Comtrol AT Commands User Manual

AT Commands for CX81801 SmartV.XX, CX06833 SMXXD, CX81300 SmartACF, and CX06827 SCXXD Modems
Reference Manual
Doc. No. 102184B July 1, 2003
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Revision Record
Revision Date Comments
B 7/1/2003 Rev. B release. A 5/23/2003 Initial release.
Ā© 2003 Conexant Systems, Inc. All Rights Reserved.
Information in this document is provided in connection with Conexant Systems, Inc. (ā€œConexantā€) products. These materials are provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.
THESE MATERIALS ARE PROVIDED ā€œAS ISā€ WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. CONEXANT FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. CONEXANT SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
Conexant products are not intended for use in medical, lifesaving or life sustaining applications. Conexant customers using or selling Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from such improper use or sale.
The following are trademarks of Conexant Systems, Inc.: Conexant and the Conexant C symbol, SmartDAA, SmartSCM, SmartACF, and ConfigurACE. Product names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. Third-party brands and names are the property of their respective owners.
For additional disclaimer information, please consult Conexant’s Legal Information posted at www.conexant.com, which is incorporated by reference.
Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and suggestions to tech.pubs@conexant.com. For technical questions, contact your local Conexant sales office or field applications engineer.
ii
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Contents
Revision History.............................................................................................................................................xi
1 Introduction..........................................................................................................................................1-1
1.1 Overview ......................................................................................................................................................................... 1-1
1.1.1 Command Syntax ........................................................................................................................................... 1-1
1.1.2 Command Descriptions .................................................................................................................................. 1-1
1.1.3 Call Progress and Blacklisting Parameters..................................................................................................... 1-1
1.1.4 ConfigurACE II for Windows Utility Program ................................................................................................. 1-2
1.2 Reference Documentation .............................................................................................................................................. 1-2
2 Syntax and Procedures.........................................................................................................................2-1
2.1 Alphabet.......................................................................................................................................................................... 2-1
2.2 DTE Commands Lines .................................................................................................................................................... 2-1
2.2.1 Command Line General Format...................................................................................................................... 2-1
2.2.2 Command Line Editing ................................................................................................................................... 2-2
2.2.3 Command Line Echo ...................................................................................................................................... 2-2
2.2.4 Repeating a Command Line ........................................................................................................................... 2-2
2.2.5 Types of DTE Commands ............................................................................................................................... 2-2
2.3 Basic Syntax Commands ................................................................................................................................................ 2-2
2.3.1 Basic Syntax Command Format ..................................................................................................................... 2-2
2.3.2 S-Parameters.................................................................................................................................................. 2-3
2.4 Extended Syntax Commands .......................................................................................................................................... 2-4
2.4.1 Command Naming Rules................................................................................................................................ 2-4
2.4.2 Values............................................................................................................................................................. 2-4
Numeric Constants ................................................................................................................................. 2-4
String Constants..................................................................................................................................... 2-5
Compound Values .................................................................................................................................. 2-5
2.4.3 Action Commands .......................................................................................................................................... 2-5
Action Execution Command Syntax........................................................................................................ 2-5
Action Test Command Syntax ................................................................................................................ 2-6
2.4.4 Parameter Commands.................................................................................................................................... 2-6
Parameter Types..................................................................................................................................... 2-6
Parameter Set Command Syntax............................................................................................................ 2-7
Parameter Read Command Syntax......................................................................................................... 2-7
Parameter Test Command Syntax .......................................................................................................... 2-7
2.4.5 Additional Syntax Rules.................................................................................................................................. 2-7
Concatenating Commands after Extended Syntax Commands............................................................... 2-7
Concatenating Commands after Basic Format Commands .................................................................... 2-8
2.5 Issuing Commands......................................................................................................................................................... 2-8
102184B Conexant iii
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Executing Commands..................................................................................................................................................... 2-8
2.6
2.6.1 Aborting Commands ...................................................................................................................................... 2-8
2.6.2 Handling of Invalid Numbers and S-Parameter Values .................................................................................. 2-9
2.7 Modem Responses......................................................................................................................................................... 2-9
2.7.1 Responses...................................................................................................................................................... 2-9
2.7.2 Extended Syntax Result Codes ..................................................................................................................... 2-10
2.7.3 +<name>: <compound_value>Information Text Formats for Test Commands............................................ 2-11
Range of Values.................................................................................................................................... 2-11
Compound Range of Values ................................................................................................................. 2-11
3 Data Command Set...............................................................................................................................3-1
3.1 Command Guidelines...................................................................................................................................................... 3-1
3.1.1 Escape Code Sequence................................................................................................................................... 3-1
3.2 Data Commands ............................................................................................................................................................. 3-1
3.2.1 Generic Modem Control ................................................................................................................................. 3-2
Z - Soft Reset and Restore Profile.......................................................................................................... 3-2
+FCLASS - Select Active Service Class................................................................................................... 3-2
+VCID - Caller ID (CID)........................................................................................................................... 3-3
+VRID - Report Retrieved Caller ID (CID)............................................................................................... 3-4
\N - Operating Mode ............................................................................................................................... 3-5
I - Identification ...................................................................................................................................... 3-6
+GMI - Request Manufacturer Identification .......................................................................................... 3-7
+GMI9 - Request Conexant Identification............................................................................................... 3-7
+GMM - Request Model Identification.................................................................................................... 3-8
+GMR - Request Revision Identification ................................................................................................ 3-8
+GCAP - Request Complete Capabilities List.......................................................................................... 3-8
+GCI - Country of Installation................................................................................................................. 3-9
&F - Restore Factory Configuration (Profile) ........................................................................................ 3-10
&T - Local Analog Loopback Test ........................................................................................................ 3-10
&Y - Designate a Default Reset Profile................................................................................................. 3-11
&W - Store Current Configuration ........................................................................................................ 3-11
&Zn=x - Store Telephone Number........................................................................................................ 3-12
%7 - Plug and Play Serial Number .......................................................................................................3-12
%8 - Plug and Play Vendor ID and Product Number ........................................................................... 3-13
**- Load Flash Memory........................................................................................................................ 3-14
3.2.2 DTE-Modem Interface commands................................................................................................................ 3-17
E - Command Echo............................................................................................................................... 3-17
Q - Quiet Results Codes Control........................................................................................................... 3-17
V - Result Code Form ........................................................................................................................... 3-18
W - Connect Message Control.............................................................................................................. 3-18
X - Extended Result Codes ................................................................................................................... 3-19
&C - RLSD (DCD) Option ..................................................................................................................... 3-24
&D - DTR Option .................................................................................................................................. 3-24
&K - Flow Control ................................................................................................................................. 3-25
&M - Asynchronous/Synchronous Mode Selection ............................................................................. 3-26
&Q - Sync/Async Mode ........................................................................................................................ 3-27
&R - RTS/CTS Option ........................................................................................................................... 3-28
iv
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&S - DSR Override ............................................................................................................................... 3-28
&X - Select Synchronous Clock Source ............................................................................................... 3-29
+IPR - Fixed DTE Rate .......................................................................................................................... 3-30
+IFC - DTE-Modem Local Flow Control ................................................................................................ 3-31
+ILRR - DTE-Modem Local Rate Reporting ......................................................................................... 3-32
+IBC – In Band Commands .................................................................................................................. 3-34
3.2.3 Call Control................................................................................................................................................... 3-37
D - Dial.................................................................................................................................................. 3-37
T - Set Tone Dial Default....................................................................................................................... 3-40
P - Set Pulse Dial Default...................................................................................................................... 3-40
A - Answer............................................................................................................................................ 3-40
H - Disconnect (Hang-Up) .................................................................................................................... 3-41
O - Return to On-Line Data Mode......................................................................................................... 3-42
L - Speaker Volume .............................................................................................................................. 3-43
M - Speaker Control ............................................................................................................................. 3-43
&G - Select Guard Tone........................................................................................................................ 3-44
&P - Select Pulse Dial Make/Break Ratio.............................................................................................. 3-44
&V - Display Current Configuration and Stored Profiles ...................................................................... 3-45
&V1 - Display Last Connection Statistics ............................................................................................. 3-46
\V - Single Line Connect Message Enable ............................................................................................ 3-47
%L - Report Line Signal Level.............................................................................................................. 3-48
%Q - Report Line Signal Quality........................................................................................................... 3-48
*B - Display Blacklisted Numbers ........................................................................................................ 3-48
*D - Display Delayed Numbers............................................................................................................. 3-49
–PPD= - Extension Pickup Notification through 16550 UART ............................................................. 3-49
–STE= - Set Telephony Extension......................................................................................................... 3-50
-TRV – Tip & Ring Voltage ................................................................................................................... 3-55
-TTE - Threshold Adjustments for Telephony Extension ...................................................................... 3-56
3.2.4 Modulation Control Commands ................................................................................................................... 3-57
+MS - Modulation Selection ................................................................................................................. 3-57
+MR - Modulation Reporting Control................................................................................................... 3-59
%E - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward ......................... 3-61
B - CCITT or Bell ................................................................................................................................... 3-62
3.2.5 Error Control Commands ............................................................................................................................. 3-63
+ES - Error Control and Synchronous Mode Selection ........................................................................ 3-63
+EB - Break Handling in Error Control Operation .................................................................................3-65
+ESR - Selective Repeat ....................................................................................................................... 3-65
+EFCS - 32-bit Frame Check Sequence ................................................................................................ 3-66
+ER - Error Control Reporting .............................................................................................................. 3-67
+ETBM - Call Termination Buffer Management .................................................................................... 3-69
\B - Transmit Break to Remote ............................................................................................................. 3-70
\K - Break Control ................................................................................................................................. 3-71
-K - MNP Extended Services ................................................................................................................ 3-72
3.2.6 Data Compression Commands..................................................................................................................... 3-73
+DS - Data Compression...................................................................................................................... 3-73
+DS44 - V.44 Compression Select ....................................................................................................... 3-74
102184B Conexant v
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+DR - Data Compression Reporting..................................................................................................... 3-75
%C - Enable/Disable Data Compression............................................................................................... 3-77
3.2.7 V.8/V.8bis Commands.................................................................................................................................. 3-78
+A8E - V.8 and V.8bis Operation Controls ........................................................................................... 3-78
+A8I: - CI Signal Indication................................................................................................................... 3-79
3.2.8 Synchronous Access Mode Commands....................................................................................................... 3-80
+ESA - Configure Synchronous Access Submode ............................................................................... 3-80
+H - Enable/Disable RPI ....................................................................................................................... 3-82
+ITF - Transmit Flow Control Thresholds ............................................................................................. 3-83
3.2.9 Diagnostic Commands ................................................................................................................................. 3-84
#UD – Last Call Status Report .............................................................................................................. 3-84
%TT - PTT Test Command ................................................................................................................... 3-92
3.2.10 Compatibility Commands ............................................................................................................................. 3-93
&L - Leased Line Operation.................................................................................................................. 3-93
)M - Enable Cellular Power Level Adjustment ...................................................................................... 3-93
@M - Initial Cellular Power Level Setting .............................................................................................3-94
:E - Compromise Equalizer Enable Command ...................................................................................... 3-94
3.2.11 Fast Connect Commands.............................................................................................................................. 3-95
$F – Fast Connect Control .................................................................................................................... 3-95
3.2.12 V.92 +P and –Q Commands ......................................................................................................................... 3-96
+PCW - Call Waiting Enable.................................................................................................................. 3-96
+PMH - Modem-on-Hold Enable .......................................................................................................... 3-97
+PMHT – Modem-on-Hold Timer......................................................................................................... 3-98
+PMHR - Initiate Modem-on-Hold........................................................................................................ 3-99
+PIG - PCM Upstream Ignore............................................................................................................. 3-100
+PMHF - V.92 Modem-on-Hold Hook Flash ....................................................................................... 3-100
+PQC - V.92 Phase 1 and Phase 2 Control......................................................................................... 3-101
+PSS - Use Short Sequence ............................................................................................................... 3-102
-QCPC - Force Full Startup Procedure Next Connection..................................................................... 3-103
-QCPS - Enable Quick Connect Profile Save....................................................................................... 3-103
3.3 S-Parameters.............................................................................................................................................................. 3-104
S - Read/Write S-Parameter ............................................................................................................... 3-104
3.3.1 Factory Defaults.......................................................................................................................................... 3-104
3.3.2 S-Parameter Definitions ............................................................................................................................. 3-106
S0 - Number of Rings to Auto-Answer............................................................................................... 3-106
S1 - Ring Counter............................................................................................................................... 3-106
S2 - Escape Character ........................................................................................................................ 3-106
S3 - Carriage Return Character .......................................................................................................... 3-106
S4 - Line Feed Character .................................................................................................................... 3-106
S5 - Backspace Character................................................................................................................... 3-107
S6 - Wait Time before Blind Dialing or for Dial Tone.......................................................................... 3-107
S7 - Wait Time for Carrier, Silence, or Dial Tone................................................................................ 3-107
S8 - Pause Time For Dial Delay .......................................................................................................... 3-108
S9 - Carrier Detect Response Time ....................................................................................................3-108
S10 - Lost Carrier To Hang Up Delay ................................................................................................. 3-108
S11 - DTMF Tone Duration................................................................................................................. 3-108
vi
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
S12 - Escape Prompt Delay (EPD) ..................................................................................................... 3-109
S14 - General Bit Mapped Options Status .......................................................................................... 3-109
S16 - Test Mode Bit Mapped Options Status ..................................................................................... 3-109
S17 - Point Of Sale Options Selection ................................................................................................ 3-110
S19 - Reserved................................................................................................................................... 3-111
S20 - Reserved................................................................................................................................... 3-111
S21 - V.24/General Bit Mapped Options Status.................................................................................. 3-112
S22 - Speaker/Results Bit Mapped Options Status ............................................................................3-112
S23 - General Bit Mapped Options Status .......................................................................................... 3-113
S24 - Sleep Inactivity Timer ............................................................................................................... 3-113
S25 - Delay To DTR Off ...................................................................................................................... 3-113
S26 - RTS to CTS Delay...................................................................................................................... 3-113
S27 - Bit Mapped Options Status ....................................................................................................... 3-114
S28 - Bit Mapped Options Status ....................................................................................................... 3-114
S29 - Flash Dial Modifier Time ........................................................................................................... 3-115
S30 - Disconnect Inactivity Timer ...................................................................................................... 3-115
S31 - Bit Mapped Options Status ....................................................................................................... 3-115
S36 - LAPM Failure Control................................................................................................................ 3-116
S38 - Delay Before Forced Hang Up ................................................................................................... 3-116
S39 - Flow Control Bit Mapped Options Status .................................................................................. 3-117
S40 - General Bit Mapped Options Status .......................................................................................... 3-117
S41 - General Bit Mapped Options Status .......................................................................................... 3-118
S46 - Data Compression Control........................................................................................................ 3-118
S48 - V.42 Negotiation Control .......................................................................................................... 3-118
S86 - Call Failure Reason Code .......................................................................................................... 3-119
S91 - PSTN Transmit Attenuation Level............................................................................................. 3-120
S92 - Fax Transmit Attenuation Level................................................................................................. 3-120
S95 - Extended Result Codes Control ................................................................................................ 3-120
S210 – V.34 Symbol Rates................................................................................................................. 3-121
3.4 Result Codes............................................................................................................................................................... 3-122
4 Fax Class 1 and Fax Class 1.0 Commands............................................................................................4-1
4.1 Fax I/O Processing.......................................................................................................................................................... 4-1
4.1.1 DTE-to-Modem Transmit Data Stream ........................................................................................................... 4-1
4.1.2 Modem-to-DTE Receive Data Stream............................................................................................................. 4-1
4.1.3 Fax Mode Selection ........................................................................................................................................ 4-1
4.1.4 Fax Origination ............................................................................................................................................... 4-3
4.1.5 Fax Answering ................................................................................................................................................ 4-3
4.1.6 Fax Control Transmission............................................................................................................................... 4-3
4.1.7 Fax Control Reception .................................................................................................................................... 4-3
4.1.8 Fax Data Transmission ................................................................................................................................... 4-4
4.1.9 Fax Data Reception......................................................................................................................................... 4-5
4.2 Commands and Parameters ........................................................................................................................................... 4-6
4.2.1 Mode Entry Commands.................................................................................................................................. 4-6
+FCLASS=1 - Select Facsimile Class 1 Mode ......................................................................................... 4-6
+FCLASS=1.0 - Select Facsimile Class 1.0 Mode...................................................................................4-6
4.2.2 Mode Commands ........................................................................................................................................... 4-6
102184B Conexant vii
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+FAA - Auto Answer Enable.................................................................................................................... 4-6
+FAE - Auto Answer Enable .................................................................................................................... 4-7
+FTS - Transmit Silence ......................................................................................................................... 4-7
+FRS - Receive Silence........................................................................................................................... 4-8
+FTM - Transmit Facsimile ..................................................................................................................... 4-9
+FRM - Receive Facsimile .................................................................................................................... 4-10
+FTH - Transmit Data with HDLC Framing ........................................................................................... 4-11
+FRH - Receive Data with HDLC Framing............................................................................................. 4-12
4.2.3 Service Class 1 Parameters.......................................................................................................................... 4-13
+FAR - Adaptive Reception Control ...................................................................................................... 4-13
+FCL - Carrier Loss Timeout ................................................................................................................ 4-14
+FDD - Double Escape Character Replacement.................................................................................... 4-15
+FIT - DTE Inactivity Timeout ...............................................................................................................4-16
+FPR - Fixed DTE Rate ......................................................................................................................... 4-17
+FMI? - Request Manufacturer Identification....................................................................................... 4-18
+FMM? - Request Model Identification ................................................................................................4-18
+FMR? - Request Revision Identification ............................................................................................. 4-18
+FLO - Flow Control.............................................................................................................................. 4-19
4.3 Examples ...................................................................................................................................................................... 4-19
5 Voice Commands .................................................................................................................................5-1
5.1 Voice Commands Overview ............................................................................................................................................ 5-1
5.1.1 <DLE> Shielded Event Codes Sent to the DTE ............................................................................................... 5-2
5.1.2 <DLE> Shielded Codes Sent to the Modem (DCE) ......................................................................................... 5-3
5.2 Voice Commands............................................................................................................................................................ 5-4
5.2.1 Configuration Commands............................................................................................................................... 5-4
+FCLASS=8 - Select Voice Mode............................................................................................................ 5-4
+VNH - Automatic Hang-up Control ....................................................................................................... 5-4
5.2.2 Voice Commands ........................................................................................................................................... 5-5
+VIP - Voice Initialize All Parameters ..................................................................................................... 5-5
+VRX - Start Modem Receive (Record).................................................................................................. 5-5
+VTR - Start Voice Transmission and Reception (Voice Duplex)........................................................... 5-6
+VTS - Send Voice Tone(s) .................................................................................................................... 5-7
+VTX - Start Modem Transmit (Playback).............................................................................................. 5-9
+VGR - Voice Gain Receive (Record Gain) ............................................................................................. 5-9
+VGT - Voice Gain Transmit (Playback Volume) .................................................................................. 5-10
+VIT - Voice Inactivity Timer (DTE/Modem)......................................................................................... 5-11
+VLS - Analog Source/Destination Selection ....................................................................................... 5-11
+VRA - Ringback Goes Away Timer ..................................................................................................... 5-15
+VRN - Ringback Never Appeared Timer ............................................................................................. 5-16
+VSD - Silence Detection (Quiet and Silence) ...................................................................................... 5-17
+VSM - Compression Method Selection .............................................................................................. 5-18
+VTD - Beep Tone Duration Timer........................................................................................................ 5-19
+VDR - Distinctive Ring........................................................................................................................ 5-20
+VDT - Control Tone Cadence Reporting ............................................................................................. 5-21
+VPR - Select DTE/Modem Interface Rate (Turn Off Autobaud) .......................................................... 5-22
5.2.3 Speakerphone Commands ........................................................................................................................... 5-23
viii
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+VSP - Speakerphone ON/OFF ............................................................................................................. 5-23
+VDX - Speakerphone Duplex Mode .................................................................................................... 5-24
+VGM - Microphone Gain..................................................................................................................... 5-25
+VGS - Speaker Gain ............................................................................................................................ 5-26
102184B Conexant ix
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Tables
Table 3-1. Upload Messages............................................................................................................................................. 3-15
Table 3-2. Result Codes.................................................................................................................................................... 3-21
Table 3-3. Supported V.80 Commands............................................................................................................................. 3-35
Table 3-4. +MS Command Supported Rates .................................................................................................................... 3-57
Table 3-5. AT#UD Last Call Status Report Format............................................................................................................ 3-87
Table 3-6. Call Setup Result Codes................................................................................................................................... 3-88
Table 3-7. Multimedia Modes ........................................................................................................................................... 3-88
Table 3-8. DTE-DCE modes .............................................................................................................................................. 3-88
Table 3-9. V.34 INFO bit report ......................................................................................................................................... 3-88
Table 3-10. gstnModulationSchemeActive from 3.7.2/V.58 ............................................................................................. 3-89
Table 3-11. errorControl Active from 3.5.2/V.58 .............................................................................................................. 3-89
Table 3-12. compressionActive from 3.2.2/V.58 .............................................................................................................. 3-89
Table 3-13. callCleared codes from 3.6.4/V.58-1994 ....................................................................................................... 3-90
Table 3-14. Completed Data Call, with some errors and rate retrain during the call ........................................................ 3-91
Table 3-15. S-Parameter Summary ................................................................................................................................ 3-105
Table 3-16. Result Code Definitions ............................................................................................................................... 3-123
Table 4-1. Fax Class 1 and Fax Class 1.0 Commands......................................................................................................... 4-2
Table 4-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates ............................................................................ 4-9
Table 4-3. Inactivity Timer Start and Stop Events............................................................................................................. 4-16
Table 4-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)............................................................................ 4-20
Table 4-5. Fax Class 1 Answering Sequence (Receiving a Single Page)........................................................................... 4-21
Table 5-1. Voice Commands............................................................................................................................................... 5-1
Table 5-2. Supported <DLE> Shielded Codes Sent to the DTE ........................................................................................... 5-2
Table 5-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE) ........................................................................... 5-3
Table 5-4. +VNH Command Behavior ................................................................................................................................. 5-4
Table 5-5. +VLS Command Options ................................................................................................................................. 5-13
Table 5-6. Events Detectable in the Voice Mode per V.253 .............................................................................................. 5-14
x
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Revision History
Incorporated in Doc. No. 102184B
1.
Section 3.2.1, Revised ** command description.
2. Section 3.2.4: Deleted %U command description.
3. Section 3.2.11, Revised %F command description.
4. Table 3-15: Added S17 row.
Incorporated in Doc. No. 102184A
Initial release.
102184B Conexant xi
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
This page is intentionally blank.
xii
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

