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Rev 3.0D May.10 15
4
4: USB Connection
A single USB modem can be connected to Helix RT. USB modems
Compass 598 (Sprint) and Compass 895 (AT&T) are supported.
Only one cellular device, that is either the Helix RT or the USB
modem operates at a given time. When a USB modem is connected
to the Helix RT, it assumes all the functions of the internal radio
module to provide WWAN connectivity. Once the USB modem is
removed the internal radio module of Helix RT restarts.
Figure 4-1: USB modems : Compass 895 and Compass 598
When a USB modem is connected to the Helix RT, it performs with
the other all the features as if it were the Helix RT. WAN failover, APN
configuration, and similar features now operate with the USB modem.
Multiple failover options include USB modem in WAN failover feature,
so that the software can automatically toggle between:
• WAN port Ethernet connection
• Embedded modem
• USB modem.
Note: Only one external USB modem can be plugged in at a time.