AT Commands for
AT Commands for
AT Commands forAT Commands for
SmartSCM,
SmartSCM,
SmartSCM,SmartSCM,
SmartACF,
SmartACF,
SmartACF,SmartACF,
SmartACFL, and
SmartACFL, and
SmartACFL, andSmartACFL, and
SC56D Modems
SC56D Modems
SC56D ModemsSC56D Modems
Reference Manual
Reference Manual
Reference ManualReference Manual
Conexant Proprietary Information
Doc. No. 100722B
March 20, 2001
AT Commands Reference Manual
Revision Record
Revision Date Comments
100722B 3/20/2001 Rev. B release. Supersedes 100722A.
100722A 11/2/2000 Initial release.
© 2000, 2001
All Rights Reserved.
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Contents
Tables............................................................................................................................................................ xi
Figures ......................................................................................................................................................... xii
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
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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
2.6 Executing Commands..................................................................................................................................................2-8
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 .............................................................................................................3-16
E - Command Echo............................................................................................................................3-16
Q - Quiet Results Codes Control ........................................................................................................3-16
V - Result Code Form.........................................................................................................................3-17
W - Connect Message Control ...........................................................................................................3-17
X - Extended Result Codes.................................................................................................................3-18
&C - RLSD (DCD) Option...................................................................................................................3-23
&D - DTR Option ...............................................................................................................................3-23
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&K - Flow Control..............................................................................................................................3-24
&M - Asynchronous/Synchronous Mode Selection............................................................................3-25
&Q - Sync/Async Mode......................................................................................................................3-26
&R - RTS/CTS Option ........................................................................................................................3-27
&S - DSR Override.............................................................................................................................3-27
&X - Select Synchronous Clock Source .............................................................................................3-28
+IPR - Fixed DTE Rate .......................................................................................................................3-29
+IFC - DTE-Modem Local Flow Control..............................................................................................3-30
+ILRR - DTE-Modem Local Rate Reporting........................................................................................3-31
3.2.3 Call Control................................................................................................................................................3-32
D - Dial ..............................................................................................................................................3-32
T - Set Tone Dial Default....................................................................................................................3-35
P - Set Pulse Dial Default...................................................................................................................3-35
A - Answer.........................................................................................................................................3-35
H - Disconnect (Hang-Up) .................................................................................................................3-36
O - Return to On-Line Data Mode.......................................................................................................3-37
L - Speaker Volume ...........................................................................................................................3-38
M - Speaker Control...........................................................................................................................3-38
&G - Select Guard Tone.....................................................................................................................3-39
&P - Select Pulse Dial Make/Break Ratio............................................................................................3-39
&V - Display Current Configuration and Stored Profiles.....................................................................3-40
&V1 - Display Last Connection Statistics...........................................................................................3-41
\V - Single Line Connect Message Enable ..........................................................................................3-42
%L - Report Line Signal Level............................................................................................................3-43
%Q - Report Line Signal Quality ........................................................................................................3-43
*B - Display Blacklisted Numbers ......................................................................................................3-43
*D - Display Delayed Numbers ..........................................................................................................3-44
–PPD= - Extension Pickup Notification through 16550 UART ............................................................3-44
–STE= - Set Telephony Extension ......................................................................................................3-45
3.2.4 Modulation Control Commands.................................................................................................................3-51
+MS - Modulation Selection...............................................................................................................3-51
+MR - Modulation Reporting Control.................................................................................................3-53
%E - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward.........................3-55
%U - Select µ-Law or A-Law Codec Type...........................................................................................3-56
B - CCITT or Bell................................................................................................................................3-56
3.2.5 Error Control Commands...........................................................................................................................3-57
+ES - Error Control and Synchronous Mode Selection.......................................................................3-57
+EB - Break Handling in Error Control Operation................................................................................3-59
+ESR - Selective Repeat.....................................................................................................................3-59
+EFCS - 32-bit Frame Check Sequence ..............................................................................................3-60
+ER - Error Control Reporting............................................................................................................3-61
+ETBM - Call Termination Buffer Management...................................................................................3-63
\B - Transmit Break to Remote...........................................................................................................3-64
\K - Break Control ..............................................................................................................................3-65
-K - MNP Extended Services ..............................................................................................................3-66
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3.2.6 Data Compression Commands ..................................................................................................................3-67
+DS - Data Compression ...................................................................................................................3-67
+DS44 - V.44 Compression Select .....................................................................................................3-68
+DR - Data Compression Reporting...................................................................................................3-69
%C - Enable/Disable Data Compression.............................................................................................3-71
3.2.7 V.8/V.8bis Commands...............................................................................................................................3-72
+A8E - V.8 and V.8bis Operation Controls..........................................................................................3-72
+A8I: - CI Signal Indication ................................................................................................................3-73
3.2.8 Synchronous Access Mode Commands.....................................................................................................3-74
+ESA - Configure Synchronous Access Submode..............................................................................3-74
+H - Enable/Disable RPI.....................................................................................................................3-76
+ITF - Transmit Flow Control Thresholds...........................................................................................3-77
3.2.9 Diagnostic Commands ..............................................................................................................................3-78
#UD – Last Call Status Report............................................................................................................3-78
3.2.10 Compatibility Commands...........................................................................................................................3-86
&L - Leased Line Operation ...............................................................................................................3-86
)M - Enable Cellular Power Level Adjustment.....................................................................................3-86
@M - Initial Cellular Power Level Setting ...........................................................................................3-87
:E - Compromise Equalizer Enable Command ....................................................................................3-87
3.2.11 FastConnect Commands............................................................................................................................3-88
$F – FastConnect Control...................................................................................................................3-88
3.2.12 V.92 +P and –Q Commands.......................................................................................................................3-89
+PCW - Call Waiting Enable ...............................................................................................................3-89
+PMH - Modem-on-Hold Enable........................................................................................................3-90
