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12.3 Cellular Modem
Problem in signal strength
Figure 16: Cell Modem Card Location
Figure 17: Line Modem Card Location
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.
• Reboot through unplugging the power.
1. If signal does not improve, insert the SIM card into a cell phone and check the signal (GSM
only).
2. If the signal is weak, check with your service provider.
3. If the signal is OK, change the module.
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