUNICATION:

Three basic elements are

1) Transmitter or Sender:

Who sends data called a Sender.
2) Medium:

Which carries information called a Medium. Such as cables, air (etc)

3) Receiver:
Which receives the information, called a Receiver.

DATA COMMUNICATION MODES:

There are three modes of data communication

1) Simplex Mode:

Data can send only in one direction/side (from sender to
receiver).
Examples:
Radio, Television (etc)
2) Half-Duplex Mode:

Data can send both directions/sides but only in one direction/side at a time (from sender to receiver or from receiver to sender).

Examples:

Wireless set, Computers in a Network (etc)
3) Full-Duplex Mode:

Data can send both directions/sides at a time (from sender to receiver and from receiver to sender).

Examples: Telephone Lines (etc)

TYPES OF DATA:

There are two types of data are

1) Digital Signals:

  •  Computer use digital signals.
  •  Data in the form of “0” and “1”.
  • Discrete data.
  • Examples: Data stored in memory (etc)

2) Analog Signals:

  • Telephone lines use digital signals.
  • Data in the form waves.
  • Continue data.
  • Examples: Human Voice (etc)

MODEM:

About Saweel Ur Raheem

Check Also

MCSE Notes Lecture # 4 : Applying Security to Folders

LECTURE 4 APPLYING SECURITY ON FOLDERS: Open Folder Options. Go to View Tag and uncheck ...

© Copyrights 2014. All rights are reserved www.latestcontents.com