+PMHT – Modem-on-Hold Timer.......................................................................................................3-91
+PMHR - Initiate Modem-on-Hold .....................................................................................................3-92
+PIG - PCM Upstream Ignore ............................................................................................................3-93
+PMHF - V.92 Modem-on-Hold Hook Flash.......................................................................................3-93
+PQC - V.92 Phase 1 and Phase 2 Control.........................................................................................3-94
+PSS - Use Short Sequence...............................................................................................................3-95
-QCPC - Force Full Startup Procedure Next Connection .....................................................................3-96
-QCPS - Enable Quick Connect Profile Save.......................................................................................3-96
3.3 S-Parameters ............................................................................................................................................................3-97
S - Read/Write S-Parameter...............................................................................................................3-97
3.3.1 FACTORY DEFAULTS.................................................................................................................................3-97
3.3.2 S-PARAMETER DEFINITIONS....................................................................................................................3-99
S0 - Number of Rings to Auto-Answer...............................................................................................3-99
S1 - Ring Counter..............................................................................................................................3-99
S2 - Escape Character........................................................................................................................3-99
S3 - Carriage Return Character ..........................................................................................................3-99
S4 - Line Feed Character....................................................................................................................3-99
S5 - Backspace Character ................................................................................................................3-100
S6 - Wait Time before Blind Dialing or for Dial Tone........................................................................3-100
S7 - Wait Time for Carrier, Silence, or Dial Tone..............................................................................3-100
S8 - Pause Time For Dial Delay........................................................................................................3-101
S9 - Carrier Detect Response Time..................................................................................................3-101
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S10 - Lost Carrier To Hang Up Delay ...............................................................................................3-101
S11 - DTMF Tone Duration ..............................................................................................................3-101
S12 - Escape Prompt Delay (EPD) ...................................................................................................3-102
S14 - General Bit Mapped Options Status........................................................................................3-102
S16 - Test Mode Bit Mapped Options Status....................................................................................3-102
S19 - Reserved ................................................................................................................................3-103
S20 - Reserved ................................................................................................................................3-103
S21 - V.24/General Bit Mapped Options Status................................................................................3-103
S22 - Speaker/Results Bit Mapped Options Status...........................................................................3-104
S23 - General Bit Mapped Options Status........................................................................................3-104
S24 - Sleep Inactivity Timer.............................................................................................................3-104
S25 - Delay To DTR Off....................................................................................................................3-105
S26 - RTS to CTS Delay...................................................................................................................3-105
S27 - Bit Mapped Options Status.....................................................................................................3-105
S28 - Bit Mapped Options Status.....................................................................................................3-106
S29 - Flash Dial Modifier Time.........................................................................................................3-106
S30 - Disconnect Inactivity Timer ....................................................................................................3-106
S31 - Bit Mapped Options Status.....................................................................................................3-107
S36 - LAPM Failure Control .............................................................................................................3-107
S38 - Delay Before Forced Hang Up.................................................................................................3-108
S39 - Flow Control Bit Mapped Options Status................................................................................3-108
S40 - General Bit Mapped Options Status........................................................................................3-108
S41 - General Bit Mapped Options Status........................................................................................3-109
S46 - Data Compression Control .....................................................................................................3-109
S48 - V.42 Negotiation Control ........................................................................................................3-109
S86 - Call Failure Reason Code........................................................................................................3-110
S91 - PSTN Transmit Attenuation Level...........................................................................................3-111
S92 - Fax Transmit Attenuation Level...............................................................................................3-111
S95 - Extended Result Codes Control ..............................................................................................3-111
S210 – V.34 Symbol Rates ..............................................................................................................3-112
3.4 Cellular Commands.................................................................................................................................................3-113
3.4.1 Cellular Phone Drivers.............................................................................................................................3-113
3.4.2 Cellular Commands .................................................................................................................................3-113
^C2 - Download Cellular Phone Driver.............................................................................................3-113
^I - Identify Cellular Phone Driver....................................................................................................3-114
^T6 - Indicate Status of Cellular Phone............................................................................................3-114
3.4.3 Operation.................................................................................................................................................3-115
Modem Configuration......................................................................................................................3-115
Fax Configuration.............................................................................................................................3-116
Cellular Phone Configuration ...........................................................................................................3-116
3.5 Result Codes...........................................................................................................................................................3-118
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
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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
+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 Fax Class 2 Commands........................................................................................................................ 5-1
5.1 Command and Syntax Guidelines................................................................................................................................5-2
5.1.1 Mode Entry Commands...............................................................................................................................5-2
+FCLASS=2 - Select Facsimile Class 2 Mode .......................................................................................5-2
5.1.2 DTE Commands...........................................................................................................................................5-2
DTE Command Lines ...........................................................................................................................5-2
Facsimile Command Syntax.................................................................................................................5-2
5.1.3 Serial Port Speed and Flow Control .............................................................................................................5-4
Data Stream Termination.....................................................................................................................5-4
DTE to DCE Streams............................................................................................................................5-4
DCE to DTE Streams............................................................................................................................5-4
5.1.4 Auto Answer................................................................................................................................................5-4
5.1.5 Identification of T.30 Options ......................................................................................................................5-5
5.1.6 Session Status Reporting ............................................................................................................................5-5
5.1.7 Procedure Interrupt Negotiation ..................................................................................................................5-5
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5.2 Service Class 2 Identification and Selection.................................................................................................................5-5
5.2.1 +FMFR? - Request Manufacturer Identification............................................................................................5-5
5.2.2 +FMDL? - Identify Product Model................................................................................................................5-5
5.2.3 +FREV? - Identify Product Revision.............................................................................................................5-6
5.3 Service Class 2 Action Commands ..............................................................................................................................5-6
