USB Modems for Dial Backup

You can configure your device to “fail over” to a USB modem connection when the primary Internet connection experiences interruption.

Note: Low-latency traffic such as VoIP traffic is not supported over USB modem connections.

Note: We recommend using a US Robotics USB 56k V.92 Modem, model number USR Model 5637.

For information about which devices support the features documented in this chapter, see the Junos OS Feature Support Reference for SRX Series and J Series Devices.

This chapter includes the following topics:

• USB Modem Terms
• USB Modem Interface Overview
• Before You Begin
• Connecting the USB Modem to the Device's USB Port
• Configuring USB Modems for Dial Backup with a Configuration Editor