1 Introduction

1.1 Overview

This manual describes the host command and responses for the following Conexant modem families:
CX81801 SmartV.XX Modem
CX06833 SMXXD Modem
CX81300 SmartACF Modem
CX06827 SCXXD Modem
The commands and responses are implemented in controller firmware for specific modem models. Additional configuration and implementation information is available in release notes and/or readme files that accompany product firmware release.
The descriptions in this manual apply to all commands and parameters that may be supported by different modem models.

1.1.1 Command Syntax

The fundamental DTE interface command syntax is described in Section 2.

1.1.2 Command Descriptions

Commands are grouped into the following categories:
Syntax and procedures Section 2 Data commands Section 3 Fax Class 1 and Fax Class 1.0 commands Section 4 Voice/Audio commands Section 5

1.1.3 Call Progress and Blacklisting Parameters

The SmartACF, SmartACFL, and SCXXD modem MCU firmware may be provided either in reconfigurable form or preconfigured form. Consult the specific firmware release notes for exact configuration information.
Reconfigurable Form. The modem MCU firmware can be configured for operation in specific countries by the PC-compatible ConfigurACE II program. The call progress and blacklisting parameters described in the ConfigurACE II User's Manual can be altered and loaded for a number of countries by this program.
Preconfigured Form. Specific MCU firmware configurations may be released that can be directly installed without requiring the use of ConfigurACE II.
102184B Conexant 1-1
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

1.1.4 ConfigurACE II for Windows Utility Program

The PC-based ConfigurACE II for Windows utility program allows the OEM to customize SmartACF and SmartACFL modem firmware to suit specific application and country requirements. ConfigurACE II for Windows allows programming of functions such as:
• Loading of multiple sets of country parameters
• Loading of NVRAM factory profiles
• Call progress and blacklisting parameters
• Entry of S parameter maximum/minimum/default values
• Limitation of transmit levels
• Modification of factory default values
• Customization of the ATI4 response
• Customization of fax OEM messages
• Enabling of Telephony Extension features
• Direct Mode
This program modifies the hex object code which can be programmed directly into the system Flash ROM. Lists of the generated parameters can be displayed or printed.
Conexant-provided country parameter files allow a complete set of country-specific call progress and blacklisting parameters to be selected.
Refer to the ConfigurACE II for Windows software for a detailed description of capabilities and the operating procedure.

1.2 Reference Documentation

Document Title Document No.
CX81300 SmartACF Modem Data Sheet 100488 CX06827 SCXXD Modem Device Set Data Sheet 101098 CX06833 SMXXD Modem Device Set Data Sheet 101840 CX81801-3x SmartV.XX Modem with 128-Pin TQFP Data Sheet 101898 CX81801-7x/8x SmartV.XX Modem with 128-Pin TQFP Data Sheet 102199 CX81801-4x SmartV.XX Modem with 28-Pin CTLGA Data Sheet 102025 CX81801-9x SmartV.XX-V.92 Modem with 28-Pin CTLGA Data Sheet 102179
1-2
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

2 Syntax and Procedures

The command and response syntax and procedures generally conform to referenced recommendations and standards. Since these recommendations and standards describe characteristics universal to a large installed base of modems to a maximum degree, there may be syntax and procedural differences due to extensions and behavioral differences in implemented commands, parameters, and responses beyond that described in these recommendations and standards.
The syntax and procedures described in this section are based on V.250 and V.253 with additional information included for implemented extensions, behavioral differences beyond V.250, and legacy commands.

2.1 Alphabet

The T.50 International Alphabet 5 (IA5) is used in this document. Only the low-order seven bits of each character are significant to the modem; any eighth or higher-order bit(s), if present, are ignored for the purpose of identifying commands and parameters. Lower-case characters are considered identical to their upper-case equivalents when received by the modem from the DTE. Result codes from the modem are in upper case.

2.2 DTE Commands Lines

Words enclosed in <angle brackets> are references to syntactical elements. The brackets are not used when the words appear in a command line, the brackets are not used. Words enclosed in [square brackets] represent optional items which may be omitted from the command line at the specified point. The square brackets are not used when the words appear in the command line. Other characters that appear in syntax descriptions must as included as shown.
Any modem responses are mentioned in terms of their alphabetic format; the actual response issued will depend on the setting of parameters that affect response formats, e.g., Q and V commands (see 2.7).

2.2.1 Command Line General Format

A command line is made up of three elements: the prefix, the body, and the termination character.
The command line prefix consists of the characters "AT" or "at" or, to repeat the execution of the previous command line, the characters "A/" or "a/".
The body is made up of individual commands described in this document. Space characters (IA5 2/0) are ignored and may be used freely for formatting purposes, unless they are embedded in numeric or string constants. The termination character may not appear in the body. The modem can accept at least 50 characters in the body.
The termination character may be selected by a user option (parameter S3), the default being CR.
102184B Conexant 2-1
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

2.2.2 Command Line Editing

The character defined by parameter S5 (default, BS) is interpreted as a request from the DTE to the modem to delete the previous character. Any control characters (IA5 0/0 through 1/15, inclusive) that remain in the command line after receipt of the termination character are ignored by the modem.
The modem checks characters from the DTE first to see if they match the termination character (S3), then the editing character (S5), before checking for other characters. This ensures that these characters will be properly recognized even if they are set to values that the modem uses for other purposes. If S3 and S5 are set to the same value, a matching character will be treated as matching S3 (S3 is checked before S5).

2.2.3 Command Line Echo

The modem may echo characters received from the DTE during command state and online command state back to the DTE, depending on the setting of the E command. If enabled, characters received from the DTE are echoed in the same format as received. Invalid characters in the command line or incomplete or improperly-formed command line prefixes may not be echoed.

2.2.4 Repeating a Command Line

If the prefix "A/" or "a/" is received, the modem immediately executes once again the body of the preceding command line. No editing is possible, and no termination character is necessary. A command line may be repeated multiple times in this manner. Responses to the repeated command line are issued using format of the original command line. If "A/" is received before any command line has been executed, the preceding command line is assumed to have been empty (that results in an OK result code).

2.2.5 Types of DTE Commands

There are two types of commands: action commands and parameter commands. Commands of either type may be included in command lines, in any order.
Action commands may be "executed" (to invoke a particular function of the equipment, which generally involves more than the simple storage of a value for later use), or "tested" (to determine whether or not the equipment implements the action command, and, if subparameters are associated with the action, the ranges of subparameter values that are supported).
Parameters may be "set" (to store a value or values for later use), "read" (to determine the current value or values stored), or "tested" (to determine whether or not the equipment implements the parameter, and the ranges of values supported).

2.3 Basic Syntax Commands

2.3.1 Basic Syntax Command Format

The format of Basic Syntax commands, except for the D and S commands, is as follows:
<command>[<number>]
2-2
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
where <command> is either a single character, or the "&" character followed by a single character per V.250. In addition, <command> can be the "%" character followed by a single character, the "*" character followed by a single character, or the "^" character followed by a single character.
<number> may be a string of one or more characters from "0" through "9" representing a decimal integer value. Commands that expect a <number> are noted in the description of the command. If a command expects <number> and it is missing (<command> is immediately followed in the command line by another <command> or the termination character), the value "0" is assumed. If a command does not expect a <number> and a number is present, an ERROR is generated. All leading "0"s in <number> are ignored by the modem.
Additional commands may follow a command (and associated parameter, if any) on the same command line without any character required for separation. The actions of some commands cause the remainder of the command line to be ignored (e.g., A).
See the D command for details on the format of the information that follows it.

2.3.2 S-Parameters

Commands that begin with the letter "S" are known as "S-parameters". The number following the "S" indicates the "parameter number" being referenced. If the number is not recognized as a valid parameter number, an ERROR result code is issued.
Immediately following this number, either a "?" or "=" character must appear. "?" is used to read the current value of the indicated S-parameter; "=" is used to set the S-parameter to a new value.
S<parameter_number>?
S<parameter_number>=[<value>]
If the "=" is used, the new value to be stored in the S-parameter is specified in decimal following the "=". If no value is given (i.e., the end of the command line occurs or the next command follows immediately), the S-parameter specified may be set to 0, or an ERROR result code issued and the stored value left unchanged. The ranges of acceptable values are given in the description of each S-parameter.
If the "?" is used, the modem transmits a single line of information text to the DTE. The text portion of this information text consists of exactly three characters, giving the value of the S-parameter in decimal, with leading zeroes included.
102184B Conexant 2-3
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

2.4 Extended Syntax Commands

2.4.1 Command Naming Rules

Both actions and parameters have names, which are used in the related commands. Names always begin with the character "+". Following the "+", from one to 16 additional characters appear in the command name. These characters will be selected from the following set:
A through Z (IA5 4/1 through 5/10)
0 through 9 (IA5 3/0 through 3/9)
! (IA5 2/1)
% (IA5 2/5)
- (IA5 2/13)
. (IA5 2/14)
/ (IA5 2/15)
: (IA5 3/10)
_ (IA5 5/15)
The first character following the "+" is an alphabetic character in the range of "A" through "Z". This first character generally implies the application in which a command is used (e.g., F for Fax or V for voice).

2.4.2 Values

The modem considers lower-case characters to be the same as their upper-case equivalents.
When subparameters are associated with the execution of an action, or when setting a parameter, the command may include specification of values. This is indicated by the appearance of <value> in the descriptions below.
<value> consists of either a numeric constant or a string constant.
Numeric Constants
Numeric constants are expressed in decimal, hexadecimal, or binary.
Decimal numeric constants consist of a sequence of one or more of the characters "0" through "9", inclusive.
Hexadecimal numeric constants consist of a sequence of one or more of the characters "0" through "9", inclusive, and "A" through "F" inclusive. The characters "A" through "F" represent the equivalent decimal values 10 through 15.
Binary numeric constants consist of a sequence of one or more of the characters "0" and "1".
In all numeric constants, the most significant digit is specified first. Leading "0" characters are ignored by the modem. No spaces, hyphens, periods, commas, parentheses, or other generally-accepted numeric formatting characters are permitted in numeric constants; note in particular that no "H" suffix is appended to the end of hexadecimal constants.
2-4
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
String Constants
String constants consist of a sequence of displayable IA5 characters, each in the range from 2/0 to 7/15, inclusive, except for the characters ā€˜"’ (IA5 2/2) and "\" (IA5 5/12). String constants are bounded at the beginning and end by the double-quote character (ā€˜"’, IA5 2/2).
Any character value may be included in the string by representing it as a backslash ("\") character followed by two hexadecimal digits. For example, "\0D" is a string consisting of the single character <CR> (IA5 0/13). If the "\" character itself is to be represented in a string, it is encoded as "\5C". The double-quote character, used as the beginning and ending string delimiter, is represented within a string constant as "\22".
A "null" string constant, or a string constant of zero length, is represented by two adjacent delimiters ("").
Compound Values
Actions may have more than one subparameter associated with them, and parameters may have more than one value. These are known as "compound values", and their treatment is the same in both actions and parameters.
A compound value consists of any combination of numeric and string values (as defined in the description of the action or parameter). The comma character must be included as a separator, before the second and all subsequent values in the compound value. If a value is not specified (i.e., defaults assumed), the required comma separator must be specified; however, trailing comma characters may be omitted if all associated values are also omitted.

