Using cellular modems in a Wireless WAN (WWAN)

The TX64 supports two cellular modems, named WWAN1 cellular modem and WWAN2 cellular modem, which are included in two preconfigured Wireless WANs, WWAN1 and WWAN2.

Each 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 TX64 device cannot connect to the network using SIM1, it automatically fails over to SIM2. TX64 devices automatically use the correct cellular module firmware for each carrier when switching SIMs.

Because the TX64 device has two cellular modems, it 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.