Page 107 - Viva ICSE Computer Studies 8 : E-book

Core is the innermost part made up of strands of glass fi bres. The data in the form of light is
propagated through the core which is surrounded by a glass. The glass cladding is protected
from damage and moisture by a thin plastic jacket. A signal sent through fi bre-optic cable can
travel to longer distances (about 30 km) and are free from interference. As fi bres do not leak
light, they are diffi cult to tap. Hence, they provide excellent security to data against potential
wire tappers.

Wireless Networking Technology (Unguided Medium)

Data can be transmitted between computers and other electronic devices through air or
vacuum. Such transmission is called wireless communication. Let’s learn more about it.

Bluetooth
Bluetooth is a protocol for exchanging data over short distances using radio
waves. Such type of wireless network is called personal area network (PAN).
Bluetooth allows you to remotely access and use devices on a computer or
phone without wires.

It was initially used for connecting headsets to a mobile phone and regular computers.
Now, besides being used with mobile phones, bluetooth technology is also compatible with
personal computers, laptops, printers, digital cameras,

telephones and other devices. As bluetooth signals Learn More
travel through walls, windows and doors, you can use The term bluetooth was coined after
this technology to transfer data and signals within the the Danish and Norwegian king
entire house. Harald Bluetooth Gormsson.

Infrared Technology

Infrared technology is for short range communication that covers a range of around 5 metres.
As the infrared waves do not pass through solid walls, an infrared system
in one room of a building does not interfere with similar systems in
adjoining rooms.

The remote control used on televisions, VCRs and stereos use infrared
waves. Some laptops also have infrared devices for exchanging data
with desktops, and peripherals such as keyboards and printers.

Wi-Fi

Wi-fi stands for wireless fi delity. It allows electronic devices like laptops, video game consoles,
smartphones, tablets and digital audio players to exchange data using radio waves over a
wireless network including high-speed Internet connections. Wi-fi
network is commonly used at home. A wireless router and high speed
Internet are required for wi-fi connection. In some cases, an Internet
service provider may supply a wireless router/modem combination
when you subscribe to their service. It has high power consumption.

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