User Manual

USING MODEM STATION
87
• Symbol Rate displays the speed of the
transmission.
• Trellis Code, Nonlinear Encoding,
Shaping, and Precoding all refer to
methods of handling high speed data
transmission.
• The items followed by (dB), (-dB), (-dBm),
and (msec) refer to variations in the
modulation tones that actually carry the
information.
The rest of the screen contains information
about CRC errors, Block Errors (Blers),
resent data, and other data. This information is
very important if you experience problems
transmitting or receiving data or if you suspect
problems with your phone service.
If you are having connection problems, go
directly to this screen to get this information. If
you save anything to the modem between the
last connection and this screen, the modem will
not save these settings.
Only our U.S. Robotics Winmodems use
VxDs, or Virtual Device Drivers. The
Winmodem uses special software (called a
‘driver’) to manage many of the functions
handled by hardware in our other modems. If
you are using a Winmodem, the Extended
Information menu will offer you the option of
clicking on VxD to view information on the
Winmodem driver. Please refer to your
Winmodem manual for detailed information on
the Winmodem drivers.
Courier users will see a display of current
Dialback/Security settings. Refer to your
Courier documentation for instructions on
configuring these special features.