Page 18 - KEC Khaitan C8.3 Flipbook
P. 18
Coaxial Cable: It contains a central conductor
surrounded by an insulator and a shield. It is used
to connects satellite dishes to TV receivers and
to connect cable modems to the internet service
provider.
Fiber Optic Cable: It uses glass or plastic fibers to
transmit light pulses. It is used to provide very fast
internet connections.
UNGUIDED TRANSMISSION MEDIA
The unguided transmission media are categorised into two types: long distance wireless and
short distance wireless media.
Long Distance Wireless Media
It can support communication over longer distances up to thousands of kilometres. Long distance
wireless communication media includes microwaves, radio waves, and satellites.
Microwaves: It refers to microwave radio transmission which is commonly used to send signals
from the earth to the satellites and vice-versa. These wavers are also used for deep space
communications, radar systems, radio astronomy, etc.
Radio waves: These waves are commonly used for long distance communication or sending
messages, information for communication for aircraft or naval communication. The information
is sent in the form of electromagnetic waves.
Short Distance Wireless Media
Short distance wireless communication media includes Wi-Fi, Bluetooth, and satellites.
Wi-Fi: It stands for Wireless Fidelity, which lets you connect to the Internet without any wired
connection from your PC. It is a popular form of wireless connection as it does not require
cables.
It can be used to get connected through a variety of
devices like laptops, digital cameras, smartphones, gaming
consoles, etc. To connect to a Wi-Fi network a hotspot is
required. The hotspot acts as a gateway to the Internet, you
need to connect to hot-spot to be able to connect to the
Internet.
Bluetooth: This wireless technology creates a small wireless
network called Personal Area Network between personal
computers and peripheral devices such as printers, mouse,
keyboards, headphones, etc. It is used to exchange data
over a short distance from fixed or mobile devices.
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