Unguided Media | Types of Unguided Media
| What are the types of unguided media?| What are unguided media? | What is unguided media and its types? | What are the types of unguided media? | What are the types of wireless transmission media?
What are unguided media?
An unguided communication medium transmits the information through the air in much the same way as radio stations broadcast their programming. They are also called unbound wireless transmission media or unguided transmission media because they do not use any physical wire or a closed circuit for data communication.
For eg. microwave, satellite, radio broadcast, infrared, etc.
What are the types of unguided media?
Microwaves are unguided communication media that use a high-frequency band of a radio broadcast transmission to transmit the data through space (wireless communication). It uses dish-shaped antennae for sending and receiving the information. Microwaves are called line-of-sight because the microwave signal cannot bend around the surface of the earth. Hence, the transmitter and receiver of a microwave system, mounted on a very high tower should be in line with sights. This type of communication is not possible for distance communication. When microwaves are used for longer distances, a separate device called repeater is used to amplify the signals because the signals become weaker after traveling certain distances.
Microwave systems have a speed of about 16 Gigabits per second. A microwave system can support about 250,000 voice channels simultaneously. The microwave installation cost is very high as compared to other guided communication media.
These are basically microwave transmission systems in space. A satellite is an amplifier or repeater that receives information from one location on the earth, repeats the data, and sends it to one or more receiving locations on the earth. Satellite communication media are very cost-effective for moving large amounts of information, especially where there are many receiving locations.
Data transmission costs are independent of distances between two points as long as these two points are within the satellite coverage area. Satellite communication does not need any cables and associated costs for land digging. However, the initial cost for setting up the satellite is very high. Satellite communication is the fastest communication medium than others.
Radio Broadcast is an unguided communication medium similar to microwaves and satellite except that the receiving locations need not be in the line of sight or have a dish-shaped antenna to receive information transmission.
Infrared is an unguided communication medium that uses a red light (below the human eye) to transmit information. The common application is in television and VCRs with remote control. In the area of the network, infrared is used to connect the local area network in the same room and to connect a computer with peripheral devices such as a mouse, keyboard, etc.
It is a low cost, low power, wireless radio frequency technology that allows various devices to communicate with each other. One of the advantages of Bluetooth over infrared is that close proximity between the communication devices is not required and distance of up to 10 meters or 32 feet is allowed.
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