Computer Networking

Transport Layer

Transmission Media

Transmission media is the part of physical layer which provides a path through which data is transmitted from one place to another. It is also known as transmission channel, Communication media or communication channel.


  • Amount of data that can be transferred through a communication medium in a unit time is called bandwidth.
  • Bandwidth of digital signal is measured in bits per second or bytes per second.
  • Bandwidth of Analogs signal is measured in cycles per second or Hertz.

Types of Transmission Media

There are two major types of Transmission Media. One is Physical medial and other is wireless.

Physical transmission media is known as Guided Transmission Media and Wireless transmission media is known as Unguided Transmission Media. Descriptive diagram of transmission media is given below.

In upcoming lectures, we will see types of transmission media in detail.

Transmission Impairment 

There are three major types of transmission impairment, explain under

  • Attenuation: The strength of the signal decreases when increasing the distance which causes the loss of energy.
  • Distortion: Distortion occurs when there is a change in the shape of the signal. Changing the shape of signal means signal change its amplitude.
  • Noise: When data is travelled over a communication medium then some unwanted signals may added to it which creates the noise.



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