Basic CS-Networks [TCS Placement]: Sample Questions 17 - 17 of 133

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Question 17


Describe in Detail


What are the categories of transmission media?


Bounded/Guided Media

Bounded media or guide media are physical links that confine signals to narrow path. They are made up of an external conductor (copper) bounded by jacket material. They are used in labs because of high speed, good security, and low cost. They however cannot be used in long distance communication.

  • Twisted-pair (TP) cable
    • The most popular network cable is twisted pair- light-weight, easy to install, inexpensive and supports many network types.
    • Supports speed of 100 mps.
    • Made of pairs of solid or stranded copper twisted along each other.
    • There are two types of twisted pairs cabling
  • Shielded TP

    It is similar to TP but a mesh shielding protects signal from EMI allowing higher transmission rate.

  • Unshielded TP

    UTP is more common- can be either voice grade or data grade depending on the condition.

  • Coaxial Cable

    Coaxial cable is very common & widely used. For example, TV wire.

  • Fiber-optic cable

    Fiber optic cable uses light to transmit data. Since light only moves in one direction for two-way communication a second connection must be made between the two devices. Each stand is responsible for one direction of communication.

Given the Image is Define The

Unguided Media

  • It has a very low frequency.
  • Used for data communication when wireless keyboards, mouse and printers are used.

Terrestrial Microwave

  • Terrestrial microwave transmissions are sent between two microwave stations on the earth.
  • Common for long-distance communication.
  • Operate in the low gigahertz range.
  • A parabolic dish focuses a narrow beam onto a receiver antenna.
Given the Image is Define the Terrestrial Microwave Part of Unguided Media

Satellite Communication

  • Communication satellite, which links ground stations, operates on a number of frequency bands, called transponder channels.
  • Receivers receive on one frequency band and transmit on another frequency.
Given the Image is Define the Satellite Communication

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