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Multi-Tech Systems MT5634SMI V.34 Command +VSM=? Report Voice Compression Method, At+Vsm=?, 115

Models: MT5634SMI V.34 MT5634SMI V.92

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Chapter 4 – Voice Commands

Command:

+VSM=?

Report Voice Compression Method

Result Codes:

OK

 

Description:

The +VSM=? command reports several compression method identifiers in one of two

 

ways: either 1) a compression method (for PCM coding) from the table below, or 2) a co-

 

operative identifier (non-PCM coding) used with other manufacturer's equipment.

 

Example: The following shows an inquiry about the modem support of compression and

 

other data. In this example, the modem reports that it supports two compression

 

methods.

 

 

AT+VSM=?

 

 

128,"SIGNED PCM",12,0,(7200-8000,11025),(127-129),(0-50)

 

132,"ADPCM/AQ",2,40,(7200),(128),(0-50)

 

The compression method identifiers for PCM coding display the general classification of

 

the compression method in the form <cmid>.

 

Non-PCM coding reports the compression method identifiers in the form

 

<cmid>/<author>, where <cmid> is the general classification of the compression method

 

and <author> is the source of the method. The source <author> may be a proprietary

 

method or it may reference a published standard. Each field limit is 20 characters. The

 

+VXT command starts a translation to or from a particular manufacturer's proprietary

 

voice data stream format to an unsigned (non-PCM) format.

 

Identifier

Description

 

Signed PCM

Linear PCM sampling using twos complement signed numbers

 

Unsigned PCM

Linear PCM sampling using unsigned numbers

 

A-Log/Author

Compression using a-law

 

U-Log/Author

Compression using u-law

 

DPCM/Author

Differential Pulse Coded Modulation

 

DPCMAQ/Author

Differential Pulse Coded Modulation with Adaptive Quantizier

 

ADPCM/Author

Adaptive Differential Pulse Coded Modulation

 

VSELP/Author

Vector Sum Exited Linear Predictor

 

RELP/Author

Residual Exited Linear Predictor

 

CELP/Author

Code Book Exited Linear Predictor

 

CVSD/Author

Continuously Variable Slope Delta Modulation

 

TDHS/Author

Time Domain Harmonic Distortion

 

ADM/Author

Adaptive Delta Modulation

 

DM/Author

Delta Modulation

 

APC/Author

Adaptive Predictive Coding

 

ATC/Author

Adaptive Transform Coding

 

SBC/Author

Sub-Band Coding

 

GSM/Author

Regular Pulse Exitation Long-term Predictor (RPELTP)

 

LPC/Author

Linear Predictive Coding

 

EAPDPCM/Author Embedded Bit ADPCM

 

MP-LPC/Author

Multi-pulse LPC

 

LSLTCQ

Least Squares Lattice Trellis Coded Quantization

 

IS-101 does not make any provisions for standard compression modifiers.

Command:

+VTD=<dur>

Select Default Beep Tone Duration Timer

 

 

(DTMF/Tone Generation Duration)

Result Codes:

OK if the modem accepts the command; ERROR if the parameter is out of range.

Description:

The +VTD= command causes the modem to set the default DTMF/tone generation

 

duration used with the +VTS command. This command does not affect the ATD

 

command settings. The <dur> parameter range is given by the +VTD=? command, in

 

units of 0.01 seconds. A setting of +VTD=0 specifies a manufacturer-specific time

 

interval.

 

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C)

115

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Multi-Tech Systems MT5634SMI V.34 Command +VSM=? Report Voice Compression Method, At+Vsm=?, Identifier Description, Lsltcq
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MT5634SMI V.34, MT5634SMI V.92 specifications

The Multi-Tech Systems MT5634SMI is a versatile and robust external modem designed to cater to a variety of communication needs. As a V.92/V.34 standard modem, it provides reliable and efficient data connections for both home and business users. Its unique blend of features and technologies makes it an excellent choice for users looking to achieve optimal performance in their data transmission.

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In terms of form factor, the MT5634SMI is an external modem, which allows for easy installation and portability. Its compact design ensures it can fit into any workspace without taking up much room or adding clutter. The modem connects to computers via standard serial ports, making it compatible with a wide range of devices, both modern and legacy.

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