COURIER HIGH SPEED MODEMS
&M1 This setting is exclusive of the modems' error control and is used only for online synchronous mode without V.25 bis. See Appendix F for more information.
&M2 Reserved.
&M3 Reserved.
&M4 Normal/ARQ mode. Default. If an ARQ connection isn't made, the modem operates in Normal mode, as though it were set to &M0.
&M5 The modem enters ARQ asynchronous mode. The modem hangs up if an ARQ connection cannot be made.
&M6 The modem enters V.25 bis synchronous mode, using a
&M7 The modem enters V.25 bis synchronous mode, using the HDLC link protocol.
&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.
