4000 Router Series Layer 2 - WAN Configuration Guide

Configuring a 3G modem

3G modem modules include USB 3G modem modules and SIC-3G modem modules.

• A USB 3G modem module is hot swappable. It is managed in cellular interface view, which is still

accessible without a USB 3G modem installed. Configuration for a USB 3G modem in cellular

interface view can still be saved after the USB 3G modem is removed.

• A SIC-3G modem module is not hot swappable. When a SIC-3G modem is installed, the system

dynamically creates a cellular interface to manage the SIC-3G modem based on the slot where the

modem is inserted. When the SIC-3G modem is removed, the system dynamically removes this

cellular interface.

A serial interface channelized from a cellular interface operates in protocol mode, with the link layer

protocol PPP and the network layer protocol IP.

Configuration restrictions and guidelines

• Do not remove a USB 3G modem when it is transmitting data. Execute the shutdown command to

shut down the USB 3G modem before removing it.

• A USB 3G modem is not usable when the USB interface to which the modem is attached is shut

down. For more information about shutting down a USB interface, see Fundamentals Configuration

Guide.

• Configure PPP, DDR, IP address, firewall, and backup center on the cellular interface as needed.

• Unless otherwise noted, configurations for a 3G modem in this document are saved in the NVM of

the 3G modem. To examine whether the configurations take effect, execute the display cellular

command.

Configuration task list

Tasks at a

lance

(Optional.) Configuring a cellular interface

(Optional.) Configuring a 3G network

(Optional.) Creating a parameter template

(Optional.) Configuring PIN authentication

(Optional.) Configuring DM

(Optional.) Issuing a configuration directive to a 3G modem

(Optional.) Configuring automatic reboot

(Optional.) Configuring manual reboot