5.3.1 ATD - Originate a Call ..................................................................................................................................5-6
5.3.2 ATA - Answer a Call.....................................................................................................................................5-7
Manual Call Answer.............................................................................................................................5-7
Automatic Answer................................................................................................................................5-7
Connection as a Data Modem ..............................................................................................................5-7
5.3.3 +FDT - Data Transmission ...........................................................................................................................5-7
Initiate Page Transmission...................................................................................................................5-8
Continue a Page...................................................................................................................................5-8
Phase C Data Framing..........................................................................................................................5-8
Phase C Data Format ...........................................................................................................................5-8
<CAN> - Escape from Transmission ....................................................................................................5-9
5.3.4 +FET - Transmit Page Punctuation.............................................................................................................5-10
End a Page.........................................................................................................................................5-10
5.3.5 +FDR - Begin or Continue Phase C Receive Data .......................................................................................5-11
Initiate Document Reception..............................................................................................................5-11
Continue Document Reception...........................................................................................................5-12
Phase C Data Framing........................................................................................................................5-12
Phase C Data Format .........................................................................................................................5-12
<CAN> - Escape from Reception........................................................................................................5-12
5.3.6 +FK - Session Termination.........................................................................................................................5-13
5.3.7 +FCIG - Set Polling ID................................................................................................................................5-13
5.3.8 +FLPL - Indicate a Document for Polling ...................................................................................................5-13
5.3.9 +FSPL - Enable Polling..............................................................................................................................5-13
5.4 Service Class 2 DCE Responses ................................................................................................................................5-15
5.4.1 +FCON - Facsimile Connection Response ..................................................................................................5-15
5.4.2 +FDCS: - Report Current Session Capabilities............................................................................................5-15
5.4.3 +FDIS: - Report Remote Station Capabilities..............................................................................................5-15
5.4.4 +FCFR - Indicate Confirmation to Receive..................................................................................................5-15
5.4.5 +FTSI: - Report the Transmit Station ID.....................................................................................................5-15
5.4.6 +FCSI: - Report the Called Station ID.........................................................................................................5-16
5.4.7 +FPTS: - Receive Page Transfer Status......................................................................................................5-16
5.4.8 +FET: - Post Page Message Response.......................................................................................................5-16
5.4.9 +FPTS: - Transmit Page Transfer Status....................................................................................................5-16
5.4.10 +FHNG: - Call Termination with Status.......................................................................................................5-17
5.4.11 +FCIG: - Report the Polled Station ID.........................................................................................................5-17
5.4.12 +FDTC: - Report the Polled Station Capabilities .........................................................................................5-17
5.4.13 +FPOLL - Indicate Polling Request ............................................................................................................5-17
5.5 Service Class 2 Parameters .......................................................................................................................................5-18
5.5.1 +FDCC - DCE Capabilities Parameters........................................................................................................5-18
5.5.2 +FDIS - Current Sessions Capabilities Parameters.....................................................................................5-19
5.5.3 +FDCS - Current Session Results Parameters............................................................................................5-19
5.5.4 +FLID= - Local ID String............................................................................................................................5-20
5.5.5 +FCR - Capability to Receive......................................................................................................................5-20
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5.5.6 +FPTS= - Page Transfer Status..................................................................................................................5-21
5.5.7 +FCQ - Copy Quality Checking ...................................................................................................................5-21
5.5.8 +FPHCTO - DTE Phase C Response Time-out ............................................................................................5-21
5.5.9 +FAXERR - T.30 Session Error Report.......................................................................................................5-21
5.5.10 +FBOR - Data Bit Order..............................................................................................................................5-22
5.5.11 +FAA - Answer Parameter..........................................................................................................................5-22
5.5.12 +FBUF? - Buffer Size..................................................................................................................................5-23
5.6 Example Sessions .....................................................................................................................................................5-23
6 Voice Commands................................................................................................................................. 6-1
6.1 Voice Commands Overview.........................................................................................................................................6-1
6.1.1 <DLE> Shielded Event Codes Sent to the DTE..............................................................................................6-2
6.1.2 <DLE> Shielded Codes Sent to the Modem (DCE) .......................................................................................6-3
6.2 Voice Commands........................................................................................................................................................6-4
6.2.1 Configuration Commands............................................................................................................................6-4
+FCLASS=8 - Select Voice Mode .........................................................................................................6-4
+VNH - Automatic Hang-up Control.....................................................................................................6-4
6.2.2 Voice Commands ........................................................................................................................................6-5
+VIP - Voice Initialize All Parameters...................................................................................................6-5
+VRX - Start Modem Receive (Record)................................................................................................6-5
+VTS - Send Voice Tone(s)..................................................................................................................6-6
+VTX - Start Modem Transmit (Playback)............................................................................................6-8
+VGR - Voice Gain Receive (Record Gain) ...........................................................................................6-8
+VGT - Voice Gain Transmit (Playback Volume) ..................................................................................6-9
+VIT - Voice Inactivity Timer (DTE/Modem).......................................................................................6-10
+VLS - Analog Source/Destination Selection......................................................................................6-11
+VRA - Ringback Goes Away Timer ...................................................................................................6-14
+VRN - Ringback Never Appeared Timer............................................................................................6-15
+VSD - Silence Detection (Quiet and Silence) ....................................................................................6-16
+VSM - Compression Method Selection ............................................................................................6-17
+VTD - Beep Tone Duration Timer .....................................................................................................6-18
+VDR - Distinctive Ring.....................................................................................................................6-19
+VDT - Control Tone Cadence Reporting............................................................................................6-20
+VPR - Select DTE/Modem Interface Rate (Turn Off Autobaud).........................................................6-21
6.2.3 Speakerphone Commands.........................................................................................................................6-22
+VSP - Speakerphone ON/OFF...........................................................................................................6-22
+VDX - Speakerphone Duplex Mode ..................................................................................................6-23
+VGM - Microphone Gain ..................................................................................................................6-24
+VGS - Speaker Gain .........................................................................................................................6-25
Index ................................................................................................................................................................
