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COURIER HIGH SPEED MODEMS
Synchronous Operations F-5
Offline Host/Modem Clock Speed
The second phase involves the data rate between the host
computer or terminal and its modem during offline mode. The
%N command is used to set the clock speed between the
modem and host, but this speed is only during offline mode,
before the synchronous connection is made.
The %Nn command works in conjunction with &Xn. If the
modem is set so that it is the source of the Transmit clock timing
signals (&X0default), the %Nn commands set the computer or
terminal-to-modem V.25 bis clock speed. If the modem is set to
&X1, the computer is the source of the Transmit clock signals.
If %Nn is set to 0 or 1, you will receive an error message, since
they are not valid values. The %Nn rates are as follows:
%N0 Reserved %N6 9600 bps (default)
%N1 Reserved %N7 12.K bps
%N2 1200 bps %N8 14.4K bps
%N3 2400 bps %N9 16.8K bps
%N4 4800 bps %N10 19.2K bps
%N5 7200 bps
Online Connection Rate
The &N command sets the data rate during the synchronous
connection.
If &Nn is set for 2−10, the modem ignores the %Nn rate and
follows the &Nn rate to set the Online connection rate. The
&Nn rates are as follows:
&N0 Variable (default) &N6 9600 bps
&N1 Reserved &N7 12K bps
&N2 1200 bps &N8 14.4K bps
&N3 2400 bps &N9 16.8K bps
&N4 4800 bps (terbo−to−terbo only)
&N5 7200 bps &N10 19.2K bps
(terbo−to−terbo only)