Communication Systems


   
 
Modems with reference to computers
What is a Modem?
 
A modem (a modulator/demodulator) lets you connect your computer to a standard telephone line so that you can transmit and receive electronically transmitted data. It is the key that unlocks the world of the Internet and its World Wide Web, commercial online services, electronic mail (E- mail), and bulletin board systems (BBSes).
 
  
     
   
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Communication Systems

  		•  Analog and Digital Communication
  		• Communication Systems with Input and Output Transducers
  		• Elements of a Communication System
  		• Advantages of Digital Communication Systems over Analog Communication Systems
  		• Undesirable Effects in the Course of Signal Transmission
  		• Modulation
  		• Need for Modulation
  		• Different Types of Modulation
  		• Amplitude Modulation
  		• Modulation Factor
  		• Disadvantages of Amplitude Modulation
  		• Frequency Modulation
  		• Need for Frequency Modulation
  		• Pulse Modulation
  		• Demodulation
  		• Data Transmission and Reception
  		• Principle of Fax Machine
  		• Modems
  		• Symmetric and Asymetric Modem Configuration
  		• Modems with reference to computers
  		• Types of Modems
  		• How Modems Work?
  		• What is the Difference Between Digital and Analog Signals?
  		• Space Communication
  		• Importance of Radio Waves in Modern Communication
  		• Important Terms Used in the Study of Sky Wave Propagation
  		• Space Waves
  		• Basic Principles of Wireless Radio Communication
  		• Microwaves and Radar
  		• Satellites
  		• Satellites Communication
  		• Remote Sensing
  		• Line Communication - 2 - Wire Lines, Cables
  		• Telephone Links
  		• Telephone Circuits
  		• Telephone Lines
  		• Optical Communication - Optical Fibres
  		• Lasers-An Introduction
  		• How a Laser Works
  		• Characteristics of Laser Light
  		• Applications of Lasers
  		• Ruby Laser
  		• Helium - Neon Gas Laser
  		• Principles of Light Modulation
    Animations
  		• Radio Broadcasting - Modulation and Demodulation
  		• Fax
  		• Electromagnetic Spectrum
  		• Electromagnetic Spectrum - An Activity
  		• Active and Passive Satellites
  		• Antenna
  		• Satellite Communication
  		• Remote Sensing Satellites
  		• Optical Fibres
  		• Ruby Laser