TECHNOLOGY

EDUCATION =TECHNOLOGY

Technology is the collection of techniques, skills, methods and

processes used in the production of goods or services or in the

accomplishment of objectives, such as scientific investigation.

Simply, Technology means to explore(or)invent(or)innovate(or)discover

things

WIRELESS TECHNOLOGY

TOPICS TO BE DISCUSSED:

• Types of networks

• Types of WIRELESS technologies

• LI-FI technology

• Working process of LI-FI

• Comparison with WI-FI

• Advantages &Disadvantages of LI-FI

TYPES OF NETWORKS

NETWORK --- it is a group of two or more computer

systems linked together.

PAN LAN

MAN WAN

TYPES OF WIRELESS TECHNOLOGIES

BLUETOOTH Technology

WIMAX Technology

ZIGBEE Technology

WI-FI Technology

LI-FI Technology

Light – Fidelity

LI-FI is transmission of data through

illumination, sending data through a LED light

bulb that varies in intensity faster than human eye

can follow

German physicist , Dr. Harald Haas was first coined for

li-fi

In 2011 at university of EDINBURGH,UK

Working of LI-FIWORKING PRINCPAL OF LI-FI is based on VLC, I.e; which uses

visible light for data transmission

operational procedure is very

simple, if the led is on, you transmit a

digital 1, if its off you transmit a 0. The

LED’s can be switched on and off very

quickly, which gives nice opportunities

for transmitting data. Hence all that us

required is some LEDS and a controller

that code data into those LEDs. We

have to just vary the rate at which the

LED’s flicker depending upon the data

we want to encode

Thus every light source will

works as a hub for data

transmission

HOW IT WORKS ???

WHY WE USE ONLY VLC ???

FEATURE WI-FI LI-FI

FULL FORM Wireless Fidelity Light Fidelity

OPERATION WiFi transmits data using

radio waves with the help of

WiFi router.

LiFi transmits data using light with

the help of LED bulbs

INTERFERNCE Will have interference issues

from nearby access

points(routers)

Do not have any interference

issues similar to radio frequency

waves

TECHNOLOGY WLAN 802.11a/b/g/n/ac/ad

standard compliant devices

Present IrDA compliant devices

APPLICATIONS Used for internet browsing

with the help of wifi kiosks or

wifi hotspots

Used in airlines, undersea

explorations, operation theaters in

the hospitals, office and home

premises for data transfer and

internet browsing

ADVANTAGES Interference is more, can not

pass through sea water,

works in less dense region

Interference is less, can pass

through salty sea water, works in

dense region

PRIVACY In WiFi, RF signal can not be

blocked by the walls and

hence need to employ

In LiFi, light is blocked by the walls

and hence will provide more

secure data transfer

APPLICATIONS OF LI-FIWhenever we travel through airways weface the problem in communicationmedia,because the whole airwayscommunication are performed on thebasis of radio waves. To overcomes thisdrawback on radio ways , li-fi isintroduced.

Li-Fi can even wok underwater

were Wi-Fi fails completely, thereby

throwing open endless opportunities

for military/navigation operations.

ADVANTAGES & DISADVANTAGES

• ADVANTAGES:• Green information technology

• Lighting points Used as Hotspots

• Can be used in hospitals and even underwater

• High Security

• Easy To Use

• Fast Data Transfer

• Harmlessness

• Low-costDISADVANTAGES:• For instance light cannot pass through walls.• You cannot enjoy internet without light source (sun or bulb).• Li-Fi's biggest drawback apart from walls is inability to provide uninterrupted internet outdoor (Even during day) Sun light would interfere with its signal.• Its very difficult to create a whole new Infrastructure for Li-Fi.

Aditya institute of technology & management

Any queries???