Sierra Raven EDGE - Manual (Page 134)

Windows Dial-up Networking (DUN)
Rev 3.0B Feb.08 130
c. Check Show icon...when connected.
d. Select Configure, below the Connect using line.
Figure 3-23: DUN Properties
e. Select 115200 as the Maximum speed.
f. Check Enable hardware flow control.
g. Do not check any other option.
h. Select OK.