2.4.3 Action Commands

Action Execution Command Syntax
There are two general types of action commands: those that have associated subparameter values that affect only that invocation of the command, and those that have no subparameters.
If subparameters are associated with a command, the definition of the action command indicates, for each subparameter, whether the specification of a value for that subparameter is mandatory or optional. For optional subparameters, the definition indicates the assumed (default) value for the subparameter if no value is specified for that subparameter; the assumed value may be either a previous value (i.e., the value of an omitted subparameter remains the same as the previous invocation of the same command, or is determined by a separate parameter or other mechanism), or a fixed value (e.g., the value of an omitted subparameter is assumed to be zero). Generally, the default value for numeric subparameters is 0, and the default value for string subparameters is "" (empty string).
The following syntax is used for actions that have no subparameters:
+<name>
102184B Conexant 2-5
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
The following syntax is used for actions that have one subparameter:
+<name>[=<value>]
The following syntax is used for actions that have two or more subparameters:
+<name>[=<compound_value>]
For actions that accept subparameters, if all subparameters are defined as being optional, and the default values for all subparameters are satisfactory, the data terminal equipment (DTE) may use the first syntax above (i.e., omit the "=" from the action execution command as well as all of the subparameter value string).
If all other relevant criteria are met (e.g., the modem is in the proper state), the command is executed with any indicated subparameters. If <name> is not recognized, the modem issues the ERROR result code and terminates processing of the command line. An ERROR is also generated if a subparameter is specified for an action that does not accept subparameters, if too many subparameters are specified, if a mandatory subparameter is not specified, if a value is specified of the wrong type, or if a value is specified that is not within the supported range.
Action Test Command Syntax
The DTE may test if an action command is implemented in the modem by using the syntax:
+<name>=?
If the modem does not recognize the indicated name, it returns an ERROR result code and terminates processing of the command line. If the modem does recognize the action name, it returns an OK result code. If the named action accepts one or more subparameters, the modem sends an information text response to the DTE, prior to the OK result code, specifying the values supported by the modem for each such subparameter, and possibly additional information. The format of this information text is defined for each action command.

2.4.4 Parameter Commands

Parameter Types
Parameters may be defined as "read-only" or "read-write". "Read-only" parameters are used to provide status or identifying information to the DTE, but cannot be set by the DTE; attempting to set their value is an error. In some cases (specified in the description of the individual parameter), the modem may ignore attempts to set the value of such parameters rather than respond with an ERROR result code, if the continued correct operation of the interface between the modem and DTE will not be affected by such action. Read-only parameters may be read and tested.
"Read-write" parameters may be set by the DTE, to store a value or values for later use. Read-write parameters may be set, read, and tested.
Parameters may take either a single value, or multiple (compound) values. Each value may be either numeric or string; the definition of the parameter will specify the type of value for each subparameter. Attempting to store a string value in a numeric parameter, or a numeric value in a string parameter, is an error.
2-6
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Parameter Set Command Syntax
The definition of the parameter indicates, for each value, whether the specification of that value is mandatory or optional. For optional values, the definition indicates the assumed (default) value if none is specified; the assumed value may be either a previous value (i.e., the value of an omitted subparameter retains its previous value), or a fixed value (e.g., the value of an omitted subparameter is assumed to be zero). Generally, the default value for numeric parameters is 0, and the default value for string parameters is "" (empty string).
The following syntax is used for parameters that accept a single value:
+<name>=[<value>]
The following syntax is used for parameters that accept more than one value:
+<name>=[<compound_value>]
For each implemented parameter, if all mandatory values are specified, and all values are valid according to the definition of the parameter, the specified values are stored. If <name> is not recognized, one or more mandatory values are omitted, or one or more values are of the wrong type or outside the permitted range, the modem issues the ERROR result code and terminates processing of the command line. An ERROR is also generated if too many values are specified. In case of an error, all previous values of the parameter are unaffected.
Parameter Read Command Syntax
The DTE may determine the current value or values stored in a parameter by using the following syntax:
+<name>?
The modem responds by sending the current values stored for the parameter to the DTE in an information text response. The format of this response is described in the definition of the parameter. Generally, the values are sent in the same form in which they would be issued by the DTE in a parameter setting command; if multiple values are supported, they will generally be separated by commas, as in a parameter setting command.
Parameter Test Command Syntax
The DTE may test if a parameter is implemented in the modem, and determine the supported values, by using the syntax:
+<name>=?
If the modem does not recognize the indicated name, it returns an ERROR result code and terminates processing of the command line. If the modem does recognize the parameter name, it returns an information text response to the DTE, followed by an OK result code. The information text response indicates the values supported by the modem for each such subparameter, and possibly additional information. The format of this information text is defined for each parameter.

2.4.5 Additional Syntax Rules

Concatenating Commands after Extended Syntax Commands
Additional commands may follow an extended-syntax command on the same command line if a semicolon (";") is inserted after the preceding extended command as a separator.
102184B Conexant 2-7
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
The semicolon is not necessary when the extended syntax command is the last command on the command line.
Concatenating Commands after Basic Format Commands
Extended syntax commands may appear on the same command line after a basic syntax command without a separator, in the same manner as concatenation of basic syntax commands.

2.5 Issuing Commands

All characters in a command line must be issued at the same data rate, and with the same parity and format.
The modem will ignore any command line that is not properly terminated. The modem may consider 30 seconds of mark idle time between any two characters as an improperly terminated command line. In this case the modem may or may not generate an ERROR message. The modem will ignore any characters received from the DTE that are not part of a properly-formatted command line.
If the maximum number of characters that the modem can accept in the body is exceeded, an ERROR result code is generated after the command line is terminated.
The DTE will not begin issuing a subsequent command line until at least one-tenth of a second has elapsed after receipt of the entire result code issued by the modem in response to the preceding command line.

2.6 Executing Commands

Upon receipt of the termination character, the modem commences execution of the commands in the command line in the order received from the DTE. Should execution of a command result in an error, or a character be not recognized as a valid command, execution is terminated, the remainder of the command line is ignored, and the ERROR result code is issued. Otherwise, if all commands execute correctly, only the result code associated with the last command is issued; result codes for preceding commands are suppressed. If no commands appear in the command line, the OK result code is issued.

2.6.1 Aborting Commands

Some action commands that require time to execute may be aborted while in progress; these are explicitly noted in the description of the command. Aborting of commands is accomplished by the transmission from the DTE to the modem of any character. A single character is sufficient to abort the command in progress; however, characters transmitted during the first 125 milliseconds after transmission of the termination character are ignored (to allow for the DTE to append additional control characters such as line feed after the command line termination character). To ensure that the aborting character is
recognized by the modem, it should be sent at the same rate as the preceding command line; the modem may ignore characters sent at other rates. When such an
aborting event is recognized by the modem, the modem terminates the command in progress and returns an appropriate result code to the DTE, as specified for the particular command.
2-8
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

2.6.2 Handling of Invalid Numbers and S-Parameter Values

The modem reacts to undefined numbers and S-parameter values in one of three ways:
1. Issue the ERROR result code, and leave the previous value of the parameter
unchanged;
2. Issue the OK result code, and leave the previous value of the parameter unchanged;
or,
3. Issue the OK result code, and set the parameter value to the valid value nearest to
that specified in the command line.
The description of each command specifies which of these three techniques is used to handle invalid parameter values for that command or parameter.

2.7 Modem Responses

While in command state and online command state, the modem will issue responses using the same rate, word length, and parity as the most recently received DTE command line. In the event that no DTE command has yet been received, rate, word length, and parity used will depend on the capabilities of the modem.
When the modem transitions from the command state or online command state to the online data state, the result code CONNECT should be issued at the bit rate and parity used during the command state. When the modem transitions from the online data state to the command state or online command state, the result codes should be issued at the bit rate used during the online data state. Thereafter, any unsolicited result codes should use the bit rate and parity of the last command line issued by the DTE to the modem.
The characters of a response will be contiguous, with no more than 100 milliseconds of mark idle issued between characters in addition to stop elements.

2.7.1 Responses

There are two types of responses that may be issued by the modem: information text and result codes.
Information Text. Information text responses consist of three parts: a header, information text, and a trailer:
1. The characters transmitted for the header are determined by the V command.
2. The trailer consists of two characters, being the character having the ordinal value of
3. Information text usually consists of a single line; information text returned in
Result Code Parts. Result codes consist of three parts: a header, the result text, and a
trailer.
1. The characters transmitted for the header and trailer are determined by the V
2. The result text may be transmitted as a number or as a string, also depending on a the
parameter S3 followed by the character having the ordinal value of parameter S4.
response to some commands may contain multiple lines, and the text may therefore include CR, LF, and other formatting characters to improve readability.
command setting.
V command setting.
102184B Conexant 2-9
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Result Code Types. There are three types of result codes: final, intermediate, and unsolicited. Result codes are described in Section 3.4.
1. A final result code indicates the completion of a full modem action and a ability to
accept new commands from the DTE.
2. An intermediate result code is a report of the progress of an modem action. The
CONNECT result code is an intermediate result code. In the case of a dialing or answering command, the modem switches from command state to online data state, and issues a CONNECT result code. This is an intermediate result code for the modem because it cannot accept commands from the DTE while in online data state. When the modem switches back to the command state it then issues a final result code (such as OK or NO CARRIER).
3. Unsolicited result codes (such as RING) indicate the occurrence of an event not
directly associated with the issuance of a command from the DTE.

2.7.2 Extended Syntax Result Codes

Extended syntax result codes may be issued in response to either basic or extended commands, or both. The appropriate responses are specified in the definitions of the commands, the responses, or both.
The general format of extended syntax result codes is the same as result codes defined in TIA-602 with regard to headers and trailers. The characters specified in S-parameters S3 and S4 are used in headers and trailers of extended syntax result codes as they are in basic format result codes. The setting of the V command affects the headers and trailers associated with extended syntax result codes in the same manner as basic format result codes; however, unlike basic format result codes, extended syntax result codes have no numeric equivalent, and are always issued in alphabetic form.
Extended syntax result codes are subject to suppression by the Q1 command, as with basic format result codes. The issuance of extended syntax result codes are not be affected by the setting of the X command.
Extended syntax result codes may be either final, intermediate, or unsolicited; the type being indicated in the definition of the result code.
Extended syntax result codes are prefixed by the "+" character to avoid duplication of basic format result codes specified in TIA-602. Following the "+" character, the name of the result code appears; result code names follow the same rules as command names.
Extended syntax result codes may include the reporting of values. The definition of the result code specifies whether or not values are appended to the result code, and, if so, how many, their types, and their assumed default values if omitted.
Data/voice Modes. When no values are to be reported, the result code appears in the simplest form:
+<name>
If a single value is to be reported, the form of the result code is:
+<name>: <value>
A single space character separates the colon character from the <value>; no space appears between the result code name and the colon. If multiple values are to be reported with the result code, the form is:
+<name>: <compound_value>
2-10
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Fax Modes. If a single value is to be reported, the form of the result code is:
<value> or (<value>)

2.7.3 +<name>: <compound_value>Information Text Formats for Test Commands

In general, the format of information text returned by extended syntax commands is described in the definition of the command.
The modem may insert intermediate <CR> characters in very long information text responses in order to avoid overrunning DTE receive buffers. If intermediate <CR> characters are included, the modem does not include the character sequences "0 <CR>"or "OK<CR>", so that DTE can avoid false detection of the end of these information text responses.
Range of Values
When the action accepts a single numeric subparameter, or the parameter accepts only one numeric value, the set of supported values may be presented in the information text as an ordered list of values. The list is preceded by a left parenthesis (() , and is followed by a right parenthesis ()). If only a single value is supported, it appears between the parentheses. If more than one value is supported, then the values may be listed individually, separated by comma characters, or, when a continuous range of values is supported, by the first value in the range, followed by a hyphen character (-), followed by the last value in the range. The specification of single values and ranges of values may be intermixed within a single information text. In all cases, the supported values are indicated in ascending order.
For example, the following are some examples of value range indications:
(0) Only the value 0 is supported.
(1,2,3) The values 1, 2, and 3 are supported.
(1-3) The values 1 through 3 are supported.
(0,4,5,6,9,11,12) The several listed values are supported.
(0,4-6,9,11-12) An alternative expression of the above list.
Compound Range of Values
When the action accepts more than one subparameter, or the parameter accepts more than one value, the set of supported values is presented as a list of the parenthetically-enclosed value range strings described above, separated by commas. For example, the information text in response to testing an action that accepts three subparameters, and supports various ranges for each of them, could appear as follows:
(0),(1-3),(0,4-6,9,11-12)
This indicates that the first subparameter accepts only the value 0, the second accepts any value from 1 through 3 inclusive, and the third subparameter accepts any of the values 0, 4, 5, 6, 9, 11, or 12.
102184B Conexant 2-11
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
This page is intentionally blank.
2-12
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3 Data Command Set

3.1 Command Guidelines

The commands used to control and report modem operation in data modem mode are defined in this section.
The Data Modem Mode commands and responses described in this section are applicable when command +FCLASS=0. (See Section 3.2.1 for the definition of the FCLASS command.)
The default values are typical of a fully configured modem supporting all data rates and options. The actual default value is dependent upon installed modem firmware and country specific parameters.
Commands are accepted by the modem once the previous command has been fully executed, which is normally indicated by the return of an appropriate result code. Execution of commands D and A, either as a result of a direct command or a re-execute command, will be aborted if another character is entered before completion of the handshake.

3.1.1 Escape Code Sequence

When the modem has established a connection and has entered on-line data mode, it is possible to break into the data transmission in order to issue further commands to the modem in an on-line command mode. This is achieved by the DTE sending to the modem a sequence of three ASCII characters specified by register S2. The default character is '+'. The maximum time allowed between receipt of the last character of the three escape character sequence from the DTE and sending of the OK result code to the DTE is controlled by the S12 register.

3.2 Data Commands

The modem will respond to the commands detailed below. Parameters applicable to each command are listed with the command description. The defaults shown for each configuration command are those used in the Conexant factory profile 0.
102184B Conexant 3-1
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3.2.1 Generic Modem Control