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Tables
Table 3-1. Upload Messages..........................................................................................................................................3-15
Table 3-2. Result Codes.................................................................................................................................................3-20
Table 3-3. +MS Command Supported Rates..................................................................................................................3-51
Table 3-4. AT#UD Last Call Status Report Format .........................................................................................................3-81
Table 3-5. Call Setup Result Codes................................................................................................................................3-82
Table 3-6. Multimedia Modes ........................................................................................................................................3-82
Table 3-7. DTE-DCE modes ...........................................................................................................................................3-82
Table 3-8. V.34 INFO bit report......................................................................................................................................3-82
Table 3-9. gstnModulationSchemeActive from 3.7.2/V.58.............................................................................................3-83
Table 3-10. errorControl Active from 3.5.2/V.58............................................................................................................3-83
Table 3-11. compressionActive from 3.2.2/V.58............................................................................................................3-83
Table 3-12. callCleared codes from 3.6.4/V.58-1994.....................................................................................................3-84
Table 3-13. Completed Data Call, with some errors and rate retrain during the call .......................................................3-85
Table 3-14. S-Parameter Summary ...............................................................................................................................3-98
Table 3-15. Remote Modem Configuration and Resulting Transmit Levels..................................................................3-117
Table 3-16. Result Code Definitions.............................................................................................................................3-119
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. Fax Class 2 Commands...................................................................................................................................5-1
Table 5-2. T.30 Session Subparameter Codes .................................................................................................................5-9
Table 5-3. T.30 Post Page Message Codes ....................................................................................................................5-10
Table 5-4. T.30 Post Page Response Messages.............................................................................................................5-10
Table 5-5. Hang Up Status Codes..................................................................................................................................5-14
Table 5-6. Send Two Pages, 1-D, No Errors ..................................................................................................................5-24
Table 5-7. Receive Two Pages, 1-D Data, No Errors ......................................................................................................5-25
Table 6-1. Voice Commands............................................................................................................................................6-1
Table 6-2. Supported <DLE> Shielded Codes Sent to the DTE.........................................................................................6-2
Table 6-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE)..........................................................................6-3
Table 6-4. +VNH Command Behavior ..............................................................................................................................6-4
Table 6-5. +VLS Command Options...............................................................................................................................6-12
Table 6-6. Events Detectable in the Voice Mode per V.253 ............................................................................................6-13
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Figures
Figure 5-1. T.30 Session Parameter Relationships ........................................................................................................5-18
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1.1
AT Commands Reference Manual
Introduction
Overview
This manual describes the host command and responses for the following Conexant
modem families:
SmartSCM™ Modem Device Set
SmartACF™ Modem Device Set
SmartACFL™ Modem Device Set
SC56D Modem Device
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.
1.1.1
1.1.2
1.1.3
The descriptions in this manual apply to all commands and parameters that may be
supported by different modem models. Refer to Modem Firmware Release notes for
commands applicable to specific modem models.
Command Syntax
The fundamental DTE interface command syntax is described in Section 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 5
Fax Class 2 commands Section 6
Voice/Audio commands Section 7
Call Progress and Blacklisting Parameters
The SmartACF, SmartACFL, and SC56D 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.
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Preconfigured Form. Specific MCU firmware configurations may be released that can
be directly installed without requiring the use of ConfigurACE II.
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AT Commands Reference Manual
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.
1.2
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.
Reference Documentation
Document Title Document No.
SmartSCM Modem Data Sheet 100490
SmartACF Modem Data Sheet 100488
SmartACFL Modem Data Sheet 100444
SC56D Modem Data Sheet 101098
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AT Commands Reference Manual
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.
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
2.2.1
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).
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.
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AT Commands Reference Manual
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).
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.
Repeating a Command Line
2.2.5
2.3
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).
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).
Basic Syntax Commands
2.3.1
2-2
Basic Syntax Command Format
The format of Basic Syntax commands, except for the D and S commands, is as follows:
<command>[<number>]
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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.
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.
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Extended Syntax Commands
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
The modem considers lower-case characters to be the same as their upper-case
equivalents.
Values
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.
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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 ‘"’ (IA5 2/2) and "\" (IA5 5/12).
String constants are bounded at the beginning and end by the double-quote character (‘"’,
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>
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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
2-6
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.
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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
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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.
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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.
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.
2.6
2.6.1
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.
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.
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.
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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.
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.
2.7.1
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.
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
parameter S3 followed by the character having the ordinal value of parameter S4.
3. Information text usually consists of a single line; information text returned in
response to some commands may contain multiple lines, and the text may therefore
include CR, LF, and other formatting characters to improve readability.
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
command setting.
2. The result text may be transmitted as a number or as a string, also depending on a the
V command setting.
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Result Code Types. There are three types of result codes: final, intermediate, and
unsolicited. Result codes are described in Section 3.5.
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.
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>
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Fax Modes. If a single value is to be reported, the form of the result code is:
<value> or (<value>)
+<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.
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3
3.1
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Data Command Set
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
3.2
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.
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.
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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.
0 Soft reset and restore stored profile 0.
1 Soft reset and restore stored profile 1.
Result Codes
OK <value> = 0 or 1.
ERROR Otherwise.
+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).
2 Select Facsimile Class 2 Mode. (Section 5).
8 Select Voice Mode. (Section 6).
10 Reserved.
Result Codes
OK For <mode> = 0, 1, 1.0, 2, 8, and 10 (SmartSCM only).
OK For <mode> = 0, 1, 1.0, 8, and 10 (other than SmartSCM).
ERROR Otherwise.
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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: (0,1,1.0,2,8,10)
+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)
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+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)
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\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.)
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Result Codes
OK <mode> = 0 to 5.
ERROR Otherwise.
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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., “56000”.
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 SmartACFL, SmartACF, and SC56D, the
codes are in the form RevisionNameModulation_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 SmartSCM, the codes are in the form
RevisionName-Modulation, where:
RevisionName = masked firmware code
version. Example: P2109
Modulation = V90, V34, or V32 for V.90,
V.34, or V.32bis, respectively.
