CEP AG
Revision 1.2
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Page 18 of 28
5.1 Where to install the modem
There are several conditions which need to be taken into consideration when
designing your application as they might affect the modem and its function. They are:
5.1.1 Environmental conditions
The modem must be installed so that the environmental conditions stated in the
Technical Data chapter, such as temperature, humidity and vibration are satisfied.
Additionally, the electrical specifications in the Technical Data section must not be
exceeded.
5.1.2 GSM Signal strength
The modem has to be placed in a way that ensures sufficient GSM signal strength.
To improve signal strength, the antenna can be moved to another position. Signal
strength may depend on how close the modem is to a radio base station. You must
ensure that the location, at which you intend to use the modem, is within the network
coverage area. Degradation in signal strength can be the result of a disturbance from
another source, for example an electronic device in the immediate vicinity. More
information about possible communication disturbances can be found in section 5.3.5.
When an application is completed, you can verify signal strength by issuing the AT
command AT+CSQ. See “AT+CSQ Signal Strength”.
Tip!
Before installing the modem, use an ordinary mobile telephone to check a
possible location for it. In determining the location for the modem and antenna, you
should consider signal strength as well as cable length
5.1.3 Connections of components to GT864-QUAD/PY Terminal
The integrator is responsible for the final integrated system. Incorrectly designed or
installed, external components may cause radiation limits to be exceeded. For
instance, improperly made connections or improperly installed antennas can disturb
the network and lead to malfunctions in the modem or equipment.
5.1.4 Network and Subscription
Before your application is used, you must ensure that your chosen network provides
the necessary telecommunication services. Contact your service provider to obtain
the necessary information.
If you intend to use SMS in the application, ensure this is included in your
(voice) subscription.
Consider the choice of the supplementary services