Z - Soft Reset and Restore Profile
This command causes the modem to perform a soft reset and restore (recall) the configuration profile. If no <value> is specified, zero is assumed.
Syntax
Z<value>
Defined Values
<value> Decimal number corresponding to the selected profile.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
0 Soft reset and restore stored profile 0.
1 Soft reset and restore stored profile 1.
+FCLASS - Select Active Service Class
This command selects the active service class (mode).
Syntax
+FCLASS=<mode>
Defined Values
<mode> Decimal number which corresponds to the selected service
class.
0 Select Data Mode (Section 3). (Default.)
1 Select Facsimile Class 1 Mode. (Section 4).
1.0 Select Facsimile Class 1.0 Mode. (Section 4).
8 Select Voice Mode. (Section 5).
10 Reserved.
Result Codes
OK For <mode> = 0, 1, 1.0, 8, and 10
ERROR Otherwise.
3-2
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Reporting Current or Selected Values
Command: +FCLASS?
Response: +FCLASS: <mode>
Example: +FCLASS: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +FCLASS=?
Response: +FCLASS: (<mode> range)
Example: +FCLASS: (0,1,1.0,8,10)
+VCID - Caller ID (CID)
This command controls the reporting and presentation of data associated with the Caller ID services in the Incoming Call Line ID (ICLID) data format for the next call.
Syntax
+VCID=<pmode>
Defined Values
<pmode> Decimal number corresponding to the selected option.
0 Disable Caller ID reporting. (Default.)
1 Enables Caller ID with formatted presentation to
the DTE. The modem presents the data items in a <Tag><Value> pair format. The expected pairs are date, time, name, and caller code (telephone number),
2 Enables Caller ID with unformatted presentation
to the DTE.
Reporting Current or Selected Values
Command: +VCID?
Response: +VCID: <pmode>
Example: +VCID: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +VCID=?
Response: +VCID: (<pmode> range)
Example: +VCID: (0-2)
102184B Conexant 3-3
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+VRID - Report Retrieved Caller ID (CID)
This command reports the data associated with the Caller ID services in the Incoming Call Line ID (ICLID) data format for the last received call.
Syntax
+VRID=<pmode>
Defined Values
<pmode> Decimal number corresponding to the selected option.
0 Reports Caller ID with formatted presentation to
the DTE. The modem presents the data items in a <Tag><Value> pair format. The expected pairs are date, time, name, and caller code (telephone number),
1 Reports Caller ID with unformatted presentation
to the DTE.
Reporting Supported Range of Parameter Values
Command: +VRID=?
Response: +VRID: (<pmode> range)
Example: +VRID: (0,1)
3-4
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
\N - Operating Mode
This command controls the preferred error correcting mode to be negotiated in a subsequent data connection. This command is affected by the OEM firmware configuration.
Syntax
\N<mode>
Defined Values
<mode> Decimal number which corresponds to the selected mode.
0 Selects normal speed buffered mode (disables
error-correction mode). (Forces &Q6.)
1 Serial interface selected - Selects direct mode
and is equivalent to &M0, &Q0 mode of operation. (Forces &Q0.)
Parallel interface selected - Same as \N0.
2 Selects reliable (error-correction) mode. The
modem will first attempt a LAPM connection and then an MNP connection. Failure to make a reliable connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=7.)
3 Selects auto reliable mode. This operates the
same as \N2 except failure to make a reliable connection results in the modem falling back to the speed buffered normal mode. (Forces &Q5, S36=7, and S48=7.)
4 Selects LAPM error-correction mode. Failure to
make an LAPM error-correction connection results in the modem hanging up. (Forces &Q5 and S48=0.) Note: The -K1 command can override the \N4 command.
5 Selects MNP error-correction mode. Failure to
make an MNP error-correction connection results in the modem hanging up. (Forces &Q5, S36=4, and S48=128.)
Result Codes
OK <mode> = 0 to 5.
ERROR Otherwise.
102184B Conexant 3-5
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
I - Identification
This command causes the modem to reports the requested result according to the command parameter.
Syntax
I<value>
Defined Values
<value> Decimal number corresponding to the selected information.
0 Reports product code, e.g., ā€œ56000ā€.
1 Reports the least significant byte of the stored
checksum in decimal. Reports 255 if the prestored checksum value is FFh.
2 Reports "OK".
3 Reports identification codes.
For the SmartACF and SCXXD, the codes are in
the form RevisionName-Modulation_Model, where:
RevisionName = product family name_firmware version, i.e., ACF3. The firmware version is in the form VX.XXX. Example: ACF3_V1.000
Modulation = V90, V34, or V32 for V.92/V.90, V.34, or V.32bis, respectively.
Model = Identifies RAM/ROM configuration.
For the SmartV.XX and SMXXD, the codes are
in the form RevisionName-Modulation, where:
RevisionName = masked firmware code version. Example: CX81801
Modulation = V90, V34, or V32 for V.90, V.34, or V.32bis, respectively.
Examples:
ACF3_V1.000-V90_P21_FSH
CX81801-V90
Note: If RPI+ is enabled (see +Hn),
ā€œROCKWELL RPI (TM) MODEM+01ā€ is appended.
3-6
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
4 Reports OEM defined identifier string in either
Hayes-compatible binary format (default) or ASCII format (selectable by ConfigurACE), e.g.:
a007040284C6002F
bC60000000 r1005111151012000 r3000111170000000
5 Reports Country Code parameter (see +GCI).
6 Reports modem data pump model and internal
code revision. Example: ā€œRCV56DPF-PLL L8773A Rev 62.01/62.01ā€.
7 Reports ā€œOKā€.
Result Codes
OK <value> = 0 - 7.
ERROR Otherwise.
+GMI - Request Manufacturer Identification
This command causes the modem to report the modem product manufacturer.
Syntax
+GMI
Typical Response
+GMI: CONEXANT OK
+GMI9 - Request Conexant Identification
This command causes the modem to report CONEXANT ACF identification. The response cannot be modified using ConfigurACE.
Syntax
+GMI9
Response
+GMI9: CONEXANT ACF OK
102184B Conexant 3-7
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+GMM - Request Model Identification
This command causes the modem to report the modem product.
Syntax
+GMM
Typical Response
+GMM: V90
+GMR - Request Revision Identification
This command causes the modem to report the modem version, revision level or date. This is the same as the I3 command.
Syntax
+GMR
Typical Response
+GMR: P2109-V90 OK
+GCAP - Request Complete Capabilities List
This extended-format command causes the modem to transmit one or more lines of information text listing additional capabilities command +<name>s , which is intended to permit the user to identify the overall capabilities of the modem. In particular, if the modem implements a particular modem control standard that uses Extended Syntax Commands, and if that modem control standard includes command(s) that indicate general capabilities, the +<names>(s) of those commands will be reported to the modem in response to a +GCAP command.
Syntax
+GCAP
Example Responses
+GCAP: +FCLASS, +MS, +ES, +DS,
for a data modem that supports all capabilities listed
Where:
+FCLASS T.class1, +F (Class 1 Facsimile modem Control)
+MS +M commands (Modulation Control: +MS and +MR
commands)
+ES +E commands (Error Control: +ES, +EB, +ER, +EFCS,
+ETBM)
+DS +D commands (Data Compression: +DS and +DR)
3-8
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+GCI - Country of Installation
This extended syntax command selects and indicates the country of installation for the modem. This parameter selects the settings for any operational parameters that need to be adjusted for national regulations or telephone networks.
Syntax
+GCI=<country_code>
Defined Values
<country_code> 8-bit country code from Annex A of T.35. The value is the
hexadecimal equivalent of the T.35 code, with bit 8 treated as the most significant bit and bit 1 treated as the least significant bit.
The supported countries are listed in the data sheet or in the
release notes for the applicable modem.
Default
If the modem is specified for use in only one country, that country code is the default. Otherwise, the default is defined by the OEM. Factory default is B5 (United States).
Reporting Current or Selected Values
Command: +GCI?
Response: +GCI: <current country_code>
Example: +GCI: 3D The modem is set for France.
Reporting Supported Range of Parameter Values
Command: +GCI=?
Response: +GCI: (<country_code>[,<country_code>[,<country_code].......]]
Example: +GCI: (00,B4,B5) The modem can be set for Japan, United
Kingdom, or the United States.
102184B Conexant 3-9
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&F - Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile). The factory defaults are identified for each command and in the S-Parameter descriptions. A configuration (profile) consists of a subset of S-Parameters.
Syntax
&F[<value>]
Defined Values
<value> Decimal number corresponding to the selected configuration.
0 Restore factory configuration 0.
1 Restore factory configuration 1.
Result Codes
OK
ERROR If the modem is connected.
&T - Local Analog Loopback Test
The modem will perform the local analog loopback test if &T1 is selected. The test can be run only when in an asynchronous operation in non-error-correction mode (normal), e.g., AT&Q6. To terminate the test in progress, the escape sequence must be entered first (see Section 3.1.1).
Syntax
&T[<value>]
Defined Values
<value> Decimal number corresponding to the selected option.
0 Terminates test in progress. Clears S16.
1 Initiates local analog loopback, V.54 Loop 3.
Sets S16 bit 0. If a connection exists when this command is issued, the modem hangs up. The CONNECT XXXX message is displayed upon the start of the test.
3-10
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&Y - Designate a Default Reset Profile
This command selects which user profile will be used after a hard reset.
Syntax
&Y<value>
Defined Values
<value> Decimal number corresponding to the selected profile.
0 The modem will use profile 0.
1 The modem will use profile 1.
Result Codes
OK <value> = 0 to 1.
ERROR If <value> > 1, or if NVRAM is not installed or is not
operational.
&W - Store Current Configuration
Saves the current (active) configuration (profile), including S-Parameters, in one of the two user profiles in NVRAM as denoted by the parameter value. This command will yield an ERROR message if the NVRAM is not installed or is not operational as detected by the NVRAM test.
The current configuration is comprised of a list of storable parameters illustrated in the &V command. These settings are restored to the active configuration upon receiving a Zn command or at power up (see &Yn command).
Syntax
&W<value>
Defined Values
<value> Decimal number corresponding to the selected profile.
0 Store the current configuration as profile 0.
1 Store the current configuration as profile 1.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
102184B Conexant 3-11
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&Zn=x - Store Telephone Number
The modem can store up to four telephone numbers and each telephone number dial string can contain up to 31 digits. (Requires 256-byte NVRAM installed.)
Syntax
&Z<value>
Defined Values
<value> Decimal number from 0 to 3 corresponding to the selected
telephone number.
<string> Dial string from 0 to 31 characters.
Result Codes
OK For <value> ≤ 3, and <string> ≤ 31 digits.
ERROR If <value> > 3, <string> > 31 digits, or if NVRAM is not
installed or is not operational.
%7 - Plug and Play Serial Number
Sets and stores eight serial numbers in hex format used for serial Plug and Play and for ISA Plug and Play which use the Conexant 11596 Plug and Play device. Applicable to Desktop configuration only.
Syntax
%7<8 hex numbers><same 8 hex numbers>
Example
%7<8 hex numbers><same 8 hex numbers>
Result Codes
OK <8 hex numbers><same 8 hex numbers>
ERROR Otherwise
To display the stored serial number, issue AT"?<cr>.
3-12
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
%8 - Plug and Play Vendor ID and Product Number
Sets and stores Vendor ID and product number for serial Plug and Play and for ISA Plug and Play which use the Conexant 11596 Plug and Play device. Applicable to Desktop configuration only.
Syntax
&8<3 ASCII characters><4 hex numbers><same 3 ASCII characters><same 4 hex numbers><cr>
Example
%8<3 ASCII characters><4 hex numbers><same 3 ASCII characters><same 4 hex numbers><cr>
Result Codes
OK <3 ASCII characters><4 hex numbers><same 3 ASCII
characters><same 4 hex numbers>
ERROR Otherwise
102184B Conexant 3-13
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
**- Load Flash Memory
The AT** command allows users to customize modem firmware by uploading flash memory firmware, NVRAM patch or internal SRAM patch.
Uploading flash memory firmware
The linear flash memory loader allows flash memory connected to the modem external memory bus to be upgraded with revised modem firmware. This process transfers the upgraded modem firmware from the host computer to the modem, which transfers the data to the flash memory device. Uploading new firmware to the flash memory or is a two-step process.
1. When the AT** command is issued, the modem firmware boot loader is invoked and
the user will first load a flash load module (FLM) into the modem's RAM. The data transfer is done via an ASCII transfer. The FLM contains the programming algorithm for the flash memory device being programmed and any messages that may be sent during the load process.
2. The user will then load the new modem firmware which the FLM will then program
into the flash memory device. This transfer is done via ASCII transfer.
Procedure
1. Install in the modem a flash memory programmed with the modem firmware or a
blank flash memory.
2. Put the FLM (e.g. F45Aload.S37) and the new modem firmware file (e.g.
ACF31900V90P21FSH282621p3v9.s37) in an appropriate directory on the computer's hard disk.
3. Configure the communications application program for a DTE rate of between 9600
bps and 115200 bps and RTS/CTS flow control. Note: When programming a blank or corrupt flash device the modem’s automatic speed sensing function does not operate and the modem defaults to 57600 bps.
4. Check the modem for response by typing AT.
5. Initiate the download process using the AT** command. The "Download flash
code…" message appears upon issuing the AT** command.
6. Perform an ASCII transfer of the FLM file (e.g., F45Aload.37) from the host
computer to the modem RAM using an industry standard communications software or an equivalent process (ensure that all ASCII translation or pacing is turned off).
7. After the FLM has been loaded perform an AASCI upload of the new modem
firmware hex file (e.g., ACF31900V90P21FSH282621p3v9.s37) from the host computer to the modem RAM using industry standard communications software or an equivalent process.
8. The messages described in Table 3-1 may occur during the uploading process:
3-14
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Table 3-1. Upload Messages
Message Description
Device not supported Displayed if the FLM used does not support the flash memory that
Wrong S37 format Displayed if the modem firmware being uploaded is not in Motorola
Record error Displayed if there is an error while either uploading or
Download abort Displayed if the transfer is aborted before it is finished. If this
Erase fail Displayed if the FLM is unable to erase the flash memory. If this
Download error, Re-Load Displayed if there was an error when uploading or downloading. If
Error, No H/W flow ctl Displayed if RTS-CTS flow control is not set. If this occurs, the
DTE timeout Displayed if the DTE has stopped the XMODEM transfer process
Code doesn’t match hardware
Device successfully programmed
is installed on the board.
S3 format.
downloading. If this occurs, the transfer should be aborted, and the user should restart at step 5.
occurs, the user should restart at step 5.
occurs, the user should restart at step 5.
this occurs, the user should restart at step 5.
user should restart at step 3.
before it is finished. If this occurs, the user should restart at step 5. Displayed if the user is attempting to upload a firmware that is not
the same model (parallel, serial, etc.), crystal frequency, or size (1Mbit, 2Mbit, etc.) as the firmware that is currently on the board. If this occurs, the FLM will abort and not allow the user to continue.
Displayed by the FLM at the completion of a successful upload or download then the modem will do a cold start.
The flash load module (FLM) has several built in safety mechanisms to reduce the risk of a failed flash upload/download. The FLM will not allow a user to upload a firmware of different model (serial, parallel, etc.) or crystal speed than what is currently in the flash memory. Also, it will not allow the user to upload a firmware that is larger in size than the flash memory itself (e.g., a 2Mbit firmware onto a 1Mbit flash memory). It will, however, allow the user to upload a firmware that is smaller in size than the flash memory, and it will program the firmware with the appropriate offset in order for the firmware to function properly. In the instance that there is a failure during the download or upload process, the modem will be in a ā€œflash rescue modeā€. In this mode, the modem will respond ā€œOKā€ to all AT commands, but will only take action on the AT** command, so a new attempt to upload or download can be initiated. When the modem is in the ā€œflash rescue modeā€ it will only be able to respond to AT commands if the DTE rate has not been changed since the last AT** command was successfully issued, even if the modem is powered off and on.
Uploading NVRAM patch
The NVRAM loader allows NVRAM connected to the modem serial EEPROM bus to be upgraded with custom patch code. This process transfers the modem patch code from the host computer to the modem, which transfers the data to the NVRAM device. Uploading an NVRAM patch to the NVRAM device is a two-step process.
1. When the AT** command is issued, the modem firmware boot loader is invoked and
the user will first load the NVRAM loader into the modem's RAM. The data transfer is done via an ASCII transfer. The NVRAM loader contains the programming algorithm for the NVRAM device being programmed.
2. The user will then load the NVRAM patch which the NVRAM loader will then
program into the NVRAM device. This transfer is done via ASCII transfer.
102184B Conexant 3-15
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Procedure
1. Put the NVRAM loader (e.g. NVM02-16.S37) and the NVRAM patch file (e.g.
PatchB3-05-00_NVM.S37) in an appropriate directory on the computer's hard disk.
2. Configure the communications application program for a DTE rate of between 9600
bps and 115200 bps and RTS/CTS flow control.
3. Check the modem for response by typing AT.
4. Initiate the download process using the AT** command. The "Download flash
code…" message appears upon issuing the AT** command.
5. Perform an ASCII transfer of the NVRAM loader file (e.g., NVM02-16.S37) from
the host computer to the modem RAM using an industry standard communications software or an equivalent process (ensure that all ASCII translation or pacing is turned off).
6. After the NVRAM loader has been loaded perform an AASCI transfer of the
NVRAM patch file (e.g., PatchB3-05-00_NVM.s37) from the host computer to the modem RAM using industry standard communications software or an equivalent process.
Uploading SRAM patch
An internal SRAM patch does not require a loader. The AT** command can be used to transfer the SRAM patch directly to the modem’s internal RAM. When the AT** command is issued, the modem firmware boot loader is invoked and the user will transfer the SRAM patch into the modem's RAM. The data transfer is done via an ASCII transfer.
Procedure
1. SRAM patch file (e.g. PatchB3-05-00_RAM.S37) in an appropriate directory on the
computer's hard disk.
2. Configure the communications application program for a DTE rate of between 9600
bps and 115200 bps and RTS/CTS flow control.
3. Check the modem for response by typing AT.
4. Initiate the download process using the AT** command. The "Download flash
code…" message appears upon issuing the AT** command.
5. Perform an AASCI transfer of the SRAM patch file (e.g., PatchB3-05-00_RAM.s37)
from the host computer to the modem RAM using industry standard communications software or an equivalent process.
3-16
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3.2.2 DTE-Modem Interface commands

