Sony Ericsson TT4031 (SE-GM29) - Manual (Page 43)

Owner’s Manual Rev 1.0 Page 43 of 43
5.1.3 Connection of Components to TT4031 (SE-GM29).
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
modem or equipment.
5.1.4 Network and Subscription
Before your application is used, you must ensure that your
chosen network provides the necessary telecommunication
services. Contact your service provider to obtain the necessary
information.
If you intend to use SMS in the application, ensure this is
included in your (voice) subscription.
Consider the choice of the supplementary services described in
section “Short Message Service”.
5.2 How to Install the Modem
5.2.1 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.
When the unit is powered from a battery or a high current supply,
connect a fast 1.25A fuse in line with the positive supply. This
protects the power cabling and modem.
5.2.2 Securing the modem
Before securing the modem take into account the amount of
additional space required for the mating connectors and cables that
will be used in the application.
Where access is restricted, it may be easier to connect all the cables
to the modem prior to securing it in the application.
Securely attach the TT4031 (SE-GM29) modem to the host
application using two 3 mm diameter pan-head screws of
appropriate length as shown below.