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Interfaces
By default, the WAN/ETH1 Ethernet device is configured as a WAN, named WAN, with both DHCP and
NAT enabled and using the External firewall zone. This means you should be able to connect to the
Internet by connecting the WAN/ETH1 Ethernet port to another device that already has an internet
connection.
The ETH2 device is configured as a LAN interface, named LAN, which uses the Internal firewall zone.
Using cellular modems in a Wireless WAN (WWAN)
The TX40 supports one cellular modem, named WWAN1 cellular modem, which is included in a
preconfigured Wireless WAN, also named WWAN1.
The cellular modem can have only one active SIM slot at any one time. For example, WWAN1 cellular
modem can have either SIM1 or SIM2 up at one time.
Typically, you configure SIM1 of the cellular modem as the primary cellular interface, and SIM2 as the
backup cellular interface. In this way, if the TX40 device cannot connect to the network using SIM1, it
automatically fails over to SIM2. TX40 devices automatically use the correct cellular module firmware
for each carrier when switching SIMs.
Configure cellular modem
Configuring the TX40's cellular modem involves configuring the following items:
Required configuration items
Enable the cellular modem.
n
The cellular modem is enabled by default.
Determine the SIM slot that will be used when connecting to the cellular network.
n
Configure the maximum number of interfaces that can use the modem.
n
Enable carrier switching, which allows the modem to automatically match the carrier for the
n
active SIM.
Carrier switching is enabled by default.
Configure the access technology.
n
Determine which cellular antennas to use.
n
Additional configuration items
n
If Active SIM slot is set to Any, by default the device uses the SIM slot that was last used or
was operational. As an alternative, you can specify a preferred SIM slot.
In the event of a failover to a non-preferred SIM, or if manual SIM switching is used to switch to
a non-preferred SIM, the modem will attempt to reconnect to the SIM in the preferred SIM slot.
5Gsingle slice (NSSAI) support
n
The Digi TX40 cellular modem supports 5Gtechnology. In order to take advantage of the 5G
capabilities of the device, you must use a SIM that has been provisioned for 5Gsupport.
TX40 User Guide
Wide Area Networks (WANs)
118
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