let you know about the medium which used some of them to establish the connection through network. transmission media or medium are of two types one is guided another is unguided both have their role to connect with peoples or network.
5. Guided Media
3Types of Guided Media
1. Twisted Pair Cable
2. Coaxial Cable
3. Fiber Optic Cable
Guided media, which are those that provide a
conduit from one device to another, include
twisted-pair cable, coaxial cable, and fiber-
optic cable.
12. Unguided Media
Unguided media transport electromagnetic waves without
using a physical conductor. This type of communication is
often referred to as wireless communication.
Radio Waves
Micro Waves
Infrared Wave
Topics discussed in this section:
17. Radio WaveTransmission System
Radio waves have frequencies between 3 kHz and 1 GHz
Radio waves used for following Application
AM radio
FM radio andTV
Wireless LAN
RF bands are Licensed and Unlicenced
Radio waves can brodcast omnidirectionally or
directionally
19. Microwave Transmission System
Microwaves have frequencies between 1 GHz to 300 Ghz
Micro waves used for following Application
AM radio
FM radio andTV
Wireless LAN
Microwaves are basically unidirectional
Microwave propagation is Line of sight propogation
It support high data rate due to high fre band
There are two types
1.Terrestrial
2. Satellite
21. Infrared waves
• The electromagnetic waves having frequencies from
300 GHz to 400THz are known as infrared waves
• IR uses Line of sight propagation
• It cannot penetrate walls
• much reduced interference and possibility of reuse
same freq band in different rooms
• IR waves have very large bandwidth
• Sun generates radiation in the infrared bandcause
interference to IRThey may be used in development of
very high speed wireless LAN in future.
• FCC licence is not required to use it.