What is Network or Transmission Media? Types Types of Transmission Media



What is Network or Transmission Media-Types Types of Transmission Media

 

NETWORK OR TRANSMISSION MEDIAS:

  • Data travel from one computer to other through some medium called transmission media or communication channels or communication media.
  • Medias is classified into two types

Bounded or Guided(In Bounded or Guided physical media is used. Such as cable system) Unbounded or Unguided(Unbounded or Unguided media is wireless. Signal is usually transmitted through air)

  • Communication media includes Standard Telephone Lines Coaxial Cables

Microwave Transmission Satellite Communication Fiber Optics Telephone Lines:

  • Telephone cable is used to access internet.
  • Normally used in WAN and MAN for data transmission.
  • It has low cost as compare to other transmission Medias.
  • Telephone lines are widely used as communication lines.
  • Data travel over these lines in the form of Analog signals.

Coaxial Cables:

  • These are made up of copper. A plastic layer provides insulation between the copper wire and metal shield. Metal shield helps to block any outside interference.
  • Transmission rate is 10 Mega bits per second (Mbps).
  • It is less expensive than Fiber Optic.
  • Mostly used for long distance transmission.
  • Provide high quality data transmission without distortion or loss of signal.
  • It can be classified in two categories

UTP (Unshielded Twisted Pair Cable)

  • It has maximum range of 100 meters (328 feet).
  • It consists of 2 or 4 twisted wire pairs.
  • Widely used in LANs.

STP(Shielded Twisted Pair Cable)

  • Same as UTP but it is covered with a shield for resistance.
  • It is more reliable and faster than UTP.
  • It covers long distance.
  • Normally used as a back bone cable.

Microwave Transmission:

  • These use air for data transmission.
  • Data transmit in the form of waves.
  • Very useful for lone distance communication.
  • It has high cost.
  • It is very difficult to install.
  • Data transmission speed is slow as compared to physical or guided Medias.
  • Transmitters are installed on high buildings.
  • Two stations must be within sight of one another.
  • Difficult to detect and remove errors.
  • Normally telecommunication companies use microwave signals for data transmission.

Satellite Communication:

  • Ideal for long distance communication.
  • Transmission speed is slow as compared to Coaxial and Fiber optic cables.
  • Satellites are placed about 22,000 miles above the earth.
  • This technique has very huge cost.
  • Difficult to install.
  • Data transmission in the form of waves.
  • It covers very large area of the earth.
  • There are many earth stations with antennas which receives/sends signals from satellite.
  • Satellites are launched either by rockets or by space shuttles.
  • Difficult to detect and remove errors.

Fiber Optics:

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