Wireless LAN – WLAN
BAT54-Rail/F..
Release
7.54
06/08
3.1
What is a Wireless LAN?
25
The operation of the integrated wireless card of your base station is only pos-
sible in one single frequency band, that is, either 2,4 GHz or 5 GHz. Thus a
simultaneous operation of IEEE 802.11g and IEEE 802.11a is not possible.
Since IEEE 802.11g is downward-compatible to IEEE 802.11b, an simulta-
neous operating of these two standards is possible, but with certain speed
constraints.
Note: Please notice that not all frequencies are permitted in each country!
You will find a table with the allotted frequencies and the permission reg-
ulations in the appendix.
3.1.2 Operation modes of Wireless LANs and base
stations
Wireless LAN technology and base stations in Wireless LANs are used in the
following operation modes:
U Transfer rates in
compatibility mode
Please notice that the reached
data transfer rates depend on
the used 2,4 GHz mode. You
will achieve the highest trans-
fer rates with a base station
operating in the 802.11g
mode. The transfer rate will go
down when starting the com-
patibility mode, even, if only
inactivated 802.11b stations
are near to your base station.
When these 802.11b stations
start to be activated in a wire-
less network with operating
compatibility mode, the actual
transfer rate will fall again.
That’s why you should only
activate the compatibility
mode, when you have really
operating 802.11b and
802.11g stations in your wire-
less network.
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