Sony Ericsson Mobile Communications Inc. TR-505-A2 Manuale Utente

DM15/25 Integrator’s Manual

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mode. This means that applications that want to use both modes may choose a different carrier for
NAM-2.  Using different carriers raises some complications with IRDB settings.

.

The DM-15/DM-25 supports Over the Air Programming as defined in EIA/TIA 136 Rev. B

This chapter, which gives you advice and helpful hints on how to integrate the DM-15/DM-25 with
the application, should be taken as a guide.

Note!  The circuits on the test board are not shielded. Thus take proper precautions for avoiding
ESD and EMI.

Here is a list of preparations that you should make before beginning the integration work that is
described in this chapter.

•

Where to install the module.

•

Safety Standards.

•

Network and subscription.

•

Antenna.

Make sure that the module is installed so that the environmental conditions, such as temperature,
humidity, vibration, etc., are not beyond the limits specified for it. See also section 7 Technical
Data.

Make sure that the signal strength is sufficient. To improve signal strength, move the antenna to
another position. Signal strength may depend on how close the module is to a radio base station.
Degradation in signal strength could be a result of disturbance from another source, for example, an
electronic device nearby.

You can verify signal strength by issuing the AT command AT+CSQ.

Tip!  Before installing the module, use an ordinary mobile telephone to check a possible location for
it. Consider signal strength as well as cable length in determining the location for the module and
antenna. That way, you will find out if it is practical to install the module where you intended.