The parameters defined in this section control the operation of the interface between the DTE and modem.
E - Command Echo
The modem enables or disables the echo of characters to the DTE. The parameter value, if valid, is written to S14 bit 1.
Syntax
E<value>
Defined Values
<value> Decimal number corresponding to the option.
Result Codes
0 Disables command echo.
1 Enables command echo. (Default.)
OK <value> = 0 or 1.
ERROR Otherwise.
Q - Quiet Results Codes Control
The command enables or disables the sending of result codes to the DTE. The parameter value, if valid, is written to S14 bit 2.
Syntax
Q<value>
Defined Values
<value> Decimal number corresponding to the option.
0 Enables result codes to the DTE. (Default.)
1 Disables result codes to the DTE.
Result Codes
OK <value>= 0 or 1.
ERROR Otherwise.
102184B Conexant 3-17
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
V - Result Code Form
This command selects the sending of short-form or long-form result codes to the DTE. The parameter, if valid, is written to S14 bit 3.
Syntax
V<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Enables short-form (terse) result codes. Line feed
is not issued before a short-form result code.
1 Enables long-form (verbose) result codes.
(Default.)
Result Codes
OK <value>= 0 or 1.
ERROR Otherwise.
W - Connect Message Control
This command, in conjunction with S95 bits 0, 2, 3, and 5 (bits 2, 3, and 5 can be written directly by the host or by the +MR, +ER, and +DR commands, respectively), control the format of CONNECT messages (see Section 3.4 and Table 3-16). The actual result code messages reported reflect the W command setting and the S95 bit settings. (Also see +MR, +ER, and +DR commands.)
The W parameter value, if valid, is written to S31 bits 2 and 3.
Syntax
W<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Upon connection, the modem reports only the
DTE speed (e.g., CONNECT 19200). Subsequent responses are disabled. (Default.)
1 Upon connection, the modem reports the
modulation, line speed, the error correction protocol, and the DTE speed, respectively. Subsequent responses are disabled.
2 Upon connection, the modem reports the DCE
speed (e.g., CONNECT 14400). Subsequent responses are disabled.
Result Codes
OK <value> = 0, 1, or 2.
ERROR Otherwise.
3-18
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
X - Extended Result Codes
This command selects the subset of the result code messages used by the modem to inform the DTE of the results of commands.
Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection, a "W" can be placed in the dial string (see D command). The information below is based upon the default implementation of the X results table. Table 3-2 indicates the messages which are enabled for each X value.
If the modem is in facsimile mode (+FCLASS=1 or 1.0), the only message sent to indicate a connection is CONNECT without a speed indication.
Syntax
X<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables reporting of busy tones unless forced
otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, and NO ANSWER result codes. Blind dialing is enabled/disabled by country parameters. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead of NO DIAL TONE. The value 000b is written to S22 bits 6, 5, and 4, respectively.
1 Disables reporting of busy tones unless forced
otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX (XXXX = rate). Blind dialing enabled/disabled by country parameters. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO CARRIER will be reported instead of NO DIAL TONE. The value 100b is written to S22 bits 6, 5, and 4, respectively.
2 Disables reporting of busy tones unless forced
otherwise by country requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIAL TONE, NO ANSWER, and CONNECT XXXX. If busy tone detection is enforced and busy tone is detected, NO CARRIER will be reported instead of BUSY. If dial tone detection is enforced or selected and dial tone is not detected, NO DIAL TONE will be reported instead of NO CARRIER. The value
102184B Conexant 3-19
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
101b is written to S22 bits 6, 5, and 4, respectively.
3 Enables reporting of busy tones; send only OK,
CONNECT, RING, NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX. Blind dialing is enabled/disabled by country parameters. If dial tone detection is enforced and dial tone is not detected, NO CARRIER will be reported. The value 110b is written to S22 bits 6, 5, and 4, respectively.
4 Enables reporting of busy tones; send all
messages. The value 111b is written to S22 bits 6, 5, and 4, respectively. (Default.)
Result Codes
OK <value> = 0 to 4.
ERROR Otherwise.
3-20
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Table 3-2. Result Codes
Short Form Long Form n Value in ATXn Command Notes
0 1 2 3 4
+F4 +FCERROR x x x x x
0 OK x x x x x 1 CONNECT x x x x x 2 RING x x x x x 3 NO CARRIER x x x x x 4 ERROR x x x x x 5 CONNECT 1200 1 x x x x 6 NO DIAL TONE 3 3 x x x 7 BUSY 3 3 3 x x 8 NO ANSWER x x x x x
9 CONNECT 600 1 x x x x 10 CONNECT 2400 1 x x x x 11 CONNECT 4800 1 x x x x 12 CONNECT 9600 1 x x x x 13 CONNECT 7200 1 x x x x 14 CONNECT 12000 1 x x x x 15 CONNECT 14400 1 x x x x 16 CONNECT 19200 1 x x x x 17 CONNECT 38400 1 x x x x 18 CONNECT 57600 1 x x x x 19 CONNECT 115200 1 x x x x 20 CONNECT 230400 x x x x x 22 CONNECT 75TX/1200RX 1 x x x x 23 CONNECT 1200TX/75RX 1 x x x x 24 DELAYED 4 4 4 4 x 25 MESSAGE-WAITING 32 BLACKLISTED 4 4 4 4 x 33 FAX x x x x x 35 DATA x x x x x 39 +MRR: 75 X X X X X 40 +MRR: 300 x x x x x 42 +MRR: 600 X X X X X 44 +MRR: 1200/75 x x x x x 45 +MRR: 75/1200 x x x x x 46 +MRR: 1200 x x x x x 47 +MRR: 2400 x x x x x 48 +MRR: 4800 x x x x x 49 +MRR: 7200 x x x x x 50 +MRR: 9600 x x x x x 51 +MRR: 12000 x x x x x 52 +MRR: 14400 x x x x x 53 +MRR: 16800 x x x x x Note 2 54 +MRR: 19200 x x x x x Note 2 55 +MRR: 21600 x x x x x Note 2 56 +MRR: 24000 x x x x x Note 2 57 +MRR: 26400 x x x x x Note 2 58 +MRR: 28800 x x x x x Note 2 59 CONNECT 16800 1 x x x x Note 2 61 CONNECT 21600 1 x x x x Note 2 62 CONNECT 24000 1 x x x x Note 2
102184B Conexant 3-21
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Short Form Long Form n Value in ATXn Command Notes
0 1 2 3 4
63 CONNECT 26400 1 x x x x Note 2 64 CONNECT 28800 1 x x x x Note 2 66 +DR: ALT x x x x x 67 +DR: V42B x x x x x 68 +DR: V44 X X X X X 69 +DR: NONE x x x x x 70 +ER: NONE x x x x x 77 +ER: LAPM x x x x x 78 +MRR: 31200 x x x x x Note 2 79 +MRR: 33600 x x x x x Note 2 80 +ER: ALT x x x x x 81 +ER: ALT-CELLULAR x x x x x 81 +ER: ALT - CELLULAR X X X X X 83 LINE IN USE X X X X X 84 CONNECT 33600 1 x x x x Note 2 85 OFF-HOOK INTRUSION X X X X X 86 LINE REVERSAL DETECTED X X X X X 87 NO LINE X X X X X 91 CONNECT 31200 1 x x x x Note 2
130 +ILRR 134 +MCR: B103 x x x x x 135 +MCR: B212 x x x x x 136 +MCR: V21 x x x x x 137 +MCR: V22 x x x x x 138 +MCR: V22B x x x x x 139 +MCR: V23 x x x x x 139 +MCR: V23C X X X X X 140 +MCR: V32 x x x x x 141 +MCR: V32B x x x x x 142 +MCR: V34 x x x x x Note 3 145 +MCR: V90 x x x x x Note 3 145 +MCR: V90 X X X X X 146 +MCR: V92 X X X X X 147 +MCR: V29 X X X X X 150 +MRR: 32000 x x x x x Note 3 151 +MRR: 34000 x x x x x Note 3 152 +MRR: 36000 x x x x x Note 3 153 +MRR: 38000 x x x x x Note 3 154 +MRR: 40000 x x x x x Note 3 155 +MRR: 42000 x x x x x Note 3 156 +MRR: 44000 x x x x x Note 3 157 +MRR: 46000 x x x x x Note 3 158 +MRR: 48000 x x x x x Note 3 159 +MRR: 50000 x x x x x Note 3 160 +MRR: 52000 x x x x x Note 3 161 +MRR: 54000 x x x x x Note 3 162 +MRR: 56000 x x x x x Note 3 165 CONNECT 32000 x x x x x Note 3 166 CONNECT 34000 x x x x x Note 3 167 CONNECT 36000 x x x x x Note 3 168 CONNECT 38000 x x x x x Note 3 169 CONNECT 40000 x x x x x Note 3 170 CONNECT 42000 x x x x x Note 3
3-22
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Short Form Long Form n Value in ATXn Command Notes
0 1 2 3 4
171 CONNECT 44000 x x x x x Note 3 172 CONNECT 46000 x x x x x Note 3 173 CONNECT 48000 x x x x x Note 3 174 CONNECT 50000 x x x x x Note 3 175 CONNECT 52000 x x x x x Note 3 176 CONNECT 54000 x x x x x Note 3 180 CONNECT 28000 x x x x x Note 3 181 CONNECT 29333 x x x x x Note 3 182 CONNECT 30667 x x x x x Note 3 183 CONNECT 33333 x x x x x Note 3 184 CONNECT 34667 x x x x x Note 3 185 CONNECT 37333 x x x x x Note 3 186 CONNECT 38667 x x x x x Note 3 187 CONNECT 41333 x x x x x Note 3 188 CONNECT 42667 x x x x x Note 3 189 CONNECT 45333 x x x x x Note 3 190 CONNECT 46667 x x x x x Note 3 191 CONNECT 49333 x x x x x Note 3 192 CONNECT 50667 x x x x x Note 3 193 CONNECT 53333 x x x x x Note 3 194 CONNECT 54667 x x x x x Note 3 195 +MRR: 28000 x x x x x Note 3 196 +MRR: 29333 x x x x x Note 3 197 +MRR: 30667 x x x x x Note 3 198 +MRR: 33333 x x x x x Note 3 199 +MRR: 34667 x x x x x Note 3 200 +MRR: 37333 x x x x x Note 3 201 +MRR: 38667 x x x x x Note 3 202 +MRR: 41333 x x x x x Note 3 203 +MRR: 42667 x x x x x Note 3 204 +MRR: 45333 x x x x x Note 3 205 +MRR: 46667 x x x x x Note 3 206 +MRR: 49333 x x x x x Note 3 207 +MRR: 50667 x x x x x Note 3 208 +MRR: 53333 x x x x x Note 3 209 +MRR: 54667 x x x x x Note 3 210 +MRR: 25333 X X X X X 211 +MRR: 26667 X X X X X 212 +MRR: 25333 X X X X X 213 +MRR: 22666 X X X X X 214 DIGITAL LINE DETECTED X X X X X
Notes:
1. An 'x' in a column indicates that the message (either the long form if verbose, or the value only for short form) will be generated when that particular value of 'n' (shown at the top of the column) has been selected by the use of ATXn. If the column is blank, then no message will be generated for that x option. A numeral indicates which less explicit message (verbose or short form) will be output for that X option. (Also, see Section 3.3).
2. V.34, V.90, and V.92 models only.
3. V.90 and V.92 models only.
102184B Conexant 3-23
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&C - RLSD (DCD) Option
The modem controls the RLSD output in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bit 5.
Syntax
&C<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 RLSD remains ON at all times.
1 RLSD follows the state of the carrier. (Default.)
Result Codes
OK 0 or 1.
ERROR Otherwise.
&D - DTR Option
This command interprets the ON to OFF transition of the DTR signal from the DTE in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bits 3 and 4. Also, see S25.
Syntax
&D<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 DTR drop is interpreted according to the current
&Qn setting as follows:
&Q0, &Q5, &Q6: DTR is ignored (assumed ON). Allows operation with DTEs which do not provide DTR.
&Q1: DTR drop causes the modem to hang up. Auto-answer is not affected.
&Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
3-24
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
1 DTR drop is interpreted according to the current
&Qn setting as follows:
&Q0, &Q1, &Q5, &Q6: DTR drop is interpreted by the modem as if the asynchronous escape sequence had been entered. The modem returns to asynchronous command state without disconnecting.
&Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
2 DTR drop is interpreted according to the current
&Qn setting as follows:
&Q0 through &Q6: DTR drop causes the modem to hang up. Auto-answer is inhibited. (Default.)
3 DTR drop is interpreted according to the current
&Qn setting as follows:
&Q0, &Q1, &Q5, &Q6: DTR drop causes the modem to perform a soft reset as if the Z command were received. The &Y setting determines which profile is loaded.
&Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
If &Q5, &Q6, or +FCLASS=1 is in effect, the action taken is the same as for &Q0.
&K - Flow Control
This command defines the DTE/DCE (terminal/modem) flow control mechanism. The parameter value, if valid, is written to S39 bits 0, 1, and 2.
Syntax
&K<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables flow control.
3 Enables RTS/CTS flow control. (Default for data
modem modes.)
4 Enables XON/XOFF flow control.
5 Enables transparent XON/XOFF flow control.
Note: Upon reset, both RTS/CTS and XON/XOFF flow control is enabled for fax modem and voice modes.
Result Codes
OK <value> = 0, 3, 4, or 5.
ERROR Otherwise.
102184B Conexant 3-25
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&M - Asynchronous/Synchronous Mode Selection
This command determines the DTR operating mode. The modem treats the &M command as a subset of the &Q command.
Syntax
&M<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects direct asynchronous operation. The
command sequence &M0\N0 selects normal buffered mode, but the command sequence \N0&M0 selects direct mode. This is because the \N0 command is analogous to the &Q6 command. The value 000b is written to S27 bits 3, 1, and 0, respectively. (See &Q).
1 Selects synchronous connect mode with async
off-line command mode. The value 001b is written to S27 bits 3, 1, and 0, respectively. (Serial interface operation only.)
2 Selects synchronous connect mode with async
off-line command mode. Same as &M1 except that &M2 enables DTR dialing of directory slot
0. The modem will disconnect if DTR is OFF for more than the period in S25 (in units of hundredths of a second): the data connection will be synchronous. The value 010b is written to S27 bits 3, 1, and 0, respectively. (Serial interface operation only.)
3 Selects synchronous connect mode. This mode
allows DTR to act as a talk/data switch. The call is manually initiated while DTR is inactive. When DTR becomes active, the handshake proceeds in originate or answer mode according to S14 bit 7. The value 011b is written to S27 bits 3, 1, and 0, respectively. (Serial interface operation only.)
Result Codes
OK <value> = 0 to 3
ERROR Otherwise.
3-26
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&Q - Sync/Async Mode
This command is an extension of the &M command and is used to control the connection modes permitted. It is used in conjunction with S36 and S48. (Also, see \N.)
NOTE: When the &Q0 to &Q3 command is issued to select the mode, the subsequent connect message will report the DCE speed regardless of the W command and S95 settings.
Syntax
&Q<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects direct asynchronous operation. The value
000b is written to S27 bits 3, 1, and 0, respectively. See &M0.
1 Selects synchronous connect mode with async
off-line command mode. The value 001b is written to S27 bits 3, 1, and 0, respectively. See &M1. (Serial interface operation only.)
2 Selects synchronous connect mode with async
off-line command mode and enables DTR dialing of directory 0. The value 010b is written to S27 bits 3, 1, and 0, respectively. See &M2. (Serial interface operation only.)
3 Selects synchronous connect mode with async
off-line command mode and enables DTR to act as Talk/Data switch. The value 011b is written to S27 bits 3, 1, and 0, respectively. See &M3. (Serial interface operation only.)
5 The modem will try to negotiate an error-
corrected link. The modem can be configured using S36 to determine whether a failure will result in the modem returning on-hook or will result in fallback to an asynchronous connection. The value 101b is written to S27 bits 3, 1, and 0, respectively. (Default.)
6 Selects asynchronous operation in normal mode
(speed buffering). The value 110b is written to S27 bits 3, 1, and 0, respectively.
Result Codes
OK <value> = 0 to 3, 5, or 6
ERROR Otherwise.
102184B Conexant 3-27
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&R - RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if hardware flow control is selected (see &K command). The parameter value, if valid, is written to S21 bit
2.
Syntax
&R<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 In sync mode, CTS tracks the state of RTS; the
RTS-to-CTS delay is defined by S26. In async mode, CTS is normally ON and will turn OFF only if required by flow control.
1 In sync mode, CTS is always ON (RTS
transitions are ignored). tracks the state of RTS; In async mode, CTS is normally ON and will turn OFF only if required by flow control.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
&S - DSR Override
This command selects how the modem will control DSR. The parameter value, if valid, is written to S21 bit 6.
Syntax
&S<value>
Defined Values
<value> Decimal number corresponding to the selected option.
&0 DSR will remain ON at all times. (Default.)
&1 DSR will become active after answer tone has
been detected and inactive after the carrier has been lost.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
3-28
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&X - Select Synchronous Clock Source
Selects the source of the transmit clock for the synchronous mode of operation. The parameter value, if valid, is written to S27 bits 4 and 5.
In asynchronous mode, the transmit and receive clocks are turned OFF. In synchronous mode, the clocks are turned ON with the frequency of 1200 Hz or faster corresponding to the speed that is selected for modem operation.
Syntax
&X<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects internal timing. The modem generates the
transmit clock signal and applies it to the TXCLK output at the serial interface.
1 Selects external timing. The local DTE sources
the transmit clock signal on the XTCLK input of the serial interface. The modem applies this clock to the TXCLK output at the serial interface.
2 Selects slave receive timing. The modem derives
the transmit clock signal from the incoming carrier and applies it to the TXCLK output at the serial interface.
Result Codes
OK <value> = 0 to 2.
ERROR Otherwise.
102184B Conexant 3-29
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+IPR - Fixed DTE Rate
This numeric extended-format parameter specifies the data rate at which the modem will accept commands during online operation. It may be used to select operation at rates at which the modem is not capable of automatically detecting the data rate being used by the DTE. Specifying a value of 0 disables the function and allows operation only at rates automatically detectable by the modem. The specified rate takes effect following the issuance of any result code(s) associated with the current command line.
The <rate> specified does not apply in OnLine Data State if Normal Mode (Direct Mode) of operation is selected.
Syntax
+IPR=<rate>
Defined Values
<rate> Specifies the DTE-modem interface operation rate in bits/s.
The available rates are: 0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400
If unspecified or set to 0, automatic detection is selected and
the character format is also forced to autodetect, +ICF=0.
If the rate specified is not supported by the modem, an
ERROR result code will be returned
Reporting Current or Selected Values
Command: +IPR?
Response: +IPR: <rate>
Example 1: +IPR: 0 For automatic rate detection.
Example 2: +IPR: 115200 For 115200 bps.
Reporting Supported Range of Parameter Values
Command: +IPR=?
Response: +IPR (<rate> range)
Example: +IPR: (0,300,1200,2400,4800,9600,19200,38400,57600,115200, 230400)
3-30
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+IFC - DTE-Modem Local Flow Control
This extended-format compound parameter controls the operation of local flow control between the DTE and the modem during the data state when V.42 error control is used, or when fallback to non-error control mode is specified to include buffering and flow control. It accepts two numeric subparameters.
Syntax
+IFC=[<modem_by_DTE>[,<DTE_by_modem>]]
Defined Values
<modem_by_DTE> Specifies the method to be used by the DTE to control the
flow of received data from the modem.
0 None.
1 XON/XOFF on transmitted data (XON/XOFF on
transmit data); do not pass XON/XOFF characters to the remote modem.
2 Circuit 133 (Ready for Receiving). (Default.)
3 DC1/DC3 on circuit 103 (Transmitted Data) with
DC1/DC3 characters being passed through to the remote DCE in addition to being acted upon for local flow control
<DTE_by_modem> Specifies the method to be used by the modem to control the
flow of transmitted data from the DTE.
0 None.
1 XON/XOFF on received data.
2 CTS/RTS. (Default.)
Reporting Current or Selected Values
Command: +IFC?
Response: +IFC: <modem_by_DTE>,<DTE_by_modem>
Example: +IFC: 2,2 For the defaults.
Reporting Supported Range of Parameter Values
Command: +IFC=?
Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range)
Example: +IFC: (0-3),(0-2)
102184B Conexant 3-31
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+ILRR - DTE-Modem Local Rate Reporting
This extended-format numeric parameter controls whether or not the extended-format +ILRR:<rate> information text is transmitted from the modem to the DTE.
Syntax
+ILRR=<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables reporting of local port rate (+ILRR: is
not transmitted). (Default.)
1 Enables reporting of local port rate (+ILRR: is
transmitted).
Reporting Current or Selected Values
Command: +ILRR?
Response: +ILRR: <current value>
Example: +ILRR: 0 For the default setting
Reporting Supported Range of Parameter Values
Command: +ILRR=?
Response: +ILRR: (<value> range)
Example: +ILRR: (0,1)
Reported Rate
The <rate> reported represents the current (negotiated or renegotiated) DTE-modem rate. If enabled, the intermediate result code is transmitted after any modulation, error control or data compression reports are transmitted, and before any final result code (e.g., CONNECT) is transmitted. The <rate> is applied after the final result code is transmitted.
The DTE-modem port rate will change only if neither buffered mode nor error controlled means are enabled (+ES=x,0) and if the negotiated carrier rate (+MRR) does not match the current DTE-modem port rate (autodetected from the previous command line).
Syntax
+ILRR: <rate>[,<rx_rate>]
3-32
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Defined Values
<rate> Decimal value representing the current (negotiated or
renegotiated) DTE-modem rate:
0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400
<rx_rate> Optional decimal value reporting the RXD rate, if it is
different from the TXD rate:
0, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, or 230400
Example
+ILRR: 19200
102184B Conexant 3-33
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+IBC – In Band Commands
This command provides a mechanism by which an in-band secondary channel may be implemented. This in-band secondary channel can be utilized to transparently exchange commands and responses to/from the modem during a data connection. This is an alternative approach to using the +++ escape sequence. The +IBC command also provides a mechanism to exchange V.24 signaling via the secondary channel. The primary reason the In Band Channel is implemented is to retrieve Caller ID type II information.
The supported In Band Channel command is compatible with the ITU-T V.80 standard but is not a full V.80 implementation. TheV.80 protocol supported is described below. Portions of the V.80 protocol not described are not supported. Please refer Section 7 of the ITU-T V.80 standard for more details.
Syntax
+IBC=<IB>,<105>,<106>,<107>,<108>,<109>,<110>,<125>,<132>,<133>,<135>, <142>,<hook>
Defined Values
<IB> Enables or disables in-band control sequence.
0 Disable in-band control sequences.
1 Enable 7-bit in-band control sequences. Ignore
eighth bit.
2 Enable 8-bit in-band control sequences.
<105> Enables or disables V.24 circuit type 105: RTS (Ready to Send).
0 Disable in-band reporting for this circuit.
1 Enable in-band reporting for this circuit.
<106> Enables or disables the circuit type 106: CTS (Clear to Send).
0 Disable in-band reporting for this circuit.
2 Enable in-band reporting for this circuit.
<125> Enables or disables the circuit type 125: RI (Ring Indicate).
0 Disable in-band reporting for this circuit.
1 Enable in-band reporting for this circuit.
<other> Not supported; leave ā€˜0’ for the unsupported circuit types.
<hook> Not supported; leave ā€˜0’.
Reporting Current or Selected Values
Command: +IBC?
Response: +IBC=<value>.<value>,<value>,0,0,0,0,<value>,0,0,0,0,0
Example: +IBC=0,0,0,0,0,0,0,0,0,0,0,0,0
Reporting Supported Range of Parameter Values
Command: +IBC=?
Response: +IBC: (0-2),(0-1),(0-1),0,0,0,0,(0-1),0,0,0,0,0)
3-34
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Entering and Exiting In Band Active State
In Band Command mode will be active only when a modem connection has been made and DCD is on and the modem is not in command mode. Upon a data connection before the connect message is sent, an In Band message will be sent to the DTE to notify that all further data will be EM shielded and should be filtered. Any other time (i.e., command mode or idle mode) the DTE should allow all user data to be in pass-through mode in which the data is unfiltered.
The DTE will receive one of the following active messages:
EM<60h><26h><62h>+IBC:1 to indicate In Band is active and the server is V.92
EM<60h><26h><62h>+IBC:2 to indicate In Band is active and the server is non-V.92
Upon Hang up or escape to command mode, the In Band command mode will end and the DTE should stop filtering EM data and return to pass-through mode.
The DTE will receive the following inactive In Band message:
EM<60h><26h><62h>+IBC:0 to indicate In Band is inactive
EM Shielding Data
When in-band control sequences are enabled, the DTE and the modem must shield and filter data containing EM. In V.80, in-band data is shielded from normal data by an EM character represented by a <19h> or <99h>. If the DTE’s data contains an EM, an additional character is inserted.
For example, sending <19h> from the DTE to the modem requires inserting a <singleEM> or <5Ch> into the data stream (e.g., <19h><5Ch>). The modem encodes this as one <19h> in the user data. On the other hand, sending <19h> from the modem to the DTE requires inserting a <singleEM> or <7Ch>. See Table 3-3. Please refer to the V.80 standard for more information.
Table 3-3. Supported V.80 Commands
Command Hex Codes Description
Supported V.80 DTE-to-DCE Commands
<extend0> <length> <control> <rest of command> <105off> <105on> <singleEMp> <doubleEMp> <singleEM> <doubleEM> <poll> <5Eh> The DCE decodes this command and deliver a set of status commands,
<extend0> <length> <status> <rest of command> <106off> <106on> <125off> <125on> <singleEMp> <doubleEMp> <singleEM> <doubleEM>
<40h> <42h> <42h> <43h> <58h>
<59h> <5Ch> <5Dh>
Supported V.80 DCE-to-DTE Commands
<60h> <62h> <62h> <63h> <6Ah> <6Bh> <76h> <77h> <7Ch> <7Dh>
The DCE decodes this as a sequence of 3 + (<length>-1Fh).
Circuit 105 is OFF. Circuit 105 is ON. The DCE decodes this as one <99h> in user data. The DCE decodes this as <99h><99h> in user data. The DCE decodes this as on <19h> in user data. The DCE decodes this as <19h><19h> in user data.
one for each circuit enabled.
The DCE decodes this as a sequence of 3 + (<length>-1Fh).
Circuit 106 is OFF. Circuit 106 is ON. Circuit 125 is OFF. Circuit 125 is ON. The DCE encodes this as one <99h> in user data. The DCE encodes this as <99h><99h> in user data. The DCE encodes this as on <19h> in user data. The DCE encodes this as <19h><19h> in user data.
102184B Conexant 3-35
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
In band processing of AT commands
When in-band control sequences are enabled, the modem responds to EM shielded AT commands via the extend-0 CONTROL sequence. This command may be used to transmit any AT commands to the modem as follows:
EM <extend-0> <length> <CONTROL> <AT Command without AT and trailing carriage return>
Upon receipt of an in-band command, the modem responds with the extend-0 STATUS REPORT sequence. This sequence will contain the response to the AT command issued via the CONTROL sequence with the trailing <cr> <lf> omitted:
EM <extend-0> <length> <STATUS> <AT Command response without trailing LF>
Example: Send +VRID=2 command to the modem and respond with terse caller ID:
EM <60h> <27h> <42h> +VRID=2
Note: <length> is 27h corresponding to 27h-1Fh=8. This is the length of the sequence following the <length> octet.
The modem responds to this command by transmitting the caller ID information to the DTE via the in-band sequence:
EM <60h> <length> <62h> <raw caller ID information>
EM<60h><22h><62h>OK
In this case, the <length> octet is the actual length of the raw caller ID + 1 + 1Fh.
In band signaling of CTS and Ring Indicate (Circuit 106 and Circuit 125)
Whenever the V.24 circuit selected via the +IBC command changes, the modem will send an unsolicited EM shielded frame to the DTE to inform the DTE of the new state. This is used for CTS and RI. For MOH applications, the DTE is specifically interested in circuit 125 (Ring Indicate).
When RI is asserted, the sequence EM <125on> or 19h 6Bh is sent to the DTE.
When RI is de-asserted, the sequence EM <125off> or 19h 6Ah is sent to the DTE.
3-36
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3.2.3 Call Control

