Table original standard.” “”802.11 standards” or the “802.11

Table of contents

WLAN IEEE
802.11……………………………………………………………………………………………………………….2

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Brief description of
802.11…………………………………………………………………………………………………..3

802.11a……………………………………………………………………………………………………………………………..3

802.11b……………………………………………………………………………………………………………………………..4

802.11g……………………………………………………………………………………………………………………………..5

802.11n……………………………………………………………………………………………………………………………..6

References……………………………………………………………………………………………………………………………………….7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IEEE 802.11

Definition :

“Wireless
LANs or WLANs communicate that is define by the set of standards(IEEE 802.11 )`.
The technology used in 802.11 is branded to consumers as Wi-Fi.”

“According
to the name , IEEE 802.11 is overseen by the IEEE, specifically the IEEE
LAN/MAN Standards Committee (IEEE 802). The current version now in use is of
802.11-2007.                    Actually,
there are technical steps for implementing Wi-Fi used by IEEE 802.11. Selling
products under this trademark is checked by an industry trade association named
as Wi-Fi Alliance.”

“The
U.S decide that IEEE 802.11 standards have its roots from a year 1985. Federal
Commission for Communication that opened up the ISM band which has no license
use. It was formally released in 1997. IEEE 802.11-1997 is a original standard.”                              

“”802.11 standards” or the “802.11 family of standards” are commonly
used. However to be more precise ,now this time only one standard existing is
(IEEE 802.11-2007) but many changes commonly known as amendments include
802.11a ,802.11b, 802.11g, and 802.11n.”

“This Linksys
WRT54GS Wi-Fi router from 2005 works on the 2.4 GHz “G” standard,
is able to transmit 54 megabits per second.”

” The Netgear
dual-band router from 2013 uses the AC standard, is able to transmit 1900
megabits per second.”

 

Brief Description:

“The 802.11 family consists
of a series of half-duplex over-the-air modulation techniques that use the same basic
protocol. The first wireless networking standard in the family was 802.11-1997
, but on market 802.11b was the first time widely accepted, supported by
802.11a, 802.11g, 802.11n, and 802.11ac. Other standards (c–f, h, j) are
service changes that are used to extend the idea of the existing standard.”

“802.11b and 802.11g both
use the 2.4 GHz ISM band ,now
it is operating in the United States under Part 15 of the U.S. Federal
Communications Commission Rules and Regulations. By using  this choice of frequency band, 802.11b and g
equipment and this suffering occasionally  interference of microwave ovens, cordless telephones and Bluetooth devices. 802.11b and 802.11g able to
control their interference and interference by using direct-sequence
spread spectrum 
and  OFDM signaling methods. 802.11a uses the 5 GHz
U-NII band,
For greater part of the world, offers at least 23 not able to interact with
channels instead of the 2.4 GHz ISM frequency band offering only three not
able to interact channels, where other types of adjacent channels interact. The
frequencies  with worst or better performance
are  higher or lower may be realized,
depending on the environment. 802.11n can use either the 2.4 GHz or the
5 GHz band; 802.11ac5  use GHz band only.”

 

Wireless
Standards 802.11a, 802.11b/g/n:

“802.11a is the first Wi-Fi wireless network communication standards which is created in the IEEE 802.11 standards family.”

History:

“The specification of 802.11a was signed(ratified) in
1999. At that time, the only other Wi-Fi technology was being able to
ready for the market were 802.11b. (The original 802.11 did not gain widespread
deployment due to its very  slow speed.)
802.11a and these other standards were incompatible, meaning that 802.11a
devices cannot interact  with the other
forms and vice versa.”

“A maximum 
bandwidth of 54 Mbps is supported by an 802.11a wireless network ,
significantly  better than the 11 Mbps of
802.11b and on par with what 802.11g would start to offer a few years
later. The 802.11a is an attractive technology due to its specifications, but
its performance is obtained by using relatively higher cost hardware.”

802.11a
and Wireless Signaling:

“In the 1980s for public use U.S. government  opened three specific wireless frequency
bands – 900 MHz (0.9 GHz), 2.4 GHz, and 5.8 GHz . 900 MHz proved
too low of frequency to be useful for data networking, although cordless phones used it.”

“Wireless spread spectrum radio signals in the 5.8 GHz
frequency range are  transmitted by
802.11a. This band was running in the U.S. and for a long time many countries,
meaning that 802.11a networks did not have to contend with signal interference
from other forms of transmitting devices. 802.11b networks use frequencies
in the often unregulated 2.4 GHz range and were much more susceptible to radio
interference from other devices.”