Chapter 10 Wireless Lan - BinTec RS353j User Manual

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bintec RS Series

Chapter 10 Wireless LAN

In the case of wireless LAN or Wireless LAN (WLAN = Wireless Local Area Network), this
relates to the creation of a network using wireless technology.
Network functions
Like a wired network, a WLAN offers all the main network functions. Access to servers,
files, printers, and the e-mail system is just as reliable as company-wide Internet access.
Because the devices do not require any cables, the great advantage of WLAN is that there
are no building-related restrictions (i.e. the device location does not depend on the position
and number of connections).
Currently applicable standard: IEEE 802.11
In the case of 802.11-WLANs, all the functions of a wired network are possible. WLAN
transmits inside and outside buildings with a maximum of 100 mW.
IEEE 802.11g is currently the most widespread standard for wireless LANs and offers a
maximum data transmission rate of 54 mbps. This procedure operates in the radio fre-
quency range of 2.4 GHz, which ensures that parts of the building are penetrated as effect-
ively as possible with a low transmission power that poses no health risks.
A 802.11g-compatible standard is 802.11b, which operates in the 2.4 GHz range (2400
MHz - 2485 MHz) and offers a maximum data transmission rate of 11 mbps. 802.11b and
802.11g WLAN systems involve no charge or login.
With 802.11a, bandwidths of up to 54 mbps can be used in the 5150 GHz to 5725 MHz
range. With the higher frequency range, 19 non-overlapping frequencies are available (in
Germany). This frequency range can also be used without a licence in Germany. In
Europe, transmission power of not just 30 mW but 1000 mW can be used with 802.11h, but
only if TPC (TX Power Control, method for controlling transmission power in wireless sys-
tems to reduce interferences) and DFS (Dynamic Frequency Selection) are used. The pur-
pose of TPC and DFS is to ensure that satellite connections and radar devices are not in-
terfered with.
The standard 802.11n (Draft 2.0) uses MIMO technology (Multiple Input Multiple Output) for
data transmission that allows data transfer via WLAN over longer distances or with higher
data rates. With a bandwidth of 20 or 40 MHz, a gross data rate of 150 Mbps or 300 Mbps
is achieved.
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