D - Dial
This command directs the modem to go on-line, dial according to the string entered and attempt to establish a connection. If no dial string is supplied, the modem will go on-line and attempt the handshake in originate mode.
NOTE: If the ATD command is issued before the S1 register has cleared, the modem will respond with the NO CARRIER result code.
If +FCLASS=0 is selected, the modem will behave as a data modem and will attempt to connect to another data modem. The modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem will go on-hook with the NO CARRIER response. This command will be aborted in progress upon receipt of any DTE character before completion of the handshake.
If +FCLASS=1 or 1.0 is selected, the modem will behave as a facsimile modem and attempt to connect to a facsimile machine (or modem) by entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This command will be aborted upon receipt of any DTE character if the modem has not finished dialing. In this case, the modem will go on-hook and return to command mode after displaying the NO CARRIER message. If the modem has finished dialing, it proceeds as if the +FRH=3 command has been issued. (Refer to the +FRH command to determine how the modem behaves following this stage.)
Dial Modifiers
The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses, hyphen, and spaces being ignored.
Syntax
D<string>
102184B Conexant 3-37
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Defined Values
<string> Character string corresponding to the selected option(s).
0-9 DTMF digits 0 to 9.
* The 'star' digit (tone dialing only).
# The 'gate' digit (tone dialing only).
A-D DTMF digits A, B, C, and D. Some countries
may prohibit sending of these digits during dialing.
L Re-dial last number: the modem will re-dial the
last valid telephone number. The L must be immediately after the D with all the following characters ignored).
P Select pulse dialing: pulse dial the numbers that
follow until a "T" is encountered. Affects current and subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
T Select tone dialing: tone dial the numbers that
follow until a "P" is encountered. Affects current and subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
R This command will be accepted, but not acted
on.
S=n Dial the number stored in the directory (n = 0 to
3). (See &Z.)
! Flash: the modem will go on-hook for a time
defined by the value of S29. Country requirements may limit the time imposed.
W Wait for dial tone: the modem will wait for dial
tone before dialing the digits following "W". If dial tone is not detected within the time specified by S7 (US) or S6 (W-class), the modem will abort the rest of the sequence, return on-hook, and generate an error message.
@ Wait for silence: the modem will wait for at least
5 seconds of silence in the call progress frequency band before continuing with the next dial string parameter. If the modem does not detect these 5 seconds of silence before the expiration of the call abort timer (S7), the modem will terminate the call attempt with a NO ANSWER message. If busy detection is enabled, the modem may terminate the call with the BUSY result code. If answer tone arrives during execution of this parameter, the modem handshakes.
3-38
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
& Wait for credit card dialing tone before
continuing with the dial string. If the tone is not detected within the time specified by S7 (US models) or S6 (W-class models), the modem will abort the rest of the sequence, return on-hook, and generate an error message.
, Dial pause: the modem will pause for a time
specified by S8 before dialing the digits following ",".
; Return to command state. Added to the end of a
dial string, this causes the modem to return to the command state after it processes the portion of the dial string preceding the ";". This allows the user to issue additional AT commands while remaining off-hook. The additional AT commands may be placed in the original command line following the ";" and/or may be entered on subsequent command lines. The modem will enter call progress only after an additional dial command is issued without the ";" terminator. Use "H" to abort the dial in progress, and go back on-hook.
^ Toggles calling tone enable/disable: applicable to
current dial attempt only.
( ) Ignored: may be used to format the dial string.
- Ignored: may be used to format the dial string.
<space> Ignored: may be used to format the dial string.
<i> Invalid character: will be ignored.
> If enabled by country specific parameter, the
modem will generate a grounding pulse on the EARTH relay output.
102184B Conexant 3-39
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
T - Set Tone Dial Default
This command forces DTMF dialing until the next P dial modifier or P command is received. The modem will set an S-Parameter bit to indicate that all subsequent dialing should be conducted in tone mode. The DP command will override this command. Clears S14 bit 5.
This command may not be permitted in some countries. (See P.)
Result Code
OK
P - Set Pulse Dial Default
This command forces pulse dialing until the next T dial modifier or T command is received. Sets S14 bit 5.
As soon as a dial command is executed which explicitly specifies the dialing mode for that particular call (e.g., ATDT...), this command is overridden so that all future dialing will be tone dialed. (See T command.)
This command may not be permitted in some countries.
Result Code
OK
A - Answer
The modem will go off-hook and attempt to answer an incoming call if correct conditions are met. Upon successful completion of answer handshake, the modem will go on-line in answer mode. This command may be affected by the state of Line Current Sense, if enabled. (Most countries do not require Line Current Sense.) Operation is also dependent upon +FCLASS command and country-specific requirements.
If +FCLASS=0 is selected, the modem will enter the connect state after exchanging carrier with the remote modem. If no carrier is detected within a period specified in register S7, the modem hangs up. Any character entered during the connect sequence will abort the connection attempt.
If +FCLASS=1 or 1.0 is selected, the modem will go off-hook in V.21 answer mode. It will generate the V.21 2100 Hz answer tone for 3 ± 0.5 seconds and, following a delay of 70 ms, will proceed as if the +FTH=3 command were issued. At any stage up to (but excluding) the +FTH=3 command state, any character will abort the communication. (See the description of the +FTH command for details.)
3-40
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
H - Disconnect (Hang-Up)
This command initiates a hang up sequence.
This command may not be available for some countries due to PTT restrictions.
Syntax
H<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 The modem will release the line if the modem is
currently on-line, and will terminate any test (AT&T) that is in progress. Country specific, modulation specific, and error correction protocol specific (S38) processing is handled outside of the H0 command.
1 If on-hook, the modem will go off-hook and
enter command mode. For US models, the modem will remain off-hook. For W-class models, the modem will return on-hook after a period of time determined by S7.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
102184B Conexant 3-41
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
O - Return to On-Line Data Mode
This command determines how the modem will enter the on-line data mode. If in the onĀ­line command mode, the modem enters the on-line data mode with or without a retrain. If in the off-line command mode (no connection), the modem reports ERROR.
Syntax
O<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Enters on-line data mode without a retrain.
Handling is determined by the Call Establishment task. Generally, if a connection exists, this command connects the DTE back to the remote modem after an escape (+++).
1 Enters on-line data mode with a retrain before
returning to on-line data mode.
2 Fast retrain without speed change (used for
diagnostic purpose only).
3 Renegotiate rate without speed change (used for
diagnostic purpose only.
4 Renegotiate rate down one speed (used for
diagnostic purpose only).
5 Renegotiate rate up one speed (used for
diagnostic purpose only).
Result Codes
OK <value> = 0 to 5 and a connection exists.
ERROR Otherwise or if not connected.
3-42
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
L - Speaker Volume
This command sets the speaker volume control. The parameter value, if valid, is written to S22 bits 0 and 1.
Syntax
L<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Low volume.
1 Low volume. (Default.)
2 Medium volume.
3 High volume.
Result Codes
OK <value> = 0 to 3.
ERROR Otherwise.
M - Speaker Control
This command selects when the speaker will be on or off. The parameter value, if valid, is written to S22 bits 2 and 3.
Syntax
M<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Speaker is always off.
1 Speaker is on during call establishment, but off
when receiving carrier. (Default.)
2 Speaker is always on.
3 Speaker is off when receiving carrier and during
dialing, but on during answering.
Result Codes
OK <value> = 0 to 3.
ERROR Otherwise.
102184B Conexant 3-43
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&G - Select Guard Tone
This command causes the modem to generate the guard tone selected by this command (DPSK modulation modes only). The parameter value, if valid, is written to S23 bits 6 and 7.
Syntax
&G<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables guard tone. (Default.)
1 Disables guard tone.
2 Selects 1800 Hz guard tone.
This command may not be permitted in some countries.
Result Codes
OK <value> = 0 to 2.
ERROR Otherwise.
&P - Select Pulse Dial Make/Break Ratio
This command determines the make/break ratio used during pulse dialing. It is only effective if the appropriate bit to enable this command is set through the ConfigurACE program. If enabled, it will override the make/break ratios in the OEM parameters in ConfigurACE. The default is country-dependent. The parameter value, if valid, is written to S28 bits 3 and 4.
Syntax
&P<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects 39%-61% make/break ratio at 10 pulses
per second. (Default.)
1 Selects 33%-67% make/break ratio at 10 pulses
per second.
2 Selects 39%-61% make/break ratio at 20 pulses
per second.
3 Selects 33%-67% make/break ratio at 20 pulses
per second.
Result Codes
OK <value> = 0 to 3.
ERROR Otherwise.
3-44
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&V - Display Current Configuration and Stored Profiles
This command reports the current (active) configuration, the stored (user) profiles, and the first four stored telephone numbers. The stored profiles and telephone numbers are not displayed if the NVRAM is not installed or is not operational as detected by the NVRAM test during reset processing.
Result Code
OK
Example:
AT&V ACTIVE PROFILE: B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S38:020 S46:138 S48:007 S95:000
STORED PROFILE 0: B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007 S40:104 S41:195 S46:138 S95:000
STORED PROFILE 1: B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5 &R1 &S0 &T5 &X0 S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007 S40:168 S41:195 S46:138 S95:000
TELEPHONE NUMBERS: 0 = 1 = 2 = 3 =
OK
102184B Conexant 3-45
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
&V1 - Display Last Connection Statistics
Displays the last connection statistics in the following format (shown with typical results):
TERMINATION REASON.......... LOCAL REQUEST
LAST TX rate................ 26400 BPS
HIGHEST TX rate............. 26400 BPS
LAST RX rate................ 49333 BPS
HIGHEST RX rate............. 49333 BPS
PROTOCOL.................... LAPM
COMPRESSION................. V42Bis
Line QUALITY................ 038
Rx LEVEL.................... 015
Highest Rx State............ 67
Highest TX State............ 67
EQM Sum..................... 00B4
Min Distance................ 0000
RBS Pattern................. 00
Rate Drop................... 00
Digital Loss................ 2000
Local Rtrn Count............ 00
Remote Rtrn Count........... 00
Flex 9481814347C4
RBS Pattern: Shows which bits are being robbed in the least significant 6 bytes, e.g., 03 indicates 2 robbed bits in bit positions 0 and 1.
Digital Loss: Shows if a pad was encountered and if so, what was the digital loss. 2000 means 0dB.
Flex: Shows V.8bis information as follows:
First byte: Octet 13 (second byte of manufacturer id, 94 = K56flex)
Second byte: Octet 14 (Licensee code: 81 = Conexant)
Third byte: Octet 15 (manufacturer's product capabilities)
Fourth byte: Octet 16 (K56flex version number)
Fifth byte: Octet 17 (Conexant pump code version number)
Sixth byte: Octet 18 (x-law and controller version number)
Bit 6 Forced/Not forced A-Law/µ-Law
0 = Forced A-Law/µ-Law. 1 = Not forced A-Law/µ-Law.
Bit 5 Select A-Law or µ-Law
0 = Select A-Law. 1 = Select µ-Law.
Bit 4:0 Controller version
3-46
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
\V - Single Line Connect Message Enable
This command enables or disables the single line connect message format as follows:
Syntax
\V<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Connect messages are controlled by the
command settings X, W, and S95.
1 Connect messages are displayed in the single
line format described below subject to the command settings V (Verbose) and Q (Quiet). In Non-Verbose mode (V0), single line connect messages are disabled and a single numeric result code is generated for CONNECT DTE.
When single line connect messages are enabled, there are no CARRIER, PROTOCOL (+ER:), or COMPRESSION (+DR:) messages apart from the fields described below.
The single line connect message format is:
CONNECT <DTE Speed>/<Modulation>/<Protocol>/<Compression>/ <Line Speed>
Where:
DTE Speed = DTE speed, e.g., 57600.
Modulation = ā€œV92ā€ for V.92 modulation.
ā€œV90ā€ for V.90 modulation. ā€œV34ā€ for V.34 modulation. ā€œV32ā€ for V.32 or V.32bis modulation.
Note: Modulation is omitted for all other modulations.
Protocol = ā€œNONEā€ for no protocol.
ā€œALTā€ for Microcom Network Protocol. ā€œLAPMā€ for LAP-M protocol.
Compression = ā€œV44ā€ for V.44 compression.
ā€œV42Bā€ for V.42bis compression. ā€œALTā€ for Microcom MNP5 compression.
Note: Compression is omitted if protocol is NONE.
Line Speed = Asymmetric rates are displayed as ā€œ/rate:TX/rate:RXā€, e.g.,
/1200 TX/75 RX. Symmetric rates are displayed as a single DCE rate, e.g.,
14400.
102184B Conexant 3-47
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
%L - Report Line Signal Level
Returns a value which indicates the received signal level. The value returned is a direct indication (DAA dependent) of the receive level at the MDP, not at the telephone line connector. For example, 009 = -9 dBm, 043 = -43 dBm, and so on.
Result Codes
OK
%Q - Report Line Signal Quality
Reports the line signal quality (DAA dependent). Returns the higher order byte of the EQM value. Based on the EQM value, retrain or fallback/fall forward may be initiated if enabled by %E1 or %E2.
Example:
AT%Q
015
Result Codes
OK If connected.
ERROR If not connected, or connected in 300 bps, V.23, or fax modes.
*B - Display Blacklisted Numbers
This command requests the modem to return a list of blacklisted numbers to the DTE. The format of the response is shown by the example below. Permanently forbidden numbers as defined by country requirements will not appear on this list. If no numbers are blacklisted, only the OK result code is issued.
Syntax
*B
Example
NO. - PHONE NUMBER -
------ ------------------------------
1; 4175537660 2; 8288924961 3; 3887278862 4; 3124839442 5; 6284664
OK
3-48
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
*D - Display Delayed Numbers
This command causes the modem to send a list of the delayed numbers together with the delay associated with each. The modem will return a list of delayed telephone numbers as defined in the *B command. The format of the response is shown by the example below (delay times are shown as hours:minutes:seconds). If no numbers are delayed, only the OK result code is issued.
Syntax
*D
Example
NO. - PHONE NUMBER -DELAY
------ -------------------------------------------
1; 8264734660 2:00:00 2; 7532634661 2:00:00 3; 2587334662 0:02:00 4; 7532651663 0:03:25 5; 7459931664 0:01:45
OK
–PPD= - Extension Pickup Notification through 16550 UART
The –PPD=1 command allows setting of the DDSR (bit 1 of register 6) when an extension pick-up is detected, and disables all DSR notification. The –PPD=0 command disables this feature.
This feature is available only on a SmartSCM that is configured for parallel operation.
102184B Conexant 3-49
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
–STE= - Set Telephony Extension
The –STE command enables/disables Line In Use, Extension Pickup, and Remote Hangup detection features.
Note: Additional hardware may be required to support these features.
Syntax
-STE=<value>
Defined Values
<value> Decimal number corresponding to the selected bit-mapped
options. The bit fields are defined as follows:
Bit 0 Line In Use detection enable/disable.
Bit 1 Extension Pickup detection enable/disable.
Bit 2 Remote Hangup detection enable/disable.
<value>
(Dec.)
0 (default) Disabled Disabled Disabled
1 Disabled Disabled Enabled 2 Disabled Enabled Disabled 3 Disabled Enabled Enabled 4 Enabled Disabled Disabled 5 Enabled Disabled Enabled 6 Enabled Enabled Disabled 7 Enabled Enabled Enabled
Remote Hangup
Extension
Pickup
Line In Use
Reporting Current or Selected Values
Command: -STE?
Response: -STE: <value>
Example: -STE: 4 Remote Hangup enabled, Extension
Pickup disabled, and Line In Use disabled.
Reporting Supported Range of Parameter Values
Command: -STE=? Show available options.
Response: -STE: 0-7
Result Codes
OK <value> = 0-7
ERROR Otherwise.
3-50
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Behavior in Data Mode (+FCLASS=0)
When on-hook, if the line is in use and an ATDT is issued, the modem will not go offĀ­hook and will return with the message LINE IN USE.
When off-hook and either an extension is picked up or a line reversal is detected, the modem will drop the connection. The disconnect reason in register S86=25 (this is also defined for #UD). The user must flash the hook in order to get a dial tone due because the remote server will be retraining.
If the local handset is picked up while the modem is off-hook, the modem will do a linkĀ­disconnect, flash the hook for 1.5 seconds, then connect the local handset to the line. At this point, the user dial tone should be on the local handset. The disconnect reason in S86=25.
Behavior in Voice Mode (+FCLASS=8)
When in voice mode and an extension is picked-up, a <DLE>P is sent to the DTE. When the modem is off-hook , a line reversal may also be detected in which case a <DLE>l is sent to the DTE.
In voice mode, there is no blocking of ATDT when the line is in use. Also, there is no automatic hang-up in voice mode as in data mode. There is only the above stated <DLE> shielding event reporting.
Operation in Data Mode
Line In Use (Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7)
Case 1: Telephone Line is in Use
If an ATDT, ATDP or ATDL is issued while Line In Use detection is enabled and the telephone line is in use, the modem will immediately return the message LINE IN USE to the DTE without going off-hook, and then return to command mode.
Case 2: Telephone Line is in Use But Disconnected
If an ATDT, ATDP or ATDL is issued while Line In Use detection is enabled and the telephone line is NOT in use, the modem will go off-hook after a short pause, then respond with CONNECT or NO CARRIER message.
Case 3: Telephone Line is Not Connected to Modem
If an ATDT, ATDP or ATDL is issued while Line In Use detection is enabled and the telephone line is not connected, the modem will go off-hook momentarily, go back onĀ­hook, then respond with NO LINE message.
Extension Pick-up (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):
Case 1: Modem off-hook, Local Handset Goes Off-Hook
If the local handset goes off-hook while the modem is in a data connection, the local handset will be muted. The modem will then send a GSTN Cleardown to the remote modem and then go on-hook. The modem will then send an OFF HOOK INTRUSION message to the DTE. A result code of 25 will be left in S86 register. After 2 seconds, the local handset will be connected to the telephone line so the user hears the dial tone.
102184B Conexant 3-51
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Case 2: Modem off-hook, Extension Pick-up
If the modem is connected and another extension goes off-hook, the modem will send a GSTN Cleardown to the remote modem and then immediately hang-up. Due to the noise possibly being added to the line when a telephone extension is picked-up, a GSTN Cleardown may or may not successfully be received by the remote mode. If the GSTN Cleardown is not received successfully by the remote modem, the remote modem may attempt a retrain until the retrain fails and the remote modem drops the line. In any case, the modem will send an OFF HOOK INTRUSION message to the DTE immediately after sending the GSTN Cleardown. A result code of 25 will be left in the S86 register.
Because the extension is off-hook, the modem cannot flash the hook for the central office to generate a dial tone. In this case, the user must flash the extension handset to obtain a dial tone.
Remote Hang-up (enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7):
Case 1: Modem off-hook, Remote Hang-up
If the modem is connected (off-hook) and the remote modem/server goes hangs up, the central office may issue a line polarity reversal. If a line polarity reversal is detected, the modem will drop the call and respond with NO LINE REVERSAL DETECTED. The reason for hang-up can be determined by #UD or by S86=25. A line reversal can also be simulated by simply pulling out the telephone line during a connection.
Operation in Voice Mode
Line In Use (enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7):
This feature does not apply in voice mode.
Extension Pickup (Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7)
If the modem is off-hook and an extension goes off-hook, the modem issues a <DLE>P to the DTE. The application software should then hang up the line (VLS=0).
Remote Hang-up (Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7)
If the modem is off-hook and the remote user goes on-hook, the modem issues a <DLE>P to the DTE. The application software should then hang up the line (VLS=0).
Examples
User is talking on an extension and the modem tries to dial
AT-STE=7
ATDT555-1212
LINE IN USE
3-52
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
The line is not in use and the modem tries to dial
AT-STE=7
ATDT555-1212
Modem goes off-hook
CONNECT
An extension is off-hook but there is silence on the line and the modem tries to dial
AT-STE=3
ATDT555-1212
Modem goes off-hook
NO LINE
Modem is connected in data mode and an extension goes off-hook
AT-STE=2
ATDT555-1212
CONNECT
OFF HOOK INTRUSION Extension is picked up, GSTN Cleardown sent
ATS86=?
025
Modem is connected in data mode and remote modem goes on-hook
AT-STE=4
ATDT555-1212
CONNECT
OFF HOOK INTRUSION Remote modem drops line
ATS86=?
025
102184B Conexant 3-53
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Modem is connected in data mode and the LOCAL HANDSET goes off-hook
AT-STE=7
ATDT555-1212 5 sec delay
CONNECT
LINE REVERSAL DETECTED Local handset goes off-hook, GSTN Cleardown sent, and remote modem goes on-hook
ATS86=?
025
500 ms after no carrier a dial tone is heard on the local handset
Modem is in answer machine mode and an extension goes off-hook
AT-STE=2
AT+FCLASS=8
OK
<DLE>h Local handset on-hook
<DLE>R Ring
AT+VLS=1
OK
AT+VSM=1,7200,0,0
AT+VTX Starts to play greeting message
<DLE>P User picks up extension
<DLE>! DTE send abort to end playback
AT+VLS=0 DTE hangs up
3-54
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Automated system that needs to periodically use the line while giving the voice user the highest priority
A common use for these features would be an automated system that needs to periodically use the line while giving the voice user the highest priority.
The automated system would make a connection when the line is free. It would do this without disturbing the line if the line is in use. The automated system would periodically retry the connection until the line is free. Once the line is free it would dial and make its connection. If a voice user wishes to use the line while the modem is connected. The modem will drop the line and give the line to the user. The modem will then try to regain control of the line by once again periodically retrying to establish a connection.
AT-STE=7
OK
ATDT5551212
CONNECT
Sometime later, the user picks up phone
NO CARRIER
ATS86?
25
OK
Delay 30 seconds
ATDT5551212
LINE IN USE
Try again some time later user hangs up the phone
CONNECT
-TRV – Tip & Ring Voltage
This command allows the host to read the voltage that the modem sees across Tip & Ring.
Syntax
-TRV
Example
Command: AT-TRV
Response: 1.4
Note: The voltage measurement is read on the opposite of the diode bridge, so the modem assumes and compensates for the voltage drop across 2 diodes. Therefore, if no line is connected, the modem will report 1.4V.
102184B Conexant 3-55
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
-TTE - Threshold Adjustments for Telephony Extension
This command allows the host to set/tune the telephone extension features for the modem to determine Line In Use, Extension Pickup, Remote Hang-up, and Digital Line Protection and Line Interruption Immunity conditions. An ATZ or AT&F will load default values.
Syntax
-TTE=<Line In Use voltage drop threshold>, <Extension Pickup voltage drop threshold>, <Remote Hang-up voltage drop threshold>, <Digital Line Protection current threshold >, <Line Interruption Immunity >,<RESERVED>
1
Range: (0-9999)
Units: 1/10 volt (first three parameters), 1 mA (fourth parameter), 100 ms (fifth
parameter)
Defined Values
<Line In Use voltage drop threshold>
1000 = 10.00 V drop while modem is on-hook. (Default.)
<Extension Pickup voltage drop threshold>
150 = 1.50 V drop while modem is off-hook; this value must
<Remote Hang-up voltage drop threshold>
500 = 5.00 V drop while modem is off-hook; this value must
<Digital Line Protection current threshold>
160 = 160 mA while modem is off-hook (Default.):
<Line Interruption Immunity>
0 = 200 ms (Default.)
1 = 200 ms
2 = 200 ms
n (where n > 2) = n*100 ms
<RESERVED> 056 (Default.)
, (0-9999) 1, (0-9999) 1, (0-9999), (0-255), (0-255)
1
1
be less than the Remote Hang-up voltage drop threshold. (Default.)
1, 2
be greater than the Extension Pickup voltage drop threshold. (Default.)
Reporting Current or Selected Value
Command: AT-TTE? Queries current setting
Notes:
1. Thresholds are difference thresholds. Example: The line would be considered ā€œin useā€ if the Tip & Ring voltage dropped by 10.00 V. Another Example: If the modem is off-hook and the voltage drops by more than 2.50 V, then the modem would consider the condition as an extension pickup.
2. The <Remote Hang-up voltage drop threshold> must always be less than the <Extension Pickup voltage drop threshold). Otherwise, the extension pickup will not function.
3-56
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3.2.4 Modulation Control Commands

