Sony 2140847 User Manual

Page of 63
Rev 3.0D  May.10
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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.