COURIER HIGH SPEED MODEMS
Modulation/Connection Rate (Bn, &Nn)
Use the following guidelines for your Courier type. V.Fast Class does not support synchronous mode.
V.32 terbo modems
If the modem is connecting with another U.S. Robotics V.32 terbo modem, set both modems to B0 and to a variable connection rate, &N0. The modems will connect at the highest possible rate.
If the Courier V.32 terbo is to connect with a V.32 modem, set the Courier to B0 and try a variable connection rate first, &N0. If that doesn't work, try a fixed connection rate of &N6 (9600 bps) or &N3 (2400 bps).
Modems in HST mode
HST modulation for synchronous communications is not supported.
Dual Standard modems
Set the Dual Standard modem to B0. Try a variable connection rate setting (&N0) first. If that doesn't work, you may have to set a fixed connection rate, for example, &N6 (9600 bps).
NOTE: If your modem is set to a fixed rate, and the remote modem is not set to the same rate, your modem hangs up.
Connection Rate (&Nn)
Use this command to set variable or fixed rates at the link interface. The default is &N0, variable rate. The Courier negotiates with the remote modem for the highest possible connection rate, depending on the capabilities of the remote modem. If &N0 does not work, try a fixed rate.
NOTE: The modem is not capable of connecting at 21.6K bps in synchronous mode.
When you set the modem to a fixed rate, it will only connect if the remote modem is operating at the same rate. If not, your modem hangs up.
Synchronous Operations
