Black Box MD1276A, User Manual

Page: 170 / 289

Page 170
AT\N Asynchronous Operating Mode
The \N command allows you to select any of your modem
’ s four asynchronous operating
modes. AT\N0 selects constant speed mode, enabling the modem to use different terminal and
line speeds.
Your modem supports constant terminal speeds from 300 bps to 460,400 bps. For example,
with constant speed selected the modem could connect with a remote system using V.22 (1200
bps) while communicating with your computer at 115,200 bps. Selecting constant speed mode
also means the modem will not modify its terminal speed when answering incoming calls.
+ It is necessary to select flow control (&K command) between the modem and your
computer when you use constant speed mode.
AT\N1 selects variable speed mode. With variable speed mode selected, the modem adjusts its
terminal speed to match line speed. If the terminal speed is higher than the modem
’ s maximum
line speed, the modem will attempt to connect using its highest speed.
+ Flow control will be ignored when your modem is configured for variable speed
mode or is in local command state. Flow control is only available when the
modem is configured for constant speed mode or reliable or auto-reliable modes
and is operating in on-line state.
When answering, the modem automatically adjusts its terminal speed to match the standard used
by the calling modem.
+ With variable speed mode selected, your modem
’
s terminal speed should not be
changed once connected to another modem.
Changes to \N when on-line will not take effect until the next connection.
Options
AT\N0 Constant speed mode
AT\N1 Variable speed mode
AT\N2 MNP Reliable mode
AT\N3 n V.42/MNP auto-reliable mode
AT\N4 V.42 reliable mode
AT\N5 V.42 auto-reliable mode
AT\N6 V.42/MNP reliable mode with fallback to MNP reliable mode, disconnect if
MNP not supported by remote modem.
AT\N7 MNP auto-reliable mode