k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 [size=5][b]IEEE 802.11b[/b][/size] was ratified in 1999. It operates in the 2.4-GHz ISM band that is available worldwide. The standard specifies one RF transmission: direct sequence spread spectrum (DSSS). It provides four data rates up to 11 Mbps: 1, 2, 5.5, and 11 Mbps. The 802.11b standard is the most commonly deployed WLAN standard. Quote Link to comment Share on other sites More sharing options...
robo Posted October 24, 2011 Report Share Posted October 24, 2011 k Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 [img]http://i55.tinypic.com/2daej9s.png[/img] There are 11 channels available in the United States. However, only three of these channels are nonoverlapping. In the ETSI domains, there are 13 available channels, but again there are only three nonoverlapping channels. [img]http://i51.tinypic.com/2nqy4k1.png[/img] An access point on channel 1 does not share frequencies with an access point on channel 6 because the channels do not have any common frequencies. Three access points in the same cell on three nonoverlapping channels (for example, 1, 6, and 11) provide an aggregated data rate for the cell of 33 Mbps (3 x 11Mbps), with an aggregated throughput of about 16 Mbps (half of the aggregate). If the same three access points shared the same channel, the aggregate data rate would still be 11 Mbps, but the aggregated throughput would be closer to 6 Mbps. Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 AP Coverage: [img]http://i52.tinypic.com/25rcehk.png[/img] WLAN clients have the ability to shift data rates while moving. This technique allows the same client operating at 11 Mbps to shift to 5.5 Mbps, 2 Mbps, and finally still communicate in the outside ring at 1 Mbps. Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 The[b][size=5] 802.11a[/size][/b] standard was ratified at the same time as 802.11b. Provides up to a 54-Mbps data rate. Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 The [b][size=5]802.11g[/size][/b] WLAN standard was ratified in June 2003. The aim was to provide higher data rates than the 802.11b standard. By using the 2.4-GHz band, backward compatibility was possible with existing 802.11b WLANs. The 802.11g standard uses the same three nonoverlapping channels: 1, 6, and 11. The 802.11g standard provides full backward compatibility with 802.11b. 802.11g Problems with 802.11g: [img]http://i53.tinypic.com/25qvfw1.png[/img] Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 [size=5][b]802.11 Standards Comparison: [/b][/size] [img]http://i53.tinypic.com/2lifpmp.png[/img] Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 [size=5][b]Range comparison :[/b][/size] [img]http://i51.tinypic.com/ojnp68.png[/img] Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 [size=5][b]WLAN Security : [/b][/size] [img]http://i54.tinypic.com/apfkg8.png[/img] Quote Link to comment Share on other sites More sharing options...
k2s Posted October 24, 2011 Author Report Share Posted October 24, 2011 [size=5][b]How does a client associated with Access Points :[/b][/size] [img]http://i51.tinypic.com/2rr1gxw.png[/img] Quote Link to comment Share on other sites More sharing options...
ding Posted October 25, 2011 Report Share Posted October 25, 2011 endi vayya nee istamunapudu chepthunav classes Quote Link to comment Share on other sites More sharing options...
k2s Posted October 25, 2011 Author Report Share Posted October 25, 2011 [quote name='shakkku' timestamp='1319502409' post='3027735'] endi vayya nee istamunapudu chepthunav classes [/quote] [img]http://pictures.picasion.com/pic16/0673580f85eefed43e8e56d194bcf370.gif[/img] Quote Link to comment Share on other sites More sharing options...
ToughGuy Posted October 25, 2011 Report Share Posted October 25, 2011 [quote name='shakkku' timestamp='1319502409' post='3027735'] endi vayya nee istamunapudu chepthunav classes [/quote] chepthe cheppinchukovali ..no questions --pokiri [img]http://www.gifsoup.com/view6/2540027/maddy-o.gif[/img] Quote Link to comment Share on other sites More sharing options...
ding Posted October 25, 2011 Report Share Posted October 25, 2011 wireless vlan support???????/ layer 2 & 3 roaming guinchi seppu Quote Link to comment Share on other sites More sharing options...
k2s Posted October 27, 2011 Author Report Share Posted October 27, 2011 [quote name='shakkku' timestamp='1319503280' post='3027794'] wireless vlan support???????/ layer 2 & 3 roaming guinchi seppu [/quote] Quote Link to comment Share on other sites More sharing options...
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