Multi-Tech Systems 92U03G23710 User Manual

Chapter 6 – Application Considerations

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Ground plane: Multi-Tech recommends having a common ground plane for analog, digital, and
RF grounds

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ESD protection on serial link.

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Possible spurious emission radiated by the application to the RF receiver in the receiver band

The antenna sub-system and integration in the application is a major issue. It is a major issue in the
choice of the antenna cable (type, length, performances, thermal resistance, etc.)

These elements could affect GSM performances such as sensitivity and emitted power.

The antenna should be isolated as much as possible from the digital circuitry including the interface
signals.

Multi-Tech recommends shielding the terminal. On terminals including the antenna, a poor shielding could
dramatically affect the sensitivity of the terminal. Subsequently, the power emitted through the antenna
could affect the application.

The pins of the SocketModem may be hand soldered or wave soldered. If wave soldered, the temperature
on the top of the SocketModem must not exceed 100° C.

There should be no solvent or water washing of the SocketModem.

Do not use a hot air gun on the SocketModem.

The SocketModem firmware is stored in flash memory, and it can easily be upgraded. Contact the factory
for details.

For initial configuration of your wireless device, Multi-Tech offers a Windows-based mobile PhoneTools
application.

To load Mobile PhoneTools, click the Mobile PhoneTools icon on the system CD and follow the on-screen
prompts.