Examples:
ACF3_V1.000-V90_P21_FSH
P2109-V90
Note: If RPI+ is enabled (see +Hn),
“ROCKWELL RPI (TM) MODEM+01” is
appended.
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4 Reports OEM defined identifier string in either
Hayes-compatible binary format (default) or
ASCII format (selectable by ConfigurACE), e.g.:
a007040284C6002F
bC60000000
r1005111151012000
3000111170000000
5 Reports Country Code parameter (see +GCI).
6 Reports modem data pump model and internal
code revision. Example:
“RCV56DPF-PLL L8773A Rev 14.00/34.00”.
7 Reports “OK”.
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
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+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)
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+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:
Country Code Country Code Country Code
Australia 09 Hong Kong 50 Norway 82
Austria 0A Hungary 51 Philippines 89
Belgium 0F India 53 Poland 8A
Brazil 16 Ireland 57 Portugal 8B
Bulgaria 1B Israel 58 Russia B8
Canada 20 Italy 59 Singapore 9C
China 26 Japan 00 South Africa 9F
Czech and Slovak
Federal Republic
Denmark 31 Luxembourg 69 Sweden A5
Finland 3C Malaysia 6C Switzerland A6
France 3D Mexico 73 Taiwan FE
Germany 42 Netherlands 7B United Kingdom B4
Greece 46 New Zealand 7E United States B5
2E Korea 61 Spain A0
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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: (20,73,B5) The modem can be set for Canada,
Mexico or the United States.
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&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.
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&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.
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&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>.
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%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
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**- Load Flash Memory
The linear flash memory uploader allows flash memory connected to the modem external
memory bus to be upgraded with revised modem firmware. This process transfers
(uploads) the upgraded modem firmware (data) from the host computer to the modem
which transfers the data to the flash memory device. The linear flash memory downloader
allows the flash memory connected to the modem external memory bus to read and
saved. This process transfers (downloads) the current modem firmware (data) to the host
computer. Uploading new firmware to the flash memory or downloading existing
firmware from the flash memory 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 a flash load module (FLM) into the modem's RAM. If the user
wishes to upload new firmware to the modem, he should load the uploader FLM. If
the user wishes to download existing firmware from the modem, he should load the
downloader FLM. In either case, 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. If the user wishes to upload new firmware to the modem, then he will then load the
new modem firmware which the uploader FLM will then program into the flash
memory device. This transfer is done via XMODEM transfer. If the user wishes to
download existing firmware from the modem, then he will set up the host PC for
XMODEM receive and the downloader FLM will begin to send the existing
firmware from the flash memory to the host PC.
Procedure
1. Install in the modem a flash memory programmed with the modem firmware or a
blank flash memory.
2. Put the uploader FLM and downloader FLM files and the new modem firmware file
(e.g., XmUL003.s37, XmDL003.s37, and 206s4712.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.
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., XmUL003.s37 for uploading new
firmware to the modem or XmDL003.s37 for downloading existing firmware from
the modem) 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, if uploading new firmware to the modem, perform
an XMODEM upload of the new modem firmware hex file (e.g., 206s4712.S37)
from the host computer to the modem RAM using an industry standard
communications software or an equivalent process. If downloading existing
firmware from the modem, using an industry standard communications software or
equivalent, put the host PC in XMODEM receive mode.
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8. The messages described in Table 3-1 may occur during the uploading process:
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
Download abort Displayed if the transfer is aborted before it is finished. If this
Erase fail
Download error, Re-Load
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.
Displayed if there is an error while either uploading or
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.
Displayed if the FLM is unable to erase the flash memory. If this
occurs, the user should restart at step 5.
Displayed if there was an error when uploading or downloading. If
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 either
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 uploader and downloader flash load modules (FLM) have 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 “flash rescue mode”. In
this mode, the modem will respond “OK” 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 “flash rescue mode” 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.
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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.
0 Disables command echo.
1 Enables command echo. (Default.)
Result Codes
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.
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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 3.5 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.
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Result Codes
OK <value> = 0, 1, or 2.
ERROR Otherwise.
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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, 1.0, or 2), 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
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3 Enables reporting of busy tones; send only OK,
4 Enables reporting of busy tones; send all
Result Codes
OK <value> = 0 to 4.
ERROR Otherwise.
101b is written to S22 bits 6, 5, and 4,
respectively.
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.
messages. The value 111b is written to S22 bits
6, 5, and 4, respectively. (Default.)
