SoundExpression SE14SRS, Руководство пользователя

Страница: 58 / 72

58
SoundExpression
Subparameter Definitions
1. <mod> = a decimal number which
specifies the preferred modulation
(automode enabled) or the modulation
(automode disabled) to use in
originating or answering a connection.
The options are as shown below:
Modulation
<mod> Selected Possible rates (bps)
0 V.21 300
1 V.22 1200
2 V.22bis 2400 or 1200
3 V.23 1200*
9 V.32 9600 or 4800
10 V.32bis 14400, 12000, 9600, 7200,
or
4800
11 V.34 28800, 26400, 24000,
21600, 19200, 16800,
14400, 12000, 9600, 7200,
4800, or 2400 (default)
64 Bell 103 300
69 Bell 212 1200
74 V.FC 28800, 26400, 24000,
21600, 19200, 16800,
14400
* For V.23, originating modes transmit at
75bps and receive at 1200bps; answering
modes transmit at 1200bps and receive at
75bps. The rate is always specified at
1200bps.
The modem may also automatically
switch to another modulation
(automode), subject to the following
constraints:
• The modem may not be able to
automatically switch from the current
modulation (specified by <mod>) to
some other modulation. For example,
there is no standard way to automode
from Bell 103 to V.23.
• The DTE may disable automode
operation (see <automode>).
• The DTE may constrain the range of
modulations available by specifying the
lowest and highest rates (see <min_rate>
and <max_rate> below).
2. <automode>=an optional numeric
value which enables or disables
automatic modulation negotiation.
Options are:
<automode> Option Selected
0 Automode disabled
1 Automode enabled
The default value is 1, which enables
automode. Note, however, there are
modulations for which there is no
automatic negotiation (e.g., Bell 212
(<mod>=69).
For <automode> = 0 (automode
disabled, i.e., fixed modulation):
a. If <max_rate> is within the rates
supported by the selected modulation,
the selected rate is that specified by
<max_rate>.