User's Manual

GM28 INTEGRATOR’S MANUAL
40
LZT 123 7468 P1A
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.
Signal Strength
The modem has to be placed in a way that ensures sufficient 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 4.3.5, page 43.
When an application is completed, you can verify signal strength by
issuing the AT command AT+CSQ. See “AT+CSQ Signal Strength”,
page 87.
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
Connection of Components to GM28
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.
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 described in
section “2.4.2 Short Message Service”, page 17.
• Please be aware that compliance with AMR may be required by
certain network operators.