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LANCOM L-32x Access Point series
Chapter 7: Options and accessories
83
EN
7.1 Optional AirLancer Extender antennas
AirLancer Extender antennas are capable of extending the operating range of
the devices, or of adapting access point coverage to local conditions. An over-
view of the supported antennas is available from the LANCOM Web site under
www.lancom.eu
.
You will also find further information on calculating the best configu-
ration for AirLancer Extender antennas and third-party antennas that
you wish to connect to the device in the LANCOM Antenna Calculator,
which can be downloaded from our Web site at www.lancom.eu
.
When assembling separately purchased mobile radio antennas please
note that the maximum allowed transmission power of the wireless
LAN according to EIRP in the country in question may not be excee-
ded. The system operator is responsible for adhering to the threshold
values.
For internal lightning protection, the surge adapter AirLancer
Extender SA-5L is always necessary—the AirLancer Extender SA-5L
is mounted between the Access Point and the antenna, as close to the
antenna as is possible.
Antennas are only to be attached or changed when the device is swit-
ched off. Mounting or demounting antennas while the device swit-
ched on may cause the destruction of the WLAN module!
7.1.1 Antenna diversity
The transmission of radio signals can suffer from significant signal losses
because of reflection and scatter, among other reasons. In some areas, the
interaction with the reflected radio waves can cause a drop in signal strength,
or even cause it to be cancelled out completely. Transmission quality can be
improved with so-called "diversity" methods. The principle of "diversity"
methods relies on the fact that a transmitted signal is often received multiple
times (generally twice).
Each wireless LAN module is equipped with two send/receive units, each of
which can be connected to an antenna. In the case of antenna diversity, the
WLAN module checks which send/receive unit (antenna) is receiving the
strongest signal from a client. Only the stonger signal is used. The Access
Point stores the information on which send/receive unit was used to receive
84


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