2
• A USB 3G/4G 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.
• Unless otherwise noted, the 3G/4G modem configuration in this document is saved in the NVM
of the 3G/4G modem. To verify the configuration, use the display cellular command.
3G/4G modem management tasks at a glance
To management a 3G/4G modem, perform the following tasks:
1. Configuring the 3G/4G modem cellular interface
{ Configuring the 3G modem cellular interface
{ Configuring the 4G modem cellular interface
2. Configuring an Eth-channel interface for a 4G modem
3. Configuring a 3G/4G network
4. Configuring parameter profiles
5. (Optional.) Specifying the primary or secondary SIM card
6. (Optional.) Associating 3G/4G link backup with a track entry
7. (Optional.) Configuring PIN verification
8. (Optional.) Configuring DM
9. (Optional.) Setting the RSSI thresholds
10. (Optional.) Issuing a configuration directive to a 3G/4G modem
11. (Optional.) Configuring 3G/4G modem reboot
{ Configuring automatic reboot
{ Configuring manual reboot
12. Binding the IMSI of the SIM card to an interface
Configuring the 3G modem cellular interface
1. Enter system view.
system-view
2. Enter cellular interface view.
controller cellular cellular-number
3. (Optional.) Configure a description for the cellular interface.
description text
By default, the description for a cellular interface is interface name Interface, for example,
Cellular 2/4/0 Interface.
4. Channelize the cellular interface into a synchronous/asynchronous serial interface.
serial-set set-number
This command names the serial interface as serial cellular-number:set-number.
Configure PPP and DDR, and specify an IP address for the serial interface channelized from
the cellular interface of a 3G modem as needed.
5. Bring up the cellular interface.
undo shutdown
By default, a cellular interface is up.
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