+MS - Modulation Selection
This extended-format compound parameter controls the manner of operation of the modulation capabilities in the modem. It accepts six subparameters.
Syntax
+MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate>[,<min_rx_rate> [,<max_rx_rate>]]]]]]
Where possible <carrier>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate>, and <max_rx_rate> values are listed in Table 3-4.
Table 3-4. +MS Command Supported Rates
Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>),
Bell 103 B103 300 Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx V.21 V21 300 V.22 V22 1200 V.22 bis V22B 2400 or 1200 V.23 V23C 1200 V.32 V32 9600 or 4800 V.32 bis V32B 14400, 12000, 9600, 7200, or 4800 V.34 V34 33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
V.90 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000
V.92 downstream V92 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000
V.92 upstream V92 48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000, 26667, 25333, 24000
and <max_tx_rate>) Rates (bps)
102184B Conexant 3-57
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Defined Values
<carrier> A string which specifies the preferred modem carrier to use in
originating or answering a connection. <carrier> values are strings of up to eight characters, consisting only of numeric digits and upper case letters. <carrier> values for ITU standard modulations take the form: <letter><1-4 digits><other letters as needed>. Defined values are listed in Table 3-4.
<automode> A numeric value which enables or disables automatic
modulation negotiation (e.g., ITU-T V.32bis Annex A or V.8).
0 = Automode disabled.
1 = Automode enabled. (Default.)
<min_rx_rate> and <max_rx_rate>
Numeric values which specify the lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate at which the modem may establish a receive connection. May be used to condition distinct limits for the receive direction as distinct from the transmit direction. Values for this subparameter are decimal encoded, in units of bit/s. The possible values for each modulation are listed in Table 3-4. Actual values will be limited to possible values corresponding to the entered <carrier> and fall-back <carrier> as determined during operation. (Default = lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate supported by the selected carrier.)
<min_tx_rate> and <max_tx_rate>
Numeric values which specify the lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate at which the modem may establish a transmit connection. Non-zero values for this subparameter are decimal encoded, in units of bit/s. The possible values for each modulation are listed in Table 3-4. Actual values will be limited to possible values corresponding to the entered <carrier> and fall-back <carrier> as determined during operation. (Default = lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate supported by the selected carrier.)
3-58
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Reporting Current or Selected Values
Command: +MS?
Response: +MS:<carrier>,<automode>,<min_tx_rate>, <max_tx_rate>,
<min_rx_rate>,<max_rx_rate>
Note: The current active settings are reported under control of the +MR parameter.
Example: +MS: V92, 1,300,48000,300,56000
For default values. This example allows maximum system flexibility to determine optimal receive and transmit rates during operation.
Reporting Supported Range of Parameter Values
Command: +MS=?
Response: +MS: (< carrier> range),(<automode> range),(<min_tx_rate> range),
(<max_tx_rate> range), (<min_rx_rate> range), (<max_rx_rate> range)
Example: +MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,
V90,V92),(0,1),(300-33600),(300-48000),(300-56000),(300-56000)
Result Code
OK Valid subparameter string
ERROR Otherwise.
+MR - Modulation Reporting Control
This extended-format numeric parameter controls whether or not the extended-format +MCR:<carrier> and +MRR:<rate> intermediate result codes are transmitted from the modem to the DTE. If enabled, +MCR:<carrier> and +MRR:<rate> intermediate result codes represent the current (negotiated or renegotiated) modulation <carrier> and <rate> that are transmitted at the point during connect negotiation (handshaking) at which the modem has determined which modulation and rate will be used, i.e., before any Error Control or Data Compression reports are transmitted, and before any final result code (e.g., CONNECT) is transmitted.
S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2. The more recent setting of +MR or S95 bit 2, and the W command setting, determines modulation result code reporting (see S95 Parameter and W Command).
Syntax
+MR=[<value>]
102184B Conexant 3-59
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Defined Values
<value> A decimal number corresponding to the selected option:
0 Disables reporting of modulation connection
(+MCR: and +MRR: are not transmitted). (Default.)
1 Enables reporting of modulation connection
(+MCR: and +MRR: are transmitted with tx rate, rx rate).
2 Enables reporting of modulation connection
(+MCR: and +MRR: are transmitted with rx rate only).
Reporting Current or Selected Values
Command: +MR?
Response: +MR: <current value>
Example: +MR: 0 For default setting
Reporting Supported Range of Parameter Values
Command: +MR=?
Response: +MR: (<value>range)
Example: +MR: (0-2)
+MCR: Report Syntax
Response: +MCR: <carrier>
<carrier> Alphanumeric code corresponding to the reported carrier.
Defined values are:
B103 For Bell 103
B212 For Bell 212
V21 For V.21
V22 For V.22
V22B For V.22bis
V23C For V.23
V32 For V.32
V32B For V.32bis
V34 For V.34
V90 For V.90
V92 For V.92
3-60
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+MRR: Report Syntax
Response: +MRR: <tx_rate>,<rx_rate>
<tx_rate> Decimal transmit rate in bits/s.
<rx_rate> Decimal receive rate in bits/s.
Example: +MRR: 28800, 48000
%E - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward
Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1) or fall back when line quality is insufficient or fall forward when line quality is sufficient (%E2). The parameter value, if valid, is written to S41 bits 2 and
6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
Syntax
%E<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disable line quality monitor and auto-retrain.
1 Enable line quality monitor and auto-retrain.
2 Enable line quality monitor and fallback/fall
forward. (Default.)
Result Codes
OK <value> = 0, 1, or 2.
ERROR Otherwise.
Fallback/Fall Forward. When %E2 is active, the modem monitors the line quality (EQM). When line quality is insufficient, the modem will initiate a rate renegotiation to a lower speed within the V.34/V.32 bis/V.32 (RC336) modulation speeds. The modem will keep falling back within the current modulation if necessary until the speed reaches 2400 bps (V.34) or 4800 bps (V.32). Below this rate, the modem will only do retrains if EQM thresholds are exceeded. If the EQM is sufficient for at least one minute, the modem will initiate a rate renegotiation to a higher speed within the current modulation speeds. The rate renegotiations will be done without a retrain if a V.32 bis connection is established.
Speeds attempted during fallback/fall forward are those shown to be available in the rate sequences exchanged during the initial connection. Fallback/fall forward is available in error correction and normal modes, but not in direct mode or synchronous mode with external clocks.
102184B Conexant 3-61
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
B - CCITT or Bell
When the modem is configured to allow either option, the modem will select Bell or CCITT modulation for a line speed connection of 300 or 1200 bps. Any other line speed will use a CCITT modulation standard. The parameter value, if valid, is written to S27 bit
6.
Syntax
B<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects CCITT operation at 300 or 1200 bps
during Call Establishment and a subsequent connection. (Default.)
1 Selects BELL operation at 300 or 1200 bps
during Call Establishment and a subsequent connection.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
3-62
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3.2.5 Error Control Commands