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Table 3-2. Result Codes
Short Form Long Form n Value in ATXn Command Notes
0 1 2 3 4
+F4+FCERROR xxxxx
0 OK xxxxx
1 CONNECT xxxxx
2 RING xxxxx
3 NO CARRIER xxxxx
4 ERROR xxxxx
5 CONNECT 1200 1 xxxx
6 NO DIAL TONE 33xxx
7 BUSY 333xx
8 NO ANSWER xxxxx
9 CONNECT 600 1xxxx
10 CONNECT 2400 1 xxxx
11 CONNECT 4800 1 xxxx
12 CONNECT 9600 1 xxxx
13 CONNECT 7200 1 xxxx
14 CONNECT 12000 1 xxxx
15 CONNECT 14400 1 xxxx
16 CONNECT 19200 1 xxxx
17 CONNECT 38400 1 xxxx
18 CONNECT 57600 1 xxxx
19 CONNECT 115200 1 xxxx
20 CONNECT 230400 xxxxx
22 CONNECT 75TX/1200RX 1 xxxx
23 CONNECT 1200TX/75RX 1 xxxx
24 DELAYED 4444x
32 BLACKLISTED 4444x
33 FAX xxxxx
35 DATA xxxxx
40 +MRR: 300 xxxxx
44 +MRR: 1200/75 xxxxx
45 +MRR: 75/1200 xxxxx
46 +MRR: 1200 xxxxx
47 +MRR: 2400 xxxxx
48 +MRR: 4800 xxxxx
49 +MRR: 7200 xxxxx
50 +MRR: 9600 xxxxx
51 +MRR: 12000 xxxxx
52 +MRR: 14400 xxxxx
53 +MRR: 16800 xxxxxNote 2
54 +MRR: 19200 xxxxxNote 2
55 +MRR: 21600 xxxxxNote 2
56 +MRR: 24000 xxxxxNote 2
57 +MRR: 26400 xxxxxNote 2
58 +MRR: 28800 xxxxxNote 2
59 CONNECT 16800 1 xxxxNote 2
61 CONNECT 21600 1 xxxxNote 2
62 CONNECT 24000 1 xxxxNote 2
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Table 3-2. Result Codes (Continued)
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 xxxxx
67 +DR: V42B xxxxx
69 +DR: NONE xxxxx
70 +ER: NONE xxxxx
77 +ER: LAPM xxxxx
78 +MRR: 31200 xxxxxNote 2
79 +MRR: 33600 xxxxxNote 2
80 +ER: ALT xxxxx
81 +ER: ALT-CELLULAR xxxxx
83 LINE-IN-USE xxxxx
84 CONNECT 33600 1 x x x x Note 2
91 CONNECT 31200 1 x x x x Note 2
134+MCR: B103 xxxxx
135+MCR: B212 xxxxx
136+MCR: V21 xxxxx
137+MCR: V22 xxxxx
138+MCR: V22B xxxxx
139+MCR: V23 xxxxx
140+MCR: V32 xxxxx
141+MCR: V32B xxxxx
142+MCR: V34 xxxxxNote 3
144+MCR: K56 xxxxxNote 3
145+MCR: V90 xxxxxNote 3
150 +MRR: 32000 xxxxxNote 3
151 +MRR: 34000 xxxxxNote 3
152 +MRR: 36000 xxxxxNote 3
153 +MRR: 38000 xxxxxNote 3
154 +MRR: 40000 xxxxxNote 3
155 +MRR: 42000 xxxxxNote 3
156 +MRR: 44000 xxxxxNote 3
157 +MRR: 46000 xxxxxNote 3
158 +MRR: 48000 xxxxxNote 3
159 +MRR: 50000 xxxxxNote 3
160 +MRR: 52000 xxxxxNote 3
161 +MRR: 54000 xxxxxNote 3
162 +MRR: 56000 xxxxxNote 3
165 CONNECT 32000 xxxxxNote 3
166 CONNECT 34000 xxxxxNote 3
167 CONNECT 36000 xxxxxNote 3
168 CONNECT 38000 xxxxxNote 3
169 CONNECT 40000 xxxxxNote 3
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Table 3-2. Result Codes (Continued)
Short Form Long Form n Value in ATXn Command Notes
0 1 2 3 4
170 CONNECT 42000 xxxxxNote 3
171 CONNECT 44000 xxxxxNote 3
172 CONNECT 46000 xxxxxNote 3
173 CONNECT 48000 xxxxxNote 3
174 CONNECT 50000 xxxxxNote 3
175 CONNECT 52000 xxxxxNote 3
176 CONNECT 54000 xxxxxNote 3
177 CONNECT 56000 xxxxxNote 3
178 CONNECT 230400 xxxxx
180 CONNECT 28000 xxxxxNote 3
181 CONNECT 29333 xxxxxNote 3
182 CONNECT 30667 xxxxxNote 3
183 CONNECT 33333 xxxxxNote 3
184 CONNECT 34667 xxxxxNote 3
185 CONNECT 37333 xxxxxNote 3
186 CONNECT 38667 xxxxxNote 3
187 CONNECT 41333 xxxxxNote 3
188 CONNECT 42667 xxxxxNote 3
189 CONNECT 45333 xxxxxNote 3
190 CONNECT 46667 xxxxxNote 3
191 CONNECT 49333 xxxxxNote 3
192 CONNECT 50667 xxxxxNote 3
193 CONNECT 53333 xxxxxNote 3
194 CONNECT 54667 xxxxxNote 3
195 +MRR: 28000 xxxxxNote 3
196 +MRR: 29333 xxxxxNote 3
197 +MRR: 30667 xxxxxNote 3
198 +MRR: 33333 xxxxxNote 3
199 +MRR: 34667 xxxxxNote 3
200 +MRR: 37333 xxxxxNote 3
201 +MRR: 38667 xxxxxNote 3
202 +MRR: 41333 xxxxxNote 3
203 +MRR: 42667 xxxxxNote 3
204 +MRR: 45333 xxxxxNote 3
205 +MRR: 46667 xxxxxNote 3
206 +MRR: 49333 xxxxxNote 3
207 +MRR: 50667 xxxxxNote 3
208 +MRR: 53333 xxxxxNote 3
209 +MRR: 54667 xxxxxNote 3
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. RC336 and RC56 modems only.
3. RC56 modems only.
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&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.
1 DTR drop is interpreted according to the current
&Qn setting as follows:
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&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.
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&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, +FCLASS=1 or +FCLASS=2 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.
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&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.) (SmartACF and
SmartACFL 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.) (SmartACF and
SmartACFL 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.) (SmartACF and SmartACFL
only.)
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Result Codes
OK <value> = 0 to 3 (SmartACF and SmartACFL)
OK <value> = 0 (SmartSCM)
ERROR Otherwise.
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&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.)
(SmartACF and SmartACFL 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.) (SmartACF and
SmartACFL 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.) (SmartACF and
SmartACFL 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.
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Result Codes
OK <value> = 0 to 3, 5, or 6 (SmartACF and SmartACFL only)
OK <value> = 0, 5, or 6 (SmartSCM only)
ERROR Otherwise.
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&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.
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&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.
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+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)
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+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.
0None.
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.
0None.
1 XON/XOFF on received data.
2 CTS/RTS. (Default.)
3-30
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)
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+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>]
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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
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, 1.0, or 2 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>
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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.
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& 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.
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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, 1.0, or 2 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.)
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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.
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O - Return to On-Line Data Mode
This command determines how the modem will enter the on-line data mode. If in the online 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.
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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.
