Computer Networking

Transport Layer

Guided Transmission Media

Guided transmission media connects the multiple devices physically through wires. It is also called bounded or physical media. 

Types of Guided Media

There are there major types of Guided Media 

  • Twisted Pair Cable
  • Coaxial Cable
  • Fiber Optic Cable

1. Twisted Pair

  • Twisted pair is a guided media made up of a pair of cables twisted with each other. Twisting of wires protects them from interference by external electromagnetic waves.

  • Increasing the number of turns per foot decreases noise interference.
  • Twisted pairs are two types, one is Shielded twisted pair (STP) and other is unshielded twisted pair (UTP).

  • Unshielded Twisted pairs are available in different categories (1 to 6) have data transfer speed is 4MB to 200MB per second.
  • Due to Mesh around the wire the STP is expensive, higher capacity, safe and higher data transmission rate than UTP.
  • Twisted pair are easy to install to transfer data for short distance and inexpensive.

2. Coaxial Cable

  • It consists of copper wire (conductor) covered by insulating material. Insulated copper wire is covered by copper mesh (shield). Copper mesh protects the internal copper wire from external interference.

  • More expensive and provide higher data transfer rate than twisted cable.

3. Fiber Optic

  • It is use to send the data by pulses of light. Fiber optic contains three main components
  • Core: A core is a light transmission area which consists of thin strands of glass or plastic. These strands are thin like human air.
  • Cladding: It provides the lower refractive index, so that the light waves are transmitted through the fiber.
  • Jacket: cladding is further protected by a plastic coating called jacket. It absorbs shock and provides extra fiber protection.
  • The Speed, reliability, security is high than coaxial cable and not affected by electromagnetic waves. But it is difficult to install and expensive as well as compare to coaxial cable.

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