Wireless LAN And Its
Overview Of WLAN
stands for Wireless Local Area Network. Firstly, WLAN’s Standard is published
by IEEE in July 1997. And then in September 1999, this standard is named as
IEEE 802.11 And 802.11b is ratified as high rate standard.
does not use any physical connection. It totally rely on Wireless communication
using Electromagnetic waves. And transmit data using electromagnetic waves. Now
a days 11Mbps data is transferred by Wireless Local Area Network. Today market
is also demand for wireless local area network. Because WLAN does not use any
Of Standards Of WLAN
sometimes known as LAWN which is called local area wireless network. Every
mobile user connect with local area network through wireless or radio connection. Mostly WIFI and
Bluetooth is used to built WLAN. A WLAN user must verified or authentication
process. Security is a problem of WLAN.WIFI
And Bluetooth are the indoor technologies examples of WLAN.
days hundred number of devices of wireless local area network exists. Due to
which to manage the these devices becomes difficult.
the Wireless Local Area Network Devices are listed below:
Advantages Of WLAN
are many benefits of WLAN which are listed below:
of the big and main advantage of WLAN is mobility. We can transfer data under a
given and specific range without using any physical connection. In organizations
data is transferred by using WLAN. Because WLAN transfer data efficiently.
transfer data in its given range efficiently. The typically WLAN node range is
100m. And move data from one access point to another.
Easy to Use:
LAN is easy to use. Because it
transparent to user operating system. And user must have information about its
new approaches(advancements) to take advantage of WLAN properly.
is scalable, in future we can enhance WLAN for our need by extending the nodes
of WLAN . And Coverage area can be
increased according to needs.
can share files and other data using wireless LAN more fastly and efficiently
instead of wired LAN.
of WLAN is less as compared to wired local area network. Because in Wired LAN
physical connections are required but in WLAN
no physical connection required. So its cost is less.
Disadvantages Of WLAN
there are many benefits of wireless local area network but there are also many
disadvantages of WLAN, which of them, some are listed below:
transformation is slower using WLAN S compared to Wired local area network file
Difficult To Set-up:
set-up a Wireless area network is difficult for a person which have no
technical information or experience with computer.
so many people are working on a single WLAN, then traffic become overloaded and
data transmission will be interrupted. Which is disadvantage of WLAN.
data sending and receiving will be interrupted due to flying objects using
Wireless local area network.
Uses Of WLAN
WLAN is used in many ways in our life. Some are
different hospitals, WLAN is used for quick diagnostic purposes in an emergency
situation. In hospitals WLAN is widely used.
business purposes WLAN are being used. For example if you want send an email on
argent basis to your client then you send your email or data using Wireless
schools WLAN are being used for educational purposes.
Wireless LAN VS Wired
network physical connections(cables) are involved, to set-up a Wired LAN
connection. Physical cable connects the computers to communicate with each
Wireless Network no cables are required to transfer data or to communicate with
one another. Communication will be done without any physical connection.
install(due to wires)
High (adapters, Routers
and optical fibers
Work on radio
Weak (data can be
chances to data encrypt)
No need of hub
Hubs and switches
Standards Of WLAN And Its
Advantage And Disadvantages
are some standards of WLAN developed by IEEE. Some of them are listed(will be discuss)
time 802.11 standard of WLAN is developed by IEEE in 1997. But this standard
does not fulfil the needs of the many users because its bandwidth is only 2Mbps
which is much less for most of the applications. So mostly it does not support
802.11b standard is expanded by previous standard 802.11.And its bandwidth is upto
11Mbps . That’s why, it gain much popularity than previous standard. And IEEE 802.11b
uses the frequency of 2.4GHz.
has the best signal range.
1. Data speed:
Transfer data speed is low
Uses the 2.4 gigahertz (GHz) of
3. One User
Provides access to only few users at a time duration.
second extension of previous(original) standard when IEEE 802.11b is I development.
But 802.11b got much popularity as compare to 802.11a standard.
standards are developed at the same time. 802.11b is best for home use and
802.11a is used for business purposes because 802.11a’s cost is high it is not
used for home purposes
is 54Mbps. And its frequency is 5GHz.
Uses up to Up to 54 Mbps
Fastest transmission speed.
Allows for more simultaneous users.
Uses the 5 GHz frequency.
frequencies prevent signal interference from other devices.
frequency radio waves are more easily absorbed by obstacles such as walls.
frequency band has poorer range Also, some countries, do not permit the use of
the 5 GHz ban.
Cost is high.
Is not compatible with 802.11b
network adapters, routers, and access points.
and 2003 another standard known as 802.11g developed. Which perform combine
functionality of previous standards (i.e 802.11a, 802.11b).
supports upto 54Mbps bandwidth and frequency of 2.4 GHz
Uses Up to 54 Mbps, Has a transmission
speed comparable to 802.11a under optimal conditions.
Allows for more
Has the best signal
range and is not easily obstructed
Is compatible with 802.11b network
adapters, routers, and access points
Uses the 2.4 GHz frequency so it
has the same interference problems as 802.11b
more than 802.11b
standard is designed to improve the previous standards(802.11a, 802.11b and
802.11). 802.11n is commonly known as Wireless ‘N’. Instead of one its bandwidth support multiple antenna
and wireless signals.
its increased signal density this standard offers better range over WIFI.
Compatible with more products
Works over a greater distance
Less prone to interference
Better signal recovery
Ready for next generation multimedia
is not yet finalized
more than 802.11g
use of multiple signals may greatly interfere with nearby 802.11b/g based
Characteristics Of IEEE
75 feet indoors; range can be affected by building materials.
Up to 11Mbps
150 feet indoors; range can be affected by building materials.
150 feet indoors; range can be affected by building materials.
feet indoors; range can be affected by building materials.
Wireless Standards and Speeds
The Wi-Fi Alliance is a global, non-profit
organization that helps to ensure standards and interoperability for wireless
networks, and wireless networks are often referred to as Wi-Fi The original
Wi-Fi standard (IEEE 802.11) was developed in 1997 by IEEE. Since then many
variations have emerged (and will continue to emerge). Wi-Fi networks use the