VoxiPlus
Advanced
INSTALLATION MANUAL
© 2008 TOPEX S.A.
page
27
FXO connection – the MPAI card must be
equipped with FXO port (SLIC)
FXS connection – the MPAI card must be equipped
with FXS port (SLIC)
Figure 19 – FXS/FXO connection
3.4
Connecting the antennas
Depending on the device type, TOPEX VoxiPLUS has either one or several connectors for
antenna(s). You should pick the type of antenna that is best for your current location (depending on
the installation site, the current field strength, frequencies used by the mobile carriers you want to
connect to etc.).
Mounting the antenna
To ensure a good quality of transmission and reduce radio interference, use the antenna(s)
shipped in the BYTTON package. During installation, care must be taken that the antenna base
(usually the mounting bracket) is grounded. Grounding of the antenna base improves reception of the
mobile networks.
At the same time, a grounded antenna is indirectly protected from the effects of lightning.
Lightning which strikes in the vicinity could otherwise induce very high voltages in the antenna that
would destroy the equipment.
When the mobile antenna is mounted directly on a roof, then it is exposed to nearby lightning
strikes so a surge protector must be installed. If your site has low level of 3G signal, it may not be
possible to use the full 2G / 3G technology without a special, high gain antenna.
You should get such an antenna and install it in a higher position (the roof of the building),
directed towards the base station of the mobile network carrier, in order to get best results. You can
determine the current field strength at the installation site using the configuration software provided
for TOPEX VoxiPLUS.
