Digi TX54 User Manual page 67

Interfaces
Dual-cellular models:
n
WWAN1 cellular modem
l
WWAN2 cellular modem.
l
These devices are included in one or two preconfigured Wireless WANs, WWAN or WWAN1, and
WWAN2.
Each cellular modem can have only one active interface 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 TX54 device cannot connect to the network using SIM1, it
automatically fails over to SIM2. TX54 devices automatically use the correct cellular module firmware
for each carrier when switching SIMs.
The dual-cellular variants of the TX54 device can have two cellular interfaces up at one time—one for
each modem. Typically, an administrator would route traffic to different destinations over a specific
cellular interface.
Configure cellular modem APNs
The TX54 device uses a preconfigured list of Access Point Names (APNs) when attempting to connect
to a cellular carrier for the first time. After the device has successfully connected, it will remember the
correct APN. As a result, it is generally not necessary to configure APNs. However, you can configure
the system to use a specified APN.
To configure the APN:

WebUI
1. Log into the TX54 WebUI as a user with full Admin access rights.
2. On the menu, click System. Under Configuration, click Device Configuration.
The Configuration window is displayed.
3. For single-cellular models, click Network > Interfaces > WWAN or WWAN1 > APN list.
TX54 User Guide
Wide Area Networks (WANs)
67