Sony Ericsson GM28, Integrator'S Manual

Page: 41 / 268

5. INSTALLATION OF THE MODEM
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LZT 123 7468 R1A
5. Installation of the Modem
This chapter gives you advice and helpful hints on how to integrate the
GM28 into your application from a hardware perspective.
Please read the information given in “Safety and Product Care”, page
38 and then the read the information in this section before starting your
integration work.
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 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 5.4.5, page 44.
When an application is completed, you can verify signal strength by
issuing the AT command AT+CSQ. See “AT+CSQ Signal Strength”,
page 91.
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