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LANCOM OAP-54-1 Wireless – LANCOM OAC-54-1 Wireless
Chapter 7: Options and accessories
7.1.1
Antenna Diversity
LANCOM OAP-54-1
The transmission of radio signals can suffer from significant signal losses
Wireless only
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). With appropriate processing,
these signals can be re-combined into a single signal. The most common
methods are space diversity and polarization diversity.
LANCOM Systems supplies a variety of polarization-diversity antennas as
accessories for LANCOM Access Points and LANCOM Wireless Routers. These
models enable two orthogonally polarized signals to be received with a single
antenna. Further information about this technique is available in our "Polari-
zation Diversity" techpaper.
7.1.2
Installation of AirLancer Extender antennas
Polarization diversity antennas from LANCOM Systems:
LANCOM OAP-54-1
The integrated antennas of the LANCOM OAP-54-1 Wireless are best-suited
Wireless
for establishing point-to-point connections. When using the device in access
point mode, for getting more antenna gain or to use the diversity function it
is recommended to apply external antennas.
To install the provided omni-directional antenna or optional AirLancer Exten-
der antennas, switch the device off by disconnecting the PoE supply. Carefully
unscrew the terminators. Connect the antenna to the appropriate 'Antenna
Main' connector. When connecting the external antenna to the Main connec-
tor, the internal antenna is automatically deactivated.
68
AirLancer Extender O-D80g (2.4 GHz band ), item no. 61221
AirLancer Extender O-D60a (5 GHz band ), item no. 61222
AirLancer Extender O-D9a (5 GHz), item no. 61224
Before mounting external antennas, please observe the information
on lightning protection in the LANCOM Outdoor Wireless Guide (avai-
lable as a download from www.lancom.eu). Mounting antennas wit-
hout adequate lightning protection could lead to serious damage to
the access point and the network infrastructure connected to it.
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