User manual

10
2Mbps. The third generation which we use nowadays operates on the same band as the
second generation, 2,4GHz.
The world first official standard IEEE 802.11 with data rates of 1 and 2 Mbps was
established in 1997 seven years after IEEE 802 Executive Committee established the
802.11 Working Group to create a wireless local area network (WLAN) standard.
That is 
series of over-the-air modulation techniques that use the same basic protocol. The most
popular are defined by 802.11b and 802.11g protocols. The most up to date protocol is
802.11n but due to relatively expensive devices it is not as popular as previous versions.
802.11 network standards
2
802.11
protocol
Release
Freq.
(GHz)
Bandwidth
(MHz)
Data rate (Mbit/s)
Approximate range
indoor
Outdoor
-
Jun
1997
2.4
20
1, 2
20
100
a
Sep
1999
5
20
6, 9, 12, 18, 24, 36,
48, 54
35
120
3.7
-
5000
b
Sep
1999
2.4
20
5.5, 11
38
140
g
June
2003
2.4
20
6, 9, 12, 18, 24, 36,
48, 54
38
140
n
Oct
2009
2.4/5
20
7.2, 14.4, 21.7,
28.9, 43.3, 57.8, 65,
72.2
70
250
40
15, 30, 45, 60, 90,
120, 135, 150
70
250
As we can see in the chart above we will focus only on protocol versions that are or
that were used in wlan european networks. All the other can be found on the website of
IEEE 802.11 Executive Committee
3
.
2
http://standards.ieee.org/findstds/interps/
3
http://www.ieee802.org/