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COURIER HIGH SPEED MODEMS
Alphabetical Command Summary C-13
&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
character-oriented link protocol similar to BISYNC. See
Appendix F for more information.
&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.