Wireless without using any physical connection. In organizations data

Wireless LAN And Its
Different Standards

Overview Of WLAN

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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.

WLAN
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
physical connection.

                                       Family
Of  Standards Of WLAN

 

802.11(DSSS)

802.11a

802.11b

Application

Wireless Ethernet
LAN

Wireless ATM

Wireless Ethernet

Data rate

1-2 Mbps

20-25Mbps

5.5Mbps, 11Mbps

Frequency range

2.4GHz

5GHz

2.4GHz

 

WLAN(Wireless Local
Area Network)

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.

WLAN Devices

Now a
days hundred number of devices of wireless local area network exists. Due to
which to manage the these devices becomes difficult.

Some of
the Wireless Local Area Network Devices are listed below:

1.     
Cell
phones

2.     
Tablets

3.     
Laptops

4.     
Gaming
consoles

5.     
Different
Audio Systems

 

 

 

Advantages Of WLAN

There
are many benefits of WLAN which are listed below:

1.     
Mobility:

One
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.

2.     
Coverage Range:

WLAN
transfer data in its given range efficiently. The typically WLAN node range is
100m. And move data from one access point to another.

3.     
Easy to Use:

Wireless
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.

4.     
Scalability:

WLAN
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.

5.     
Sharing Files:

User
can share files and other data using wireless LAN more fastly and efficiently
instead of wired LAN.

6.     
Cost:

Cost
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

Although
there are many benefits of wireless local area network but there are also many
disadvantages of WLAN, which of them, some are listed below:

1.     
Speed:

File
transformation is slower using WLAN S compared to Wired local area network file
transformation.

2.     
Difficult To Set-up:

To
set-up a Wireless area network is difficult for a person which have no
technical information or experience with computer.

3.     
Traffic Overloaded:

If
so many people are working on a single WLAN, then traffic become overloaded and
data transmission will be interrupted. Which is disadvantage of WLAN.

4.     
Flying Objects:

Sometimes
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
listed below:

HealthCare:

In
different hospitals, WLAN is used for quick diagnostic purposes in an emergency
situation. In hospitals WLAN is widely used.

In
Business:

For
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
area network.

In
Schools:

In
schools WLAN are being used for educational purposes.

Wireless LAN VS Wired
LAN

In wired
network physical connections(cables) are involved, to set-up a Wired LAN
connection. Physical cable connects the computers to communicate with each
other.

But in
Wireless Network no cables are required to transfer data or to communicate with
one another. Communication will be done without any physical connection.

characteristics

Wireless
Network

Wired
Network

Speed

Low

High

Installation

Easy

Difficult to
install(due to wires)

Cost

High (adapters, Routers
are expensive)

Low(only cables
required)

Cables

Ethernet, copper
and optical fibers

Work on radio
waves

Security

Weak (data can be
encrypted)

Strong (less
chances to data encrypt)

Hub
and switches

No need of hub
and switches

Hubs and switches
are Required

Standards

802.11a
802.11b
802.11g

802.3

Standards Of WLAN And Its
Advantage And Disadvantages

There
are some standards of WLAN developed by IEEE. Some of them are listed(will be discuss)
below:

802.11:

First
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
many applications.

802.11b:

In 1999,
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.

Advantages:

1.      Speed:

       11Mbps

2.      Costs:

        Less

3.      Signal
Range:

        has the best signal range.

Disadvantages:

1.       Data speed:

                Transfer data  speed is low

2.      Frequency:

         Uses the 2.4 gigahertz (GHz) of
frequency

3.       One User
Access:

               Provides access to only  few users at a time duration.

802.11a:

IEEE developed
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.

Both
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

802.11a bandwidth
is 54Mbps. And its frequency is 5GHz.

 

 

 

Advantages:

1.      Speed:

            Uses up to Up to 54 Mbps

 

2.     
Speed:

            Fastest transmission speed.

3.      Simultaneous
users:

           Allows for more simultaneous users.

4.      Frequency:

           Uses the 5 GHz frequency.

5.      Interference:

regulated
frequencies prevent signal interference from other devices.

Disadvantages:

1.      Higher
Frequency:

a.      
Higher
frequency radio waves are more easily absorbed by obstacles such as walls.

b.     
Higher
frequency band has poorer range Also, some countries, do not permit the use of
the 5 GHz ban.

2.     
Highest cost:

              Cost is high.

3.     
Compatibility:

             Is not compatible with 802.11b
network adapters, routers, and access points.

802.11g:

In 2002
and 2003 another standard known as 802.11g developed. Which perform combine
functionality of previous standards (i.e 802.11a, 802.11b).

This standard
supports upto 54Mbps bandwidth and frequency of 2.4 GHz

Advantages:

1.      Speed:

                        Uses Up to 54 Mbps, Has a transmission
speed comparable to 802.11a under                           optimal conditions.

2.      Simultaneous
users:

Allows for more
simultaneous users

3.      Best
Signal Range:

Has the best signal
range and is not easily obstructed

4.      Compatibility:

            Is compatible with 802.11b network
adapters, routers, and access points

Disadvantages:

1.      Interference
problems:

              Uses the 2.4 GHz frequency so it
has the same interference problems as 802.11b

 

2.     
Cost:

               Costs
more than 802.11b

802.11n:

802.11n
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.

Due to
its increased signal density this standard offers better range over WIFI.

Advantages:

Compatible with more products
Faster
Works over a greater distance
Less prone to interference
Better signal recovery
Better security
Ready for next generation multimedia
Scalable

Disadvantages:

1.     
Standard
is not yet finalized

2.     
costs
more than 802.11g

3.     
The
use of multiple signals may greatly interfere with nearby 802.11b/g based
networks.

 

Characteristics Of  IEEE 
Standards

IEEE
Standard

Frequency/Medium

Speed

Transmission
Range

802.11

2.4GHz
RF

1 to
2Mbps

20
feet indoors.

802.11a

5GHz

Up to
54Mbps

25 to
75 feet indoors; range can be affected by building materials.

802.11b

2.4GHz

Up to 11Mbps

Up to
150 feet indoors; range can be affected by building materials.

802.11g

2.4GHz

Up to
54Mbps

Up to
150 feet indoors; range can be affected by building materials.

802.11n

2.4GHz/5GHz

Up to
600Mbps

175+
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
Ethernet protocol.

 

Standard

Max Speed

Typical Range

802.11a

54 Mbps

150 feet

802.11b

11 Mbps

300 feet

802.11g

54 Mbps

300 feet