MT5634ZBA-GLOBAL Multi-Tech Systems, MT5634ZBA-GLOBAL Datasheet - Page 51

• Manufacturer Part Number: MT5634ZBA-GLOBAL
• Description: MODEM V.90 DATA/FAX GLOBAL
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® ZBAr

Specifications of MT5634ZBA-GLOBAL

• Data Format: V.90
• Mounting Type: Desktop
• Package / Case: 5.7" L x 4.3" W x 1.0" H (145mm x 109mm x 25mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Interface: -
• Other names: 881-1149; MT5634ZBA-GLOBAL

+VSD
Description:
Syntax:
Values:
Result Codes:
Reports:
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
Silence Detection Sensitivity
Sets the silence detection sensitivity and the required period of silence before the
modem reports silence detected at the end of a voice receive, either with the
Presumed End of Message (Quiet) or Presumed Hang Up (Silence) event reports.
The table below outlines the possible combinations of the +VSD and +VSM
commands using the <sds> parameter. An <sdi> parameter value of 0 means that
long-term silence detection is disabled. (Note that long-term silence detection refers
to the use of this function to detect the end of a voice receive (i.e., the user stops
talking).
The parameter <sds> is used by the PC to select greater amounts of modem silence
detection activity; larger values imply that the PC wants the modem to treat noisier
conditions as silence. The value entered for <sds> has no actual unit of measure.
The modem may limit silence detection sensitivity to a more narrow range (e.g., from
120 to 136). A setting of 0 has no meaning.
The parameter <sdi> sets the required period of silence before the modem can report
silence detected either with the Presumed End of Message (Quiet) or Presumed
Hang Up (Silence) event reports. A value of 0 disables modem silence detection, in
which case the modem will not report the Presumed End of Message (Quiet) or
Presumed Hang Up (Silence) event reports.
AT+VSD=<sds>,<sdi>
<sds> A decimal number corresponding to the selected parameter:
<sdi>
OK if values are valid.
ERROR if one or more of the following apply: 1) the <sds> or <sdi> parameter
entered is out of range, or 2) either of the two parameters is missing from the
command string. If an error occurs, modem retains the previous <sds> and <sdi>
parameter values.
+VSD?
+VSD=?
0
127 Sets less aggressive long-term silence detection independent of
128 Sets nominal long-term silence detection independent of presence or
129 Sets more aggressive long-term detection independent of presence or
A decimal number specifying the required period of silence in units of 0.1
Displays current or selected values.
Displays a list of the supported values.
Use +VSM silence compression setting and algorithm for long-term
silence detection if +VSM is in use
OR
Use default long-term setting silence detection level and algorithm if
+VSM is not in use.
presence or use of silence compression.
use of silence compression.
use of silence compression.
seconds, before the modem can report silence detected at the end of a
voice receive either with the Presumed End of Message (QUIT) or
Presumed Hang up (SILENCE) event reports. A value of 0 disables the
modem silence detection. The range is 0.1 to 25.5 seconds for <sdi>=1
to 255.
Chapter 4 – Voice Commands
51