
Command Reference Manual
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3.2.1.5 -SMS= - Select Mode
Selects Data mode, AudioSpan (analog simultaneous voice and data), or DSVD (digital simultaneous voice and data) or
enables automatic mode selection. The x parameter selects the mode.
Syntax
-SMS<mode>
Defined Values
<mode>
Decimal number corresponding to the selected mode or automatic mode select enable.
0
Data mode (Default)
1
DSVD mode (a modem not supporting DSVD will respond with ERROR)
2
AudioSpan mode (a modem not supporting AudioSpan will respond with ERROR)
3
Automatic mode select (DSVD/AudioSpan/Data)
Notes
AudioSpan and DSVD are two technologies that allow simultaneous voice and data operation using a Rockwell modem
connected to a telephone line. AudioSpan and DSVD implementations differ in the manner that voice and modem data are
combined. Voice and data channels are combined in the analog domain for AudioSpan and in the digital domain for DSVD.
Establishing a AudioSpan or DSVD connection is analogous to establishing a regular data modem connection. Initiate the call
using normal dialing (ATD) and answering (ATA) procedures. The modem can switch from a regular phone conversation into
AudioSpan or DSVD mode and back to phone conversation. A handset, headset, or microphone/speaker can be used for
voice communication during AudioSpan or DSVD mode.
AudioSpan operates in normal (non-error corrected) or error-corrected/compression mode (MNP 5 or V.42 bis depending on
the error correction settings of the modems). The DTE rate must be equal to or greater than the anticipated DCE connection
speed. In general, DTE speed of 38400 bps or higher should be used.
DSVD requires a V.34 mode connection.
AudioSpan audio quality is dependent upon telephone line quality. Higher quality telephone lines provide better audio quality
than impaired telephone lines.
Reporting Selected Options
The modem reports the selected options in response to the following command:
-SMS?
The response is:
<mode>
Example:
-SMS?
1
Reporting Supported Options
The modem reports the supported options in response to the following command:
-SMS=?
The response is:
(list of<mode> values)
Example:
-SMS=?
(0,1,2,3)
Summary of Contents for RC336D
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