NetModule NB3711, Руководство пользователя

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NB3711 User Manual 4.0
into place. To remove the SIM, you will need to push it again in the same manner. The
SIM card will then rebounce and can be pulled out.
SIMs can be assigned flexibly to any modem in the system. It is also possible to switch
a SIM to a different modem during operation, for instance if you want to use another
provider upon a certain condition. However, a SIM switch usually takes about 10-20
seconds which can be bypassed (e.g. at bootup) if SIMs are installed reasonably. Using
only a single SIM with one modem, it should be preferably placed into the SIM 1 holder.
For systems which should operate two modems with two SIMs in parallel, we recommend
to assign
Mobile 1 to SIM 1 and Mobile 2 to SIM 2.
Further information about SIM configuration can be found in chapter 5.3.3 .
4.4. Installation of the GSM/UMTS/LTE Antenna
NetModule routers will only operate efficiently in the cellular network if there is a good
signal. A stub antenna will be suitable for most applications. However, in some circum-
stances it might be necessary to use remote antennas together with an extended cable
to reach a better location offering an adequate signal. In doubt, please contact us and
we would be pleased to assist you in figuring out the best matching antenna setup for
your application.
Keep in mind that effects caused by Faraday cages such as large metal surfaces (elevators,
machine housings, etc.), close meshed iron constructions and others may reduce signal
reception significantly.
The antenna or antenna cable has to be mounted to the Mobile 1 connector and should
be fixed with a wrench. The antenna for the second modem (if present) should be
connected to
Mobile 2
.
4.5. Installation of the WLAN Antennas
Any WLAN antennas must be mounted to the connectors WLAN1 and WLAN2 . The
number of attached antennas can be configured in the software. If only one antenna is
used, it must be attached to
WLAN1 . However, for better diversity and thus better
throughput and coverage, we highly recommend using two antennas.
4.6. Installation of the GPS Antenna
The GNSS antenna must be mounted to the connector GPS . Whether the antenna is
an active or passive GPS antenna has to be configured in the software. We recommend
active GPS antennas for highly accurate GPS tracking.
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