Multitech MultiModem Cell MTCBA-C1 User's Guide Page 79
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Chapter 15 – Audio Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 79
Chapter 15 – Audio Commands
Audio Subsystem Overview
The audio sub-system block diagram below indicates where the various gains and AT commands take effect.
Since the AT command values are saved separately for each audio path, the audio gains should be tuned
independently for each audio path. Note that the +CLVL is intended to operate like a volume control, so it should
be set to 0dB gain during the tuning process (this is the default value).
Tuning Audio
Note: PCM digital voice is not supported in the Multi-Tech models.
Audio parameters need to be set for each device connected to the audio sub-system. The audio parameters are
saved independently for the three audio paths: Analog 1 and Analog 2. Tune the audio parameters using the
procedures detailed below.
Analog
1. Select the relevant audio path, and issue the AT+VIP command the set the audio parameters to their
default values.
2. Set +MGE so that the microphone output plus MGE gain is 23dB to 25dB below 2.828Vpp.
3. Make a voice call.
4. Adjust +VGT to appropriate levels.
5. Adjust +VGR to appropriate levels.
6. Adjust +WSDG, if applicable.
- CDMA-C1 AT Commands 1
- Contents 3
- Chapter 1 – Introduction 7
- Chapter 2 – AT Commands 8
- Overview 8
- Command Types 9
- Command Format and Syntax 9
- Input Command Syntax 10
- Other Syntax 10
- Output Response Syntax 10
- Parameter Defaults 10
- Unsolicited Message Syntax 11
- Attention AT 12
- Repeat Last Command A/ 12
- Echo E 12
- Bits +WUSLMSK 13
- Chapter 4 – Identification 15
- Commands 15
- Chapter 5 – Query Commands 17
- Chapter 6 – Global 18
- Configuration Commands 18
- Save Configuration &W 19
- Chapter 7 – Status Commands 20
- Chapter 8 – Communication 26
- Set Diagnostic Port +WDMX 27
- Set DCD Signal &C 27
- Set DTR Signal &D 28
- Set DSR Signal &S 28
- Automatic Answer S0 30
- Command Edit Character S5 31
- Chapter 9 – Call Control 33
- Hang-Up Command H 34
- Answer a Call A 34
- Incoming Call +RING 35
- Emergency Mode +WSOS 37
- Call Answered +WANS 38
- Call Connected +WCNT 38
- Call Ended +WEND 39
- Call Originated +WORG 40
- CPHS Command +CPHS 40
- Call Forwarding +CCFC 42
- Send DTMF Tones +VTS 44
- Chapter 10 – Network Service 45
- Signal Quality +CSQ 46
- Band Preference +WBND 49
- Service Indication +WSRV 50
- Roam Preference +WRMP 50
- Default Cell Band +WDCB 51
- Roaming Indication +WROM 51
- Chapter 11 – Provisioning 54
- Control Commands 54
- Excess SPC Failures +WLCK 55
- Download PRL +DPRL 56
- Commit Changes +WCMT 58
- Set IMSI +WIMI 58
- Slot Cycle Index +WSCI 60
- SID and NID +WSID 60
- Chapter 12 – OTASP / OTAPA 61
- Commit Successful +WOTC 62
- SPL Unlocked +WOTS 62
- NAM Download OK +WOTN 62
- MDM Download OK +WOTM 62
- IMSI Download OK +WOTI 63
- PRL Download OK +WOTP 63
- Chapter 14 – Short Message 70
- Service Control Commands 70
- Read Message +CMGR 71
- List Message +CMGL 72
- Delete Message +CMGD 73
- Chapter 15 – Audio Commands 79
- Microphone Gain +VGT 81
- Speaker Gain Control +VGR 82
- Digital Gain Receive +WDGR 84
- Echo Cancellation +ECHO 86
- Speaker Driver Gain +WSDG 87
- Audio Loopback &T 88
- Chapter 16 – Data Commands 89
- R-SCH Selection $QCMIP 90
- MIP Selection $QCMIPP 91
- Chapter 17 – TCP APP AT 98
- Chapter 18 – Sleep Commands 107
- Builds) 111
- Chapter 19 – Antenna 111
- Commands (Not for IP and GPS 111
- +WANTPOLL 113
- Auxiliary GPS Power +WANT 115
- Scenarios 118
- Call Processing 119
- Sending Binary Data 120
- TCP Socket Examples 121
- TCP Server Example 122
- ATZ, and AT&F 123
- Chapter 22 – CDMA 128
- Terminology and Acronyms 128
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