The radio module tries to connect to the 3G Network; if it does not succeed, it tries to connect to the 2G
Network. Differently from the previous command, once the network type has been selected it does not
change until the radio module disconnection.
set gprs no-umts
Only the 2G network will be selected for radio module connection.
set gprs umts-only
Only the 3G network will be selected for radio module connection.
On the routers that have the LTE interface (like Imola 5xxx) you can use the command:
set gprs lte
that enables the modem to work on the LTE network, if available; otherwise the connectivity available in the
network cell (like 3G or 2G).
If you use set gprs lte you can specify other options to select the work frequencies or the radio
technology. In particular the command:
set gprs lte-band <value>
allows to select the working frequency on LTE network (admitted values are b1, b3, b7, b8, b20, b8-
900, b1-2100).
The command:
set gprs selrat <value>
where <value> can be:
2G-Only 3G-Only 2G-3G-Only LTE-Only LTE-Preferred 3G-LTE 2G-3G-LTE auto
allows to specify the radio access technology.
Usually, the value auto is used when you want to empower the modem to auto-select the best radio
technology to use.
If you specify the LTE-Preferred value, the router tries to register on a LTE cell and if the attempt fails, it
will do the Fall-Back over other technologies. In this case, you can use:
set gprs fallback-rat <value>
where <value> can be:
2G-Only 3G-Only 2G-3G-Only auto
In this way you determine which technology the router must use during the Fall-Back operation.
You can use the parameter lte-camping-timer in association to the value LTE-Preferred. Using this
parameter, you can specify an interval in seconds within which it is verified if the modem radio is
connected to a LTE cell. For example, you can use the syntax:
set gprs selrat LTE-Preferred
set gprs selrat lte-camping-timer 3600
Every 3600 seconds the router controls if the modem is connected to a LTE cell and if not, it tries to make
a new registration. You must remember that if the router is located in a 3G cell, the connection is
temporarily disabled.
It is possible to activate (or deactivate) a description of the GPRS interface that will be given back by the
SNMP agent (if configured and activated) by querying the Mib_II ifDescr variable through the following
commands:
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