Modem User Manual

MTX-H15 UMTS-HSDPA terminal modem http://www.matrix.es
MTX-H15 User Manual V.2.0 Pag. 23
Preliminary. Subject to change without prior notice
7. INSTALLATION OF THE MODEM
This chapter gives you advice and helpful hints on how to integrate the MTX-H15 Terminal into your
application from a hardware perspective.
7.1 Where to install the modem
There are several conditions which need to be taken into consideration when designing your application as
they might affect the modem and its function. They are:
7.1.1 Environmental conditions
The modem must be installed so that the environmental conditions stated in the Technical Data chapter,
such as temperature, humidity and vibration are satisfied.
Additionally, the electrical specifications in the Technical Data section must not be exceeded.
7.1.2 Signal strength
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. Degradation in signal strength can be the result of a disturbance from another
source, for example an electronic device in the immediate vicinity. More information about possible
communication disturbances can be found in section 7.3.5.
When an application is completed, you can verify signal strength by issuing the AT command AT+CSQ.
See “AT+CSQ Signal Strength”.
Tip! Before installing the modem, use an ordinary mobile telephone to check a possible location for it. In
determining the location for the modem and antenna, you should consider signal strength as well as cable
length.
7.1.3 Connections of components to MTX-H15 Terminal
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.
7.1.4 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
7.2 How to install the modem
7.2.1 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.