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WLAN - Basic Knowledge

WLAN - Wireless Local Area Network - meanspoints;
technology which allows to build wireless
data networks with satisfactory parameters- 802.11i - standard defining new security
and quite large range of operation at amethods  in  wireless  networks;
comparatively low cost. Additional advantage
of this technology is short time needed for- 802.11n - standard for transmitting
its  implementation.multimedia in homes using MIMO technology, up
to  300  Mbps;
Potentiality  of  WLAN:
- 802.11e - standard defining QoS - support
* wireless access to local network in home,for  high  quality  of  services;
office,  business  etc.
- 802.16 - WiMax standard for backbone
* wireless access to the Net in public space,networks  of  high  capacity.
e.g. in airports, stations, cafes etc.
(hot-spot)Wireless  network  range
* wireless point-to-point links (connectingIt should be realized that the range of a
LAN networks, telemetry, remote control,wireless network depends on many factors. We
remote  monitoring)can have an influence on some of them and the
rest is unknown. The range of wireless
* wireless access to the Internet (both innetwork  depends  on:
cities  and  in  the  country)
-  output  power
* emergency communications link (duplication
of  wired  network)-  cable  attenuation
Standards:-  gain  of  antennas
- 802.11a - in 5 GHz band: 5.150 - 5.350 GHz-  sensitivity  of  devices
and 5.470 - 5.725 GHz, transfer rate up to 54
Mbps;-  attenuation  between  antennas
- 802.11b - in 2.4 GHz band: 2.4 - 2.483 GHz,-  interferences  from  other  devices
transfer  rate  up  to  11  Mbps;
- influence of physical barriers (walls,
- 802.11g - in 2.4 GHz band: 2.4 - 2.483 GHz,floors,  trees)
transfer  rate  up  to  54  Mbps;
So, if we want to know what would be the
There  are  also  more  standars  in  use:effective range of our network we have to
gather the information mentioned above and
- 802.11f - IAPP - Inter Access Pointcarry out simple calculations showed in the
Protocol - for cooperation between accessfurther part of this self-help book.



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