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COURIER HIGH SPEED MODEMS
4-22 Data Mode Operations
&B2 Fixed for ARQ calls/Variable for non-ARQ calls. Answer
mode only. When the modem goes off hook and
connects in ARQ mode, it shifts its serial port rate up to a
user-specified rate, for example, 38.4K bps. If the
connection is not under error control, the modem
behaves as if it were set to &B0 and switches its serial
port rate to match the connection rate of each call.
To implement this feature, first set your software to the
desired rate. Then send the modem the AT &B2 [other
settings] &W command.
The modem stores the rate of the command in NVRAM
along with the settings. Each time it makes an ARQ
connection, the modem checks NVRAM for the specified
serial port rate.
When sending subsequent configurations to NVRAM, be
sure your software is set to your selected serial port rate,
so that the correct rate is maintained.
&Nn Connection rate variable or fixed.
&N0 Variable rates. Default. The Courier negotiates with the
remote modem for the highest possible connection rate,
depending on the capabilities of the remote modem. This
is the recommended setting, and is required for the
Courier V.32 terbo to connect at 21.6K bps. Both modems
must be U.S. Robotics modems with V.32 terbo to make a
21.6K bps connection.
&N1- Fixed rate. The modem only connects if the remote
&N14 modem is operating at the same rate. If not, the modem
hangs up. If you wish, you can filter out calls at other
than a specific rate, for security or other reasons, by
fixing the connection rate.
The connection rate must always be lower than, or equal
to, the serial port rate, never higher.