Page 227 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Wi-Fi-4 2009 This version supports both 2.4 GHz and 5 GHz radio frequency and it offers
(802.11n) up to 72 to 600 Mb/s speed
Wi-Fi-5 2014 It supports a speed of 1733 Mb/s in the 5 GHz band
(802.11ac)
A new version will release in 2020 named 802.11ax developed by Huawei, which can support, a maximum of 3.5
Gb/s. it will know Wi-Fi 6.
Wi-Fi working:
Wi-Fi is a wireless technology for networking, so it uses Electromagnetic waves to transmit networks. We know
that there are many divisions of Electromagnetic waves according to their frequency such as X-ray, Gamma-ray,
radio wave, microwave, etc, in Wi-Fi, the radio frequency is used. For transmitting Wi-Fi signal there is three
medium,
Base station network or an Ethernet(802.3) connection: It is the main host network from where the network
connection is provided to the router.
Access point or router: it is a bridge between a wired network and a wireless network. It accepts a wired
Ethernet connection and converts the wired connection to a wireless connection and spreads the connection as
a radio wave.
Accessing devices: It is our mobile, computer, etc from where we use the Wi-Fi and surfing internet.
All the electronics devices read data in binary form, also router or our devices, here routers provide radio waves
and those waves are receive by our devices and read the waves in binary form. We all know how a wave looks
like, the upper pick of the wave is known as 1 and the lower pick of the wave is known as 0 in binary.

Advantages of Wi-Fi:
It is a flexible network connection, no wiring complexities. Can be accessed from anywhere in the Wi-Fi range.

It does not require regulatory approval for individual users.
It is salable, can be expanded by using Wi-Fi Extenders.
It can be set up in an easy and fast way. Just need to configure the SSID and Password.
Security in a high in Wi-Fi network, its uses WPA encryption to encrypt radio signals.
It is also lower in cost.

It also can provide Hotspots.
it supports roaming also.
Disadvantages of Wi-Fi:
Power consumption is high while using Wi-Fi in any device which has a battery, such as mobile, laptops, etc.

Many times there may be some security problems happening even it has encryption. Such as many times has
known devices become unknown to the router, Wi-Fi can be hacked also.

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CITS : E & H - Electronics Mechanic - Lesson 130 - 145