+ES - Error Control and Synchronous Mode Selection
This extended-format command specifies the initial requested mode of operation when the modem is operating as the originator, optionally specifies the acceptable fallback mode of operation when the modem is operating as the originator, and optionally specifies the acceptable fallback mode of operation when the modem is operating as the answerer. It accepts three numeric subparameters:
Syntax
+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]
Defined Values
<orig_rqst> Decimal number which specifies the initial requested mode of
<orig_fbk> Decimal number which specifies the acceptable fallback mode
operation when the modem is operating as the originator. The options are:
0 Initiate call with Direct Mode.
1 Initiate call with Normal Mode (also referred to
as Buffered Mode) only.
2 Initiate V.42 without Detection Phase. If V.8 is
in use, disable V.42 Detection Phase.
3 Initiate V.42 with Detection Phase. (Default.)
4 Initiate MNP.
6 Initiate V.80 Synchronous Access Mode when
connection is completed, and Data State is entered. (See +ESA and +ITF commands.)
7 Initiate Frame Tunneling Mode when connection
is complete, and Data Mode is entered.
of operation when the modem is operating as the originator.
0 LAPM, MNP, or Normal Mode error control
optional. (Default.)
1 LAPM, MNP, or Direct Mode error control
optional.
2 LAPM or MNP error control required;
disconnect if error control is not established.
3 LAPM error control required; disconnect if error
control is not established.
4 MNP error control required; disconnect if error
control is not established.
102184B Conexant 3-63
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
<ans_fbk> Decimal number which specifies the acceptable fallback mode
of operation when the modem is operating as the answerer or specifies V.80 Synchronous Access Mode.
0 Direct Mode.
1 Error control disabled, use Normal Mode.
2 LAPM, MNP, or Normal Mode error control
optional. (Default.)
3 LAPM, MNP, or Direct Mode error control
optional.
4 LAPM or MNP error control required;
disconnect if error control is not established.
5 LAPM error control required; disconnect if error
control is not established.
6 MNP error control required; disconnect if error
control is not established.
8 Initiate V.80 Synchronous Access Mode when
connection is completed, and Data State is entered (see +ESA and +ITF commands).
9 Initiate Frame Tunneling Mode when connection
is complete, and Data Mode is entered.
Examples
+ES=6 Enable V.80 Synchronous Access Mode originator.
+ES=6 Enable V.80 Synchronous Access Mode originator.
+ES=,,8 Enable V.80 Synchronous Access Mode answerer.
+ES=6,,8 Enable V.80 Synchronous Access Mode originator and answerer.
+ES=3 Enable V.42 with Detection Phase originator. Disable V.80
Synchronous Access Mode originator.
+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer. Disable
V.80 Synchronous Access Mode answerer.
+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM, MNP, or
Normal Mode connection answer. Disable Synchronous Access Mode originator and answerer.
Reporting Current or Selected Values
Command: +ES?
Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk>
Example: +ES: 3,0,2 For the default setting.
+ES: 6,0,8 For V.80 Synchronous Access Mode
originator and answerer.
Reporting Supported Range of Parameter Values
Command: +ES=?
Response: +ES: (<orig_rqst> range),( <orig_fbk> range), (<ans_fbk> range)
Example: +ES: (0-4,6,7),(0-4),(0-6,8,9)
3-64
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+EB - Break Handling in Error Control Operation
This extended-format compound parameter controls the break handling in V.42 operation. It accepts three numeric subparameters:
Syntax
+EB=[<break_selection>[,<timed>[,<default_length>]]]
Defined Values
<break_selection> Decimal number 0 specifying that break is to be ignored, i.e.,
not signaled to remote DCE.
<timed> Decimal number 0 specifying that any transmitted V.42 L-
SIGNAL will not indicate break signal length
<default_length> Decimal number 0 specifying that break is not delivered to the
DTE.
Reporting Current or Selected Values
Command: +EB?
Response: +EB: <break_selection>,<timed>,<default_length><CR>
Example: +EB: 0,0,0 For default settings.
Reporting Supported Range of Parameter Values
Command: +EB=?
Response: +EB: (<break_selection> range),(<timed> range),
(default_length> range)
Example: +EB: (0),(0),(0)
+ESR - Selective Repeat
This extended-format numeric parameter controls the use of the selective repeat (SREJ) option in V.42.
Syntax
+ESR=[<value>]
Decimal number 0 specifying that SREJ is not used.
Reporting Current or Selected Values:
Command: +ESR?
Response: +ESR: <value>
Example: +ESR: 0 For default setting
102184B Conexant 3-65
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Reporting Supported Range of Parameter Values:
Command: +ESR=?
Response: +ESR: (<value>)
Example: +ESR: (0)
+EFCS - 32-bit Frame Check Sequence
This extended-format numeric parameter controls the use of the 16-bit or 32-bit frame check sequence (FCS) option in V.42.
Syntax
+EFCS=[<value>]
Defined Values
<value> Decimal number 0 specifying the use of the 16-bit FCS
specified in V.42.
Reporting Current or Selected Values
Command: +EFCS?
Response: +EFCS: <value>
Example: +EFCS: 0 For default setting.
Reporting Supported Range of Parameter Values
Command: +EFCS=?
Response: +EFCS: (<value> range)
Example: +EFCS: (0)
3-66
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+ER - Error Control Reporting
This extended-format numeric parameter controls whether or not the extended-format +ER: intermediate result code is transmitted from the modem to the DTE.
S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more recent setting of +ER or S95 bit 3, and the W command setting, determines the actual error control result code reporting (see S95 Parameter and W Command).
+ER=[<value>]
Syntax
+ER=[<value>]
Defined Values
<value> A decimal number corresponding to the selected error control
option:
0 = Error control reporting disabled (no +ER
intermediate result code transmitted). (Default.)
1 = Error control reporting enabled (+ER
intermediate result code transmitted).
Reporting Current or Selected Values
Command: +ER?
Response: +ER: <current value>
Example: +ER: 0 for the default setting
Reporting Supported Range of Parameter Values
Command: +ER=?
Response: +ER: (<value> range)
Example: +ER: (0,1)
102184B Conexant 3-67
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+ER: <type>
The +ER: <type> reported represents the current (negotiated or renegotiated) modemĀ­modem error control type. If enabled, the intermediate result code is transmitted at the point during error control negotiation (handshaking) at which the modem has determined which error control protocol will be used (if any), before the final result code (e.g., CONNECT) is transmitted. The format of this result code is:
The +ER intermediate result code, if enabled, is issued after the Modulation report (+MCR and +MRR) and before the Data Compression Report (+DR).
Syntax
+ER: <type>
Defined Values
<type> An alphanumeric code corresponding to the selected protocol.
NONE Error control is not in use.
LAPM V.42 LAPM protocol is in use.
ALT MNP is in use.
Example
+ER: LAPM
3-68
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+ETBM - Call Termination Buffer Management
This extended-format compound parameter controls the handling of data remaining in modem buffers upon call termination. It accepts three numeric subparameters:
Syntax
+ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]
Defined Values
<pending_TD> Decimal number 0 specifying that disconnect will occur
immediately and all buffered transmit data will be discarded when the local DTE requests call disconnection.
<pending_RD> Decimal number 0 specifying that disconnect will occur
immediately and all buffered receive data will be discarded when the local DTE requests call disconnection.
<timer> Decimal number 0 specifying that the modem will not attempt
to deliver the buffered data before abandoning the attempt and discarding remaining data.
Reporting Current or Selected Values
Command: +ETBM?
Response: +ETBM: <pending_TD>,<pending_RD>,<timer>
Example: +ETBM: 0,0,0
Reporting Supported Range of Parameter Values
Command: +ETBM=?
Response: +ETBM: (<pending_TD> range),(<pending_RD> range),
(<timer> range)
Example: +ETBM: (0),(0),(0)
102184B Conexant 3-69
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
\B - Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in multiples of 100 ms according to parameter specified. If a number in excess of 9 is entered, 9 is used. The command works in conjunction with the \K command.
In error correction mode, the modem will signal a break through the active error correction protocol, giving no indication of the length.
Syntax
\B<value>
Defined Values
<value> Decimal number corresponding to the selected option.
1-9 Break length in 100 ms units. (Default = 3.)
(Non-error corrected mode only.)
Result Codes
OK If connected in data modem mode.
NO CARRIER If not connected or connected in fax modem mode.
Note: When the modem receives a break from the remote modem, break is passed to the DTE as follows: In non-error correction mode direct, the break length is passed; in nonĀ­error correction mode normal and in error correction mode, a 300 ms break is passed.
3-70
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
\K - Break Control
Controls the response of the modem to a break received from the DTE or the remote modem or the \B command. The parameter value, if valid, is written to S40 bits 3, 4, and
5.
Syntax
\K<value>
Defined Values
<value> Decimal number corresponding to the selected option.
The response is different in three separate states.
The first state is where the modem receives a break from the
DTE when the modem is operating in data transfer mode:
0 Enter on-line command mode, no break sent to
the remote modem.
1 Clear data buffers and send break to remote
modem.
2 Same as 0.
3 Send break to remote modem immediately.
4 Same as 0.
5 Send break to remote modem in sequence with
transmitted data. (Default.)
The second case is where the modem is in the on-line
command state (waiting for AT commands) during a data connection, and the \B is received in order to send a break to the remote modem:
0 Clear data buffers and send break to remote
modem.
1 Clear data buffers and send break to remote
modem. (Same as 0.)
2 Send break to remote modem immediately.
3 Send break to remote modem immediately.
(Same as 2.)
4 Send break to remote modem in sequence with
data.
5 Send break to remote modem in sequence with
data. (Same as 4.) (Default.)
102184B Conexant 3-71
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
The third case is where a break is received from a remote
modem during a non-error corrected connection:
0 Clears data buffers and sends break to the DTE.
1 Clears data buffers and sends break to the DTE.
(Same as 0.)
2 Send a break immediately to DTE.
3 Send a break immediately to DTE. (Same as 2.)
4 Send a break in sequence with received data to
DTE.
5 Send a break in sequence with received data to
DTE. (Same as 4.) (Default.)
Result Codes
OK 0 to 5.
ERROR Otherwise.
-K - MNP Extended Services
Enables or disables conversion of a V.42 LAPM connection to an MNP 10 connection. The parameter value, if valid, is written to S40 bits 0 and 1.
Syntax
-K<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables V.42 LAPM to MNP 10 conversion.
(Default.)
1 Enables V.42 LAPM to MNP 10 conversion.
2 Enables V.42 LAPM to MNP 10 conversion;
inhibits MNP Extended Services initiation during V.42 LAPM answer mode detection phase.
Result Codes
OK 0 or 2.
ERROR Otherwise.
3-72
Conexant 102184B
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

3.2.6 Data Compression Commands

This section contains parameters to condition modem use of standard ITU-T V.42bis Data Compression Procedures.
+DS - Data Compression
This extended-format compound parameter controls the V.42bis data compression function if provided in the modem. It accepts four numeric subparameters:
Syntax
+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]
Defined Values
<direction> Specifies the desired direction(s) of operation of the data
<compr_neg> Specifies whether or not the modem should continue to
<max_dict> Specifies the maximum number of dictionary entries (2048
<max_string> Specifies the maximum string length (32 bytes) to be
compression function; from the DTE point of view.
0 Negotiated; no compression (V.42bis P0=0).
3 both directions, accept any direction (V.42bis
P0=11). (Default.)
operate if the desired result is not obtained.
0 Do not disconnect if V.42bis is not negotiated by
the remote modem as specified in <direction>.
entries) which should be negotiated (may be used by the DTE to limit the codeword size transmitted, based on its knowledge of the nature of the data to be transmitted).
negotiated (V.42bis P2).
Reporting Current or Selected Values
Command: +DS?
Response: +DS: <direction>,<compr_neg>,<max_dict>,<max_string>
Example: +DS: 3,0,2048,32 for the defaults and 2048 entry max
dictionary.
Reporting Supported Range of Parameter Values
Command: +DS=?
Response: +DS: (<direction> range),(< compr_neg > range),
(<max_dict> range),(<max_string> range)
Example: +DS: (0,3),(0),(2048),(32)
102184B Conexant 3-73
AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
+DS44 - V.44 Compression Select
This extended-format compound parameter controls the V.44 data compression function.
Syntax
+DS44=[<direction>[,< compress_negotiation >[,<capability>[,<max_codewords_tx> [,<max_codewords_rx>[,<max_string_tx>[,<max_string_rx>[,<max_history_tx> [,<max_history_rx>]]]]]]]]]
Defined Values
<direction> Decimal number that specifies the desired direction(s) of
operation of the data compression function; from the DTE point of view.
0 Negotiated, no compression.
1 Transmit only.
2 Receive only.
3 Both directions, accept any direction. (Default.)
<compress_negotiation> Decimal number that specifies whether or not the modem
should continue to operate if the desired result is not obtained.
0 Do not disconnect if V.44 is not negotiated by
the remote DCE as specified in <direction>. (Default.)
1 Disconnect if V.44 is not negotiated by the
remote DCE as specified in <direction>.
<capability> Decimal number that specifies the use of stream method,
packet method, multi-packet method.
0 Stream method. (Default.)
1 Packet method.
2 Multi-packet method.
<max_codewords_tx> Decimal number from 256 to 2048 that specifies the
maximum number of codewords which should be negotiated in the transmit direction. (Default = 2048.)
<max_codewords_rx> Decimal number from 256 to 2048 that specifies the
maximum number of codewords which should be negotiated in the receive direction. (Default = 2048.)
<max_string_tx> Decimal number from 32 to 255 that specifies the
maximum string length to be negotiated in the transmit direction. (Default = 32.)
<max_string_rx> Decimal number from 32 to 255 that specifies the
maximum string length to be negotiated in the receive direction. (Default = 32.)
<max_history_tx> Decimal number from 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the transmit direction. (Default = 4096.)
<max_history_rx> Decimal number from 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the receive direction. (Default = 4096.)
3-74
Conexant 102184B
Loading...