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Advantages of Satellite Link

(a) The area covered is quite large.
(b) No line-of-sight restrictions such as natural mountains, tall buildings, towers, etc.
(c) Earth station which receives the signals can be at a fixed position or can be relatively mobile.

Disadvantages of Satellite Link

(a) It is very expensive as compared to other transmission mediums.
(b) Installation is extremely complex.

(c) Signals sent to the stations can be interrupted by external interference.
(d) Low antenna gains result in overcrowding of available bandwidth.

4. Infrared

The type of transmission that uses infrared light to send data is known as infrared transmission. The
data is transmitted through air and can propagate in the open space; however, it cannot penetrate
the walls of the room. It is an example of short range wireless network. Infrared speed varies from
2.4 kbps to 16 mbps. A very good example of infrared transmission is a handheld remote control
such as remote control of a TV or AC, etc.

Housing Shield

Transmittor Transmittor
Reciever Reciever

Lens

Fig. 8.32: Infrared Transmission System

Advantages of Infrared Transmission

(a) It is a secure medium of transmitting data.
(b) It is a cheap mode of transmission.

Disadvantages of Infrared Transmission
Computer Networks
(a) It can work only for short distances.
(b) It cannot penetrate walls and is affected by distance, noise and heat.

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