Transmission Media

It is a communication channel which carries information from sender to receiver. They are also called communication channels.

It is of two types:-

Guided and Unguided media

Guided Media

1. Twisted Pair Cable
2. Coaxial Cable
3. FibreOptics

1. Twisted Pair Cable

• In this transmission media two copper wires are twisted together
• Twisting reduces the electromagnetic interference
• They might be shielded further to reduce the noise in the connection shielded twisted pair (STP) and without a shielded twisted pair (UTP).

1. Coaxial Cable

• This is the cable which was used in the tv earlier
• It is a well-insulated wire so the interference can be reduced to as much as possible
• Its core is a thin conducting copper wire

1. Fibre Optics

• This data is transferred at the speed of light which is approximately 300000 m/s or 300 km/s 🤯
• Its main core is made up of thin glass wire which is about the thickness of human hair.
• They are also safe as there is no current no electromagnetic interference
• This also helps us achieve higher speeds such as 1Gbps or even more

Unguided media

This transmission media is also known as wireless transmission and doesn’t require any physical medium

This is of 3 types:-

Radio Transmission

• Work on low frequency i.e 3KHz - 1GHz
• Due to low frequency they, can also penetrate the wall to travel inside the building

Microwave Transmission

• Frequency is 1-300GHz

Infrared Transmission

• It has the highest frequency of all i.e 300GHz - 400THz
• Due to high frequency it cannot penetrate the walls
• They are far more secure

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