Presentation On Computer Network

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Presentation On Computer Network Topic-Transmiss
ion Media Subtopic-Guided Media
Unguided Media Submitted to-
Submitted by- Mr.Navdeep Bhandari
Daljeet Singh
Balwinder Kumar

Baljinder Singh
Amrinder Singh
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Transmission Media Introduction
Guided Media Twisted Pair Coaxial
Cable Optical Fiber Unguided Media
Radiowaves Transmission Microwave
Transmission Infrared Transmission
Laser Transmission Satellite Transmission
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Guided Media Guided
Media is that contain some conducting material to
carry data or signal. Many types of cable and
wires fall under this category. Each of them has
its own characteristics like transmission speed,
effects of noise. Guided media is also known as
wired media. In this we will use wires to send
our data from one place to other place. It
include - Twisted pair Coaxial Cable Optical
fiber
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Unguided Media It
does not contain the signal in some physical
conductor or metal. Rather, it transport
electromagnetic signal through air. It is also
known as wireless media. Because in this we are
not using any king of cable. It includes - Radio
waves Micro waves Infrared waves
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• Radio waves Transmission
• The Radio waves have frequencies between 3khz
  and1Ghz
• Radio waves are Omni direction
• Radio waves can penetrate buildings easily, so
  that are widely use for communication both
  indoors outdoors.
• They also absorbed by rains
• At high frequency, radio wave tends to travel in
  straight line and bounces off the obstacles.

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• Micro waves Transmission
• Micro waves electromagnetic waves having
  frequency between 1 GHZ and 300 GHZ.
• There are two types of micro waves data
  communication system terrestrial and satellite
• Micro waves are widely used for one to one
  communication between sender and receiver,
  cellular phone, satellite networks and in
  wireless LANs.

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• Infrared Waves
• Electromagnetic waves having frequencies from 300
  GHz to 400 THz are called IR waves or Infrared
  waves.
• IR waves are used for short range communication
  and use line of sight propagation.
• Infrared waves cannot pass through solid objects,
  like walls and be easily contained in a room.
• They are cheap, easy to build and do not require
  any government license to use them.
• IR waves offer very bandwidth for use.

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• Laser Transmission
• This type of transmission use thin laser to
  transfer data up to few kilometers.
• Laser beams are unidirectional, therefore this
  type of transmission system use line of sight
  propagation.
• In such a transmission system, a photo detector
  and laser is set on both sender and receiver
  side.
• Such a system offer very high band width at a
  very low cost.
• Other disadvantage is that on hot sunny days
  these waves are affected by hot turbulent air and
  miss the detector.
• The major problem in this transmission system is
  that laser beams cannot penetrate rain or thick
  fog.

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