User`s manual

U.S. Robotics I-modem Command Reference
Controlling Data Rates • Page 7-3
To implement this feature, Þrst set your software to the desired rate. Then
send the AT&B2&W command.
I-modems store the rate of the command in NVRAM
along with the set-
tings. The I-modem checks NVRAM for the speciÞed serial port rate each
time it makes an ARQ connection.
When sending subsequent conÞgurations to NVRAM, be sure your soft-
ware is set to your selected serial port rate so the correct rate is maintained.
Connection Rates
The I-modem can be set to a Þxed or variable connection rate for analog calls. Set a vari-
able rate to have each I-modem negotiate with the remote device for the highest possible
connection rate. Set a Þxed rate to connect only at a speciÞed rate. You might use a Þxed
rate to Þlter calls for security or other reasons.
Note The connection rate must always be lower than or equal to the serial port
rate.
&Nn Connection rate for analog calls: variable or Þxed.