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AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 5-17
+VSD - Silence Detection (Quiet and Silence)
This command causes the modem to set 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” (QUIT) or “Presumed Hangup (SILENCE)
event reports.
Syntax
+VSD=<sds>,<sdi>
Defined Values
<sds> Decimal number corresponding to the selected parameter.
0 Use +VSM silence compression setting and
algorithm for long-term silence detection (if
+VSM is in use) or proprietary silence
compression setting and algorithm for long-term
silence detection (if +VSM is not in use).
127 Sets less aggressive long-term silence detection
independent of presence or use of silence
compression.
128 Sets nominal long-term silence detection
independent of presence or use of silence
compression.
129 Sets more aggressive long-term silence detection
independent of presence or use of silence
compression.
<sdi> Decimal number specifying the required period of silence, in
units of 0.1 second, before the modem can report silence
detected at the end of a voice receive either with the
“Presumed End of Message” (QUIT) or “Presumed Hangup
(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.
Reporting Current or Selected Values
Command: +VSD?
Response: <sds>,<sdi>
Example: 0,50 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VSD=?
Response: (<sds> range),(<sdi> range)
Example: (0,127-129),(0-255)
Result Codes
OK <hook> = 0 or 1.
ERROR Otherwise, or if not in Voice Mode.
- Reference Manual 1
- Revision Record 2
- Contents 3
- Conexant v 5
- Conexant vii 7
- Conexant ix 9
- Conexant 102184B 10
- Revision History 11
- 1 Introduction 13
- 1.2 Reference Documentation 14
- 2 Syntax and Procedures 15
- 2.3 Basic Syntax Commands 16
- 2.3.2 S-Parameters 17
- 2.4.1 Command Naming Rules 18
- 2.4.2 Values 18
- 2.4.3 Action Commands 19
- 2.4.4 Parameter Commands 20
- Conexant 2-7 21
- Parameter Set Command Syntax 21
- 2.5 Issuing Commands 22
- 2.6 Executing Commands 22
- 2.7 Modem Responses 23
- Conexant 2-11 25
- Range of Values 25
- Compound Range of Values 25
- 3 Data Command Set 27
- 3.2.1 Generic Modem Control 28
- Conexant 3-3 29
- +VCID - Caller ID (CID) 29
- Conexant 3-5 31
- \N - Operating Mode 31
- I - Identification 32
- Conexant 3-7 33
- Conexant 3-9 35
- Conexant 3-11 37
- Conexant 3-13 39
- **- Load Flash Memory 40
- Conexant 3-15 41
- Conexant 3-17 43
- E - Command Echo 43
- V - Result Code Form 44
- W - Connect Message Control 44
- Conexant 3-19 45
- X - Extended Result Codes 45
- Conexant 3-21 47
- Conexant 3-23 49
- &C - RLSD (DCD) Option 50
- &D - DTR Option 50
- Conexant 3-25 51
- &K - Flow Control 51
- Conexant 3-27 53
- &Q - Sync/Async Mode 53
- &R - RTS/CTS Option 54
- &S - DSR Override 54
- Conexant 3-29 55
- +IPR - Fixed DTE Rate 56
- Conexant 3-31 57
- Conexant 3-33 59
- +IBC – In Band Commands 60
- Conexant 3-35 61
- 3.2.3 Call Control 63
- Conexant 3-39 65
- T - Set Tone Dial Default 66
- P - Set Pulse Dial Default 66
- A - Answer 66
- Conexant 3-41 67
- H - Disconnect (Hang-Up) 67
- Conexant 3-43 69
- L - Speaker Volume 69
- M - Speaker Control 69
- &G - Select Guard Tone 70
- Conexant 3-45 71
- Conexant 3-47 73
- Conexant 3-49 75
- *D - Display Delayed Numbers 75
- Conexant 3-51 77
- Conexant 3-53 79
- Conexant 3-55 81
- Conexant 3-57 83
- +MS - Modulation Selection 83
- Conexant 3-59 85
- Conexant 3-61 87
- Forward 87
- B - CCITT or Bell 88
- Conexant 3-63 89
- Conexant 3-65 91
- +ESR - Selective Repeat 91
- Conexant 3-67 93
- Conexant 3-69 95
- Conexant 3-71 97
- \K - Break Control 97
- -K - MNP Extended Services 98
- Conexant 3-73 99
- +DS - Data Compression 99
- Conexant 3-75 101
- Conexant 3-77 103
- 3.2.7 V.8/V.8bis Commands 104
- Conexant 3-79 105
- +A8I: - CI Signal Indication 105
- Conexant 3-81 107
- +H - Enable/Disable RPI 108
- Conexant 3-83 109
- 3.2.9 Diagnostic Commands 110
- Conexant 3-85 111
- Conexant 3-87 113
- Conexant 3-89 115
- Conexant 3-91 117
- %TT - PTT Test Command 118
- Conexant 3-93 119
- Conexant 3-95 121
- $F – Fast Connect Control 121
- +PCW - Call Waiting Enable 122
- Conexant 3-97 123
- +PMH - Modem-on-Hold Enable 123
- +PMHT – Modem-on-Hold Timer 124
- Conexant 3-99 125
- +PIG - PCM Upstream Ignore 126
- Conexant 3-101 127
- +PSS - Use Short Sequence 128
- Conexant 3-103 129
- 3.3 S-Parameters 130
- Conexant 3-105 131
- Conexant 102184B 132
- Conexant 3-107 133
- S5 - Backspace Character 133
- S11 - DTMF Tone Duration 134
- Conexant 3-109 135
- Conexant 3-111 137
- S19 - Reserved 137
- S20 - Reserved 137
- Conexant 3-113 139
- S24 - Sleep Inactivity Timer 139
- S25 - Delay To DTR Off 139
- S26 - RTS to CTS Delay 139
- Conexant 3-115 141
- S36 - LAPM Failure Control 142
- Conexant 3-117 143
- Conexant 3-119 145
- Conexant 3-121 147
- S210 – V.34 Symbol Rates 147
- 3.4 Result Codes 148
- Conexant 3-123 149
- Conexant 3-125 151
- Conexant 3-127 153
- 4.1 Fax I/O Processing 155
- 4.1.4 Fax Origination 157
- 4.1.5 Fax Answering 157
- 4.1.7 Fax Control Reception 157
- 4.1.8 Fax Data Transmission 158
- 4.1.9 Fax Data Reception 159
- 4.2 Commands and Parameters 160
- Conexant 4-7 161
- +FAE - Auto Answer Enable 161
- +FTS - Transmit Silence 161
- +FRS - Receive Silence 162
- Conexant 4-9 163
- +FTM - Transmit Facsimile 163
- +FRM - Receive Facsimile 164
- Conexant 4-11 165
- Conexant 4-13 167
- +FCL - Carrier Loss Timeout 168
- Conexant 4-15 169
- Conexant 4-17 171
- +FPR - Fixed DTE Rate 171
- 4.3 Examples 173
- Conexant 4-21 175
- 5 Voice Commands 177
- Conexant 5-3 179
- 5.2 Voice Commands 180
- 5.2.2 Voice Commands 181
- Conexant 5-7 183
- +VTS - Send Voice Tone(s) 183
- Conexant 5-9 185
- Conexant 5-11 187
- Conexant 5-13 189
- Conexant 5-15 191
- Conexant 5-17 193
- Conexant 5-19 195
- +VDR - Distinctive Ring 196
- Conexant 5-21 197
- 5.2.3 Speakerphone Commands 199
- Conexant 5-25 201
- +VGM - Microphone Gain 201
- +VGS - Speaker Gain 202
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