Before installing the wireless modem, use an ordinary mobile

telephone to check a possible location for it. In determining the

location for the radio device and antenna, you should consider signal

TIP strength as well as cable length.

7.4.1.3 Connection of Components to Wireless modem

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 wireless modem or equipment.

7.4.1.4 Network and Subscription

Before the integrator’s application is used, the user must ensure that their chosen network provides the necessary telecommunication services. Integrators should contact their service provider to obtain the necessary information.

Integrators intending to use SMS in the application should ensure this is included in their (voice) subscription.

Similarly, integrators intending to use GPRS for data services should also ensure that this service is available on their network and in their account plan.

Users should consider the choice of the supplementary services described in section

2.3.2Short Message Service, on page 14.

7.4.2How to Install the Wireless modem

7.4.2.1 Power Supply

Use a high-quality power supply cable with low resistance. This ensures that the voltages at the connector pins are within the allowed range, even during the maximum peak current. An electrolytic capacitor should be placed close to the power supply pins of the wireless modem to supply the peak currents during burst transmission. See 5.5 Regulated Power Supply Input (VCC), page 38.

7.4.2.2 Grounds

A ground connection is provided at the mounting hole next to the RF connector on the wireless modem (see Figure 5.1, page 19). Connect this ground point to the GND pins of the wireless modem by the shortest, low impedance path possible. The purpose of this connection is to allow any ESD picked up by the antenna to bypass the wireless modem’s internal ground path.

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