D-Link DSL-G684T Manual de usuario descargar pdf (Pagina 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

802.11

protocol

Release

Freq.

(GHz)

Bandwidth

(MHz)

Data rate (Mbit/s)

Approximate range

indoor

Outdoor

Jun

1997

2.4

1, 2

100

Sep

1999

6, 9, 12, 18, 24, 36,

48, 54

120

3.7

5000

Sep

1999

2.4

5.5, 11

140

June

2003

2.4

6, 9, 12, 18, 24, 36,

48, 54

140

Oct

2009

2.4/5

7.2, 14.4, 21.7,

28.9, 43.3, 57.8, 65,

72.2

250

15, 30, 45, 60, 90,

120, 135, 150

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

http://standards.ieee.org/findstds/interps/

http://www.ieee802.org/

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