0Low 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.
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&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
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OK <value> = 0 to 3.
ERROR Otherwise.
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&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
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&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
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\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 = “V92” for V.92 modulation.
“V90” for V.90 modulation.
“K56” for K56flex modulation.
“V34” for V.34 modulation.
“V32” for V.32 or V.32bis modulation.
Note: Modulation is omitted for all other modulations.
Protocol = “NONE” for no protocol.
“ALT” for Microcom Network Protocol.
“LAPM” for LAP-M protocol.
Compression = “V44” for V.44 compression.
“V42B” for V.42bis compression.
“ALT” for Microcom MNP5 compression.
Note: Compression is omitted if protocol is NONE.
Line Speed = Asymmetric rates are displayed as “/rate:TX/rate:RX”, e.g.,
/1200 TX/75 RX.
Symmetric rates are displayed as a single DCE rate, e.g.,
14400.
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%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
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*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.
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–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
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Result Codes
OK <value> = 0-7
ERROR Otherwise.
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 offhook and will return with the message LINE-IN-USE.
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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 linkdisconnect, 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 onhook, then respond with NO DIAL TONE 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 a NO CARRIER 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.
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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 a NO CARRIER 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 CARRIER. 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
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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 DIAL TONE
Modem is connected in data mode and an extension goes off-hook
AT-STE=2
ATDT555-1212
CONNECT
NO CARRIER 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
NO CARRIER Remote modem drops line
ATS86=?
025
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Modem is connected in data mode and the LOCAL HANDSET goes off-hook
AT-STE=7
ATDT555-1212 5 sec delay
CONNECT
NO CARRIER Local handset goes off-hook,
GSTN Cleardown sent, and remote modem goes on-hook
ATS86=?
025
500ms 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
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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
ATDT5551212
LINE-IN-USE
hangs up the phone
CONNECT
Delay 30 seconds
Try again some time later user
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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 3-3.
Table 3-3. +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
K56flex K56
V.90 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
V.92 downstream V92
V.92 upstream V92
Some <carrier> values may not be supported by certain model models. For example,
Note:
modem models supporting V92 may not support K56.
33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,
40000, 38000, 36000, 34000, 32000
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
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)
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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 3-3.
<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 3-3. 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 3-3.
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.)
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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: K56, 1,300,33600,300,56000
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 1: +MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,
K56,V90),(0,1),(300-33600),(300-33600),(300-56000),(300-56000)
Example 2: +MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,
V90,V92),(0,1),(300-33600),(300-33600),(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>]
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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
K56 For K56flex
V90 For V.90
V92 For V.92
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+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.
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%U - Select µ-Law or A-Law Codec Type
This command selects µ-Law or A-Law codec type for V.90 and K56flex modulation.
This command also stores the selected setting directly to NVRAM. The default value is
country specific.
Syntax
%U<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects µ-Law.
1 Selects A-Law.
Result Codes
OK <value> = 0 or 1
ERROR Otherwise.
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.
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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
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.
<orig_fbk> Decimal number which specifies the acceptable fallback mode
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.
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<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.
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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)
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+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
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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)
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+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>]
+ER=[<value>]
+ER=[<value>]+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)
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+ER: <type>
The +ER: <type> reported represents the current (negotiated or renegotiated) modemmodem 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
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+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)
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\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 nonerror correction mode normal and in error correction mode, a 300 ms break is passed.
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\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.)
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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.
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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
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.)
<compr_neg> Specifies whether or not the modem should continue to
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>.
<max_dict> Specifies the maximum number of dictionary entries (2048
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).
<max_string> Specifies the maximum string length (32 bytes) to be
negotiated (V.42bis P2).
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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)
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+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.)
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Reporting Current or Selected Values
Command: +DS44?
Response: +DS44:<direction>,<compression_negotiation>,<capability>,
<max_codewords_tx>,<max_codewords_rx>,<max_string_tx>,
<max_string_rx>,<max_history_tx>,<max_history_rx>
Example: +DS44:3,0,0,2048,2048,32,32,4096,4096 For the default setting.
Reporting Supported Range of Parameter Values
Command: +DS44=?
Response: +DS44:(list of supported <direction> values),(list of supported
<compression_negotiation> values),(list of supported <capability>
values),(list of supported <max_codewords_tx> values),(list of supported
<max_codewords_rx> values),(list of supported <max_string_tx>
values),(list of supported <max_string_rx> values),(list of supported
<max_history_tx> values),(list of supported <max_history_rx> values)
+DR - Data Compression Reporting
This extended-format numeric parameter controls whether or not the extended-format
+DR: intermediate result code is transmitted from the modem to the DTE.
S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of
+DR or S95 bit 5, and the W command setting, determines the actual data compression
result code reporting (see S95 Parameter and W Command).
Syntax
+DR=[<value>]
Defined Values
<value> decimal number corresponding to the selected option:
0 Data compression reporting disabled (no +DR
result code transmitted).
1 Data compression reporting enabled (+DR result
code transmitted). (Default.)
Reporting Current or Selected Values
Command: +DR?
Response: +DR: <current value>
Example: +DR: 1 For the default setting.
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Reporting Supported Range of Parameter Values
Command: +DR=?
Response: +DR: (<value> range)
Example: +DR: (0,1)
+DR: <type> Intermediate Result Code
The +DR: <type> reported represents the current (negotiated or renegotiated) modemmodem data compression type. If enabled, the intermediate result code is transmitted at
the point after error control negotiation (handshaking) at which the modem has
determined which data compression technique will be used (if any) and the direction of
operation. The +DR intermediate result code, if enabled, is issued after the Error Control
Report (+ER) and before the final result code (e.g., CONNECT).
The format of this result code is:
Result Code Syntax
+DR: <type>
Defined Values
<type> An alphanumeric code corresponding to the selected option:
NONE Data compression is not in use.
V42B V.42bis is in use in both directions.
