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6177-2203
%En – Enable/Disable Line Quality Monitor and Auto-
Retrain or Fallback/Fall Forward (V.22bis only)
Controls whether or not the modem will automatically monitor the line quality and request a retrain
(%E1) or fall back when line quality is insufficient or fall forward when line quality is sufficient
(%E2). The parameter value, if valid, is written to S41 bits 2 and 6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
%E0
Disable line quality monitor and auto-retrain.
%E1
Enable line quality monitor and auto-retrain (default).
Please also refer to ATO
*E – Exit Remote configuration mode
Upon receipt of this command from the telephone line, the modem will exit remote configuration
mode and transmit the OK result code to the line.Please also refer to S202.
Fn – Select Line Modulation
This command selects the line modulation according to the parameter supplied. The line modulation
is fixed unless Automode is selected. This command interacts with the S37 and the N command. The
parameter value, if valid, is written to S37 bits 0-4. To select line modulation it is recommended that
either the F command, or a combination of the S37 and the N command are used but not both.
F0
Selects auto-detect mode. Sets N1 and sets S31 bit 1. In this mode, the modem
configures for Automode operation. All connect speeds supported by the modem are
possible according to the remote modem's preference. The contents of S37 are ignored
as is the sensed DTE speed.
F1
Selects V.21 or Bell 103 according to the B setting as the only acceptable line speed
resulting in a subsequent connection. Sets N0, sets S37 to 1, and clears S31 bit 1.
This command is equivalent to the command string: ATN0S37=1.
F2
Not supported.
F3
Selects V.23 as the only acceptable line modulation for a subsequent connection.
Originator is at 75 bps and answer is at 1200 bps. Sets N0, sets S37 to 7, and clears
S31 bit 1. This command is equivalent to the command string: ATN0S37=7.
F4
Selects V.22 1200 or Bell 212A according to the B command setting as the only
acceptable line speed for a subsequent connection. Sets N0, sets S37 to 5, and clears
S31 bit 1. This command is equivalent to the command string: ATN0S37=5.
F5
Selects V.22 bis as the only acceptable line modulation for a subsequent connection.
Sets N0, sets S37 to 6, and clears S31 bit 1. This command is equivalent to the
command string: ATN0S37=6.
Please also refer to ATN, ATB, S37
&F – Recall (restore) factory configuration
This command restores the original factory setting of all parameters. The factory defaults are
identified for each command and in the S-register descriptions. When the modem is restarted the
parameters set by the customer will be restored. By using the &W command the factory settings will
be valid also after restart of the modem.
Summary of Contents for TD-22 AC
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