What is Transmission Media

Transmission Media :- When we create a computer network then we need to communication medium this medium can be wired or wireless.

There are two type of transmission media:-
# Wired medium or Guided medium.
# Wireless medium or unguided medium.

Wired Medium

§  Twisted Pair Cable

§  Co-axial Cable

§  Fiber Optic Cable

Wireless Medium

§  Radio Wave

§  Micro Wave

Wired Medium :- This type of media data can be transmit over the wire and we can configure or see it.

1) Twisted Pair Cable :- In its simplest form, twisted-pair cable consists of two insulated copper wires, the wires are twisted together in a helical shape. Twisted Pair Cable are commonly used in LAN and telephone network for data transmission over short distance up to 1 KM.

There are two types of twisted pair cable:
#  UTP (Unshielded Twisted Pair).
# STP (Shielded Twisted Pair).

2) Co-axial Cable :- Coaxial cabling has a single copper conductor at its center. This cable just like TV cables but Two kinds of Coaxial cable are widely used. First is 50-ohm cable. It is used for digital transmission and second is 75-ohm cable, it is used for analog transmission. Example RG-58, RG-6, RG-59.

3) Optical Fiber Cable :- Optical Fiber is the newest form of transmission media. The fiber-optic cable transmits light signals rather than electrical signals. Optical Fiber cable has an inner core of glass that conducts light. Today Optical cable have available single mode or multi mode cable.

Wireless Medium :- This type of media data can be transmit over the waves.

1) Radio Wave :- Radio Waves have frequencies between 10 KHz and 1 GHz. Radio waves use in television and FM radio.

2) Micro Wave :- Microwave transmission depends on weather and frequency. The frequency band of 10 GHz is in the routine use. Microwave is widely used for long-distance telephone communication, cellular telephones, television distribution.

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