V42B RD V.42 bis is in use in receive direction only
V42B TD V.42 bis is in use in transmit direction only
V44 V.44 is in use in both directions
V44 RD V.44 is in use in receive direction only
V44 TD V.44 is in use in transmit direction only
ALT MNP 5 compression.
Example
+DR: V42B
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%C - Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only perform data
compression on an error corrected link. The parameter value, if valid, is written to S41
bits 0 and 1.
Syntax
%C<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables data compression. Resets S46 bit 1.
1 Enables MNP 5 data compression negotiation.
Resets S46 bit 1.
2 Enables V.42 bis data compression. Sets S46 bit
1.
3 Enables both V.42 bis and MNP 5 data
compression. Sets S46 bit 1. (Default.)
Result Codes
OK <value> = 0, 1, 2, or 3.
ERROR Otherwise.
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V.8/V.8bis Commands
+A8E - V.8 and V.8bis Operation Controls
This command is defined for two conditions: as a parameter while the modem is on-hook,
and as an action command while the modem is off-hook. If enabled, V.8 negotiation does
not preclude simultaneous implementation of other negotiation means (e.g., V.8bis, V.18,
V.32bis Annex A).
This command is a compound parameter if issued while the modem is on-hook, used to
precondition V.8 and V.8bis originating and answering operation. It is issued by the DTE
before the Dial (D) or Answer (A) command, regardless of the state of the +FCLASS
parameter.
This command is an action command if issued while the modem is off-hook, to (re)start
V.8 or V.8bis negotiation. For example, if initial V.8 negotiation failed, but subsequent
T.30 negotiation indicated V.8 capability, this command may be used to initiate V.8
negotiation.
Syntax
+A8E=<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Defined Values
<v8o> Decimal number which enables/disables issuance of +A8x
indications during modem-controlled V.8 origination
negotiation.
1 Enable DCE-controlled V.8 origination
negotiation without +A8x indications. (Default.)
6 Enable DCE-controlled V.8 origination
negotiation with +A8x indications.
<v8a>= Decimal number which enables/disables issuance of +A8x
indications during modem-controlled V.8 answer negotiation.
1 Enable DCE-controlled V.8 answer negotiation
without +A8x indications. (Default.)
5 Enable DCE-controlled V.8 answer negotiation
with +A8x indications.
<v8cf>= Set the V.8 CI signal call function to the hexadecimal octet
XY.
00 (Default.)
21
C1
<v8b>= Decimal number which enables/disables V.8bis negotiation.
0 Disable V.8bis negotiation.
1 Enable V.8bis negotiation. (Default.)
<cfrange>= “<string of values>“. Applicable only for <v8a>=5. Not
supported.
< protrange >= “<string of values>“. Applicable only for <v8a>=5. Not
supported.
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Default values: 1,1,00,1,0,0
The ATD and ATA commands behave as specified in V.250, and +A8n indications are
not generated by the modem.
For subparameter values <v8o>=6 and <v8a>=5, the +A8I indications are issued during
the course of the V.8 session to notify the DTE when the relevant V.8 signals are
received.
Reporting Current or Selected Values
Command: +A8E?
Response: +A8E: <v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Example: +A8E: 1,1,00,1,0,0 For the defaults
Reporting Supported Range of Parameter Values
Command: +A8E=?
Response: +A8E: (<v8o> range),(<v8a> range),(v8cf in octets),
(<v8b> range),(<cfrange>),(<protrange>)
Example: +A8E: (1,6),(1,5),(0,21,C1),(0,1),(0),(0)
+A8I: - CI Signal Indication
This indication is issued by an answering modem, if +A8E,<v8a> ≠ 0, to indicate
detection of a V.8 CI signal, and report the recovered Call Function octet(s).
Indication Syntax
+A8I:<v8cf><CR>
Defined Values
<v8cf> A hexadecimal code octet representation of those Call
Function octet(s). +A8I:0 indicates that the modem timed out
waiting for CI.
Example
+A8I:0 The modem timed out waiting for CI.
+A8I:X YYY
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Synchronous Access Mode Commands
Three commands support Synchronous Access Mode:
+ES Enables and disables Synchronous Access Mode in the client
or central site modem (see 0)
+ESA Configures the operation of the Synchronous Access Submode
+ITF Selects Transmit Flow Control Thresholds
Enabling Synchronous Access Mode enables the use of the 8-bit command characters
defined in Table 9/V.80 of the Draft ITU-T Recommendation V.80 (DATA
COMMUNICATION OVER THE TELEPHONE NETWORK; In-Band DCE Control
and Synchronous Data Modes for Asynchronous DTE).
+ESA - Configure Synchronous Access Submode
The operation of the Synchronous Access sub-Mode is configured by the +ESA
parameter.
This extended-format compound parameter is used to control the manner of operation of
the Synchronous Access Mode in the modem. It accepts six numeric subparameters:
Syntax
+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>[,<
nrzi_en>[,<syn1>[,<syn2>]]]]]]]]
Defined Values
<trans_idle> Specifies the bit sequence transmitted by the modem when a
transmit data buffer underrun condition occurs, while
operating in Transparent sub-Mode. The options are:
0 In Transparent sub-Mode, modem transmits 8-bit
SYN sequence on idle. Modem receiver does not
hunt for synchronization sequence (default and
fixed).
<framed_idle> Specifies the bit sequence transmitted by the modem when a
transmit data buffer underrun condition occurs immediately
after a flag, while operating in Framed sub-Mode. The options
are:
0 In Framed sub-Mode, modem transmits HDLC
flags on idle (default and fixed).
<framed_un_ov> Specifies the actions undertaken by the modem when a
transmit data buffer underrun or overrun condition occurs
immediately after a non-flag octet, while operating in Framed
sub-Mode.
0 In Framed sub-Mode, modem transmits abort on
underrun in middle of frame (default).
1 In Framed sub-Mode, DCE transmits a flag on
underrun in middle of frame, and notifies DTE of
underrun or overrun.
3-74
Conexant
100722B
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