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Modem Connection

Guidance to verify the physical connections and virtual interfaces of the mobile modem device.

Physical Connections

Use the included tool hex wrench to lose all of the four pieces of hexagon bolts on the front side of the 4G router, then open the case. You can find the Mobile Modem in the top left corner of the image below.

The Quectel mobile modem has three IPEX connectors, including. Main, GNSS, and DIV. The Main The connector goes to the primary mobile antenna on the top left side, and the connector goes to the alternative mobile antenna on the top right. Both of them use thinner jumper cables compared with the Wi-Fi antenna cables.

‌ To ensure the mobile modem is installed correctly, check the below subjects:

  • Check if the above Main & Div sockets connect to the correct mobile antennas.

  • Check if the attached jumper cables connect tightly.

  • Check if the two pieces screws nearby the jumper cable are installed correctly.

  • Touch the top cover on the mobile modem and test if the temperature is too hot.

*GNSS The socket is for connecting to a GPS antenna. *On Sierra Wireless modems, the alternative mobile socket is AUX, and the GPS antenna socket is GPS

To avoid distorting or breaking the IPEX connectors on the mobile modem, do not reconnect the jumper cables unless the router is malfunctioning.

Virtual Interfaces

When the mobile modem is correctly installed and the router is powered on, go to the command-line interface to check the virtual interfaces created by the mobile modem. The Mobile interface uses one of the virtual interfaces to set up the internet connection.

After accessing the command-line interface, use the command ls /dev to check all the virtual interfaces on the EZR23 router. Check the return value and find if the router has two interfaces below. If unable to locate these interfaces, recheck the above 6.2.1 physical connections.

  • cdc-wdm0: Use by the QMI-cellular protocol

  • ttyUSB2: Use by the 4G-PPP protocol

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