Page 226 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

GHz can cover a big range of areas to spread the Wi-Fi signal but the frequency is low, so in simple words, the
speed of the internet is less and 5 GHz bandwidth is for a lower range of area but the frequency is high so the
speed is very high.
Let’s say, if there is an internet connection of 60 MB/s bandwidth, then for 2.4 GHz bandwidth, it provides approx
30 to 45 MB/s of bandwidth connection and for 5 GHz bandwidth, it provides approx 50 to 57 MB/s bandwidth.

Then in 1990, IEEE 802.11 Working Group for Wireless LANs is established by Vic Hayes, who was known as
the “Father of WiFi”.
Applications of Wi-Fi :

Wi-Fi has many applications, it is used in all the sectors where a computer or any digital media is used,
also for entertaining Wi-Fi is used.
Accessing Internet: Using Wi-Fi we can access the internet in any Wi-Fi-capable device wirelessly.

We can stream or cast audio or video wirelessly on any device using Wi-Fi for our entertainment.
We can share files, data, etc between two or more computers or mobile phones using Wi-Fi, and the speed of
the data transfer rate is also very high. Also, we can print any document using a Wi-Fi printer, this is very much
used nowadays.
We can use Wi-Fi as HOTSPOTS also, it points Wireless Internet access for a particular range of area. Using
Hotspot the owner of the main network connection can offer temporary network access to Wi-Fi-capable devices
so that the users can use the network without knowing anything about the main network connection. Wi-Fi adapters
are mainly spreading radio signals using the owner network connection to provide a hotspot.
Using Wi-Fi or WLAN we can construct simple wireless connections from one point to another, known as Point to
point networks. This can be useful to connect two locations that are difficult to reach by wire, such as two buildings
of corporate business.
One more important application is VoWi-Fi, which is known as voice-over Wi-Fi. Some years ago telecom
companies are introduced VoLTE (Voice over Long-Term Evolution ). Nowadays they are introduced to VoWi-Fi,
by which we can call anyone by using our home Wi-Fi network, only one thing is that the mobile needs to connect
with the Wi-Fi. Then the voice is transferred using the Wi-Fi network instead of using the mobile SIM network, so
the call quality is very good. Many mobile phones are already getting the support of VoWi-Fi.

Wi-Fi in offices: In an office, all the computers are interconnected using Wi-Fi. For Wi-Fi, there are no wiring
complexities. Also, the speed of the network is good. For Wi-Fi, a project can be presented to all the members at
a time in the form of an excel sheet, ppt, etc. For Wi-Fi, there is no network loss as in cable due to cable break.
Also using W-Fi a whole city can provide network connectivity by deploying routers at a specific area to access the
internet. Already schools, colleges, and universities are providing networks using Wi-Fi because of its flexibility.

Wi-Fi is used as a positioning system also, by which we can detect the positions of Wi-Fi hotspots to identify a
device location.
Types of Wi-Fi:

Wi-Fi has several types of standards, which are discussed earlier, here just the name of the standards are defined,
Year of
Standards Description
Release
Wi-Fi-1 1999 This version has a link speed from 2Mb/s to 11 Mb/s over a 2.4 GHz
(802.11b) frequency band
Wi-Fi-2 1999 After a month of release previous version, 802.11a was released and it
(802.11a) provide up to 54 Mb/s link speed over 5 Ghz band
Wi-Fi-3 2003 In this version the speed was increased up to 54 to 108 Mb/s over 2.4 GHz
(802.11g)
This is the same as 802.11g but only the security mechanism was increased
802.11i 2004
in this version
This is also the same as 802.11g, only Voice over Wireless LAN and
802.11e 2004
multimedia streaming are involved

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