Multi-Tech Systems MT2834BL Series, MT2834BA Series manual Line Probe Commands, Force Answer Mode a

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Chapter 5 - Command Mode

Force Answer Mode A

You can force the modem into Answer mode with the modem’s A command.

Entering ATA when in Command mode immediately brings your modem off-hook, out of Command mode and into On-Line Answer mode, and causes it to transmit its carrier signal over the phone line. If no responding carrier tone is received by your modem within forty-five seconds (or some other time as determined by S-Register S7), your modem stops transmitting its tone, hangs up, and goes back into Command mode.

Exiting Command Mode, Going Back On-Line O

You can bring the modem out of Command mode and back into On-Line mode by entering ATO (where O is the letter O, not the number 0). In this case, the O command reverses what was done by entering the Escape Code. The O command will bring the modem into the same On-Line mode (Originate or Answer) that it was in prior to going into Command mode.

5.4.13Line Probe Commands

Before V.34 negotiation takes place, remote and local modems transfer their functional capabilities using modulated calling and answering tones; indicating the common capabilities of the modem at each end.

Once this is done, a probing signal is passed between the modems to identify impairments in the telephone channel (e.g., Receive Signal Strength vs. Frequency, Noise vs. Frequency and Signal to Noise Ratio vs. Frequency). After receiving the results of the probing signal, the modem receivers and transmitters begin with the lowest speed and move up until reaching the highest speed at which they can exchange data. All this occurs in about five seconds.

There are a number of Line Probe Commands. These commands are configurable and can be stored to RAM (via AT&W0).

These commands are listed below.

Enable/Disable Reading of Line Probe Information Commands:

%DP0 = Do not read Line Probe information from DSP during handshake (Default). %DP1 = Read Line Probe information from DSP during handshake.

Format of Line Probe (Graph or Table) Commands:

%DF0 = Data is displayed in Graph format. Y axis is shown in dBms (Default).

%DF1 = Data is displayed in Table format. Numeric values are displayed for 150Hz to 3750Hz in 75HZ increments.

Immediate Action Line Probe Commands:

To activate these commands first type +++AT<CR>(on-line escape command while maintaining command mode), then type the Command prefixed by an AT.

&RP = This command initiates a retrain that makes the processor read Line Probe information. Valid only when on-line in V.34 mode.

L9 = Displays Signal Strength information.

L10 = Displays Signal to Noise Ratio information (SNR).

L11 = Displays noise information.

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Contents User Guide Record of Revisions Date Description User GuidePatents TrademarksContents Index 117 RegistersIntroduction and Description Introduction How To Use This ManualModem Features Fax Features 1 MT2834BA/BL Series FeaturesTechnical Specifications Power MT2834BA LED Display Modem LED IndicatorsControls on PC Board Installation and Connection Installation What Is in Your Modem Package?Safety Warnings Installation ProcedureMultiModemBA Connections Is Your Modem Ready for Use? Installing PhoneTools, the Data Communications SoftwareSoftware Configuration and Modem Basics Configuring Software for Your Modem Configuring Your SoftwareSoftware Configuration PC Initialization StringsConfiguring Software for Your Computer Changing Default ParametersOther Parameters AT &F S0=0 &F9 &W0 CRAnswer/Originate Voice/Data Toggle Switch Modem BasicsSimple Operations Manual Dial and Automatic Answer Manual Dial and Automatic Answer Dialing/On-Line/AnsweringManual Dial Backup Call Termination Dial Backup and Leased Line RestoralAutomatic Leased Line Restoral Operation Manual Call Origination Dial-Up OperationManual Answering Automatic AnsweringAbort Timer Handshaking DetailsCall Termination Command Mode AT Command Editing Command ModeFunctional Modes Functional Modes Summary of AT CommandsStore Modem Configure Data Result Codes Multi-Tech Result CodesStandard AT Result Codes Dialing Action Commands Dialing CommandsVoice/Data Dialing $VD Dial Modifier CommandsPulse or Tone Dial P T Set Pulse Dial Ratios &PReverse the Mode of Operation R Return to Command Mode After Dial Command ExecutionAutomatic Pauses in Dialing Long Space Disconnect YQuiet Answer @ Calling Card Detect Tones $Storing Phone Numbers D...N Phone Number Memory CommandsNumber Linking NN Listing Numbers Stored in Memory LConfiguration and Default Storage Commands Loading Factory Defaults &FModem Reset Z Async/Sync Mode Switching &M Unix Uucp Spoofing $SPSynchronous Transmit Clock Select &X Echo Command Mode Characters E Command Response Result Code CommandsResult Codes Enable/Disable and No Response Answer Q Result Codes Multi-Tech or Standard AT &QResult Codes Basic and Extended and Call Progress Selection Enable/Disable Trelis Coded Modulation #T Phone Line Conditioning CommandsGuard Tones Not Used in BAI/BLI Models &G Bell/V.21 ToneEnable/Disable Lowspeed Fast Connect $FC Fallback Modes When On-Line #FCleardown at Disconnect &CD Auto Speed Detect #ACarrier Detect Control &C 7 RS-232C Interface Control CommandsData Terminal Ready Control &D CTS Control &RData Set Ready Control &S CTS/RTS Interaction Control &RFDSR/CD Interaction Control &SF Normal Mode &E0 Error Correction CommandsAuto-Reliable Mode &E1 Reliable Mode &E2Auto-Reliable Buffering $A Mode Select #LEnable/Disable Auto Reliable Fallback Character $F Error Correction/300bps $ERetransmit Count $R Flow Control Commands Hardware Flow Control &E4Xon/Xoff Flow Control &E5 Xon/Xoff Pass-Through &E7 Send Xon/Xoff Characters #XHewlett-Packard ENQ/ACK Pacing &E9 Terminal/Computer Initiated Pacing &E13 Normal Mode Modem Flow Control On &E11Maximum Block Size &BS Parity Selection #PNormal/Auto-Reliable/Reliable Mode Commands Xon/Xoff Pass-Through CommandsEnq/Ack Pacing Commands Speed Conversion Commands Speed Conversion $BAModem Baud Rate $MB Serial Port Baud Rate $SB Immediate Action Commands Off Hook H Listing On-Line Diagnostics L8Line Probe Commands Force Answer Mode aExiting Command Mode, Going Back On-Line O Registers Rings Which Have Occurred Number of Rings Until Modem AnswersEscape Code Character Return CharacterLine Feed Character Time for Carrier Abort TimerBackspace Character Wait Time for Dial ToneS13 Remote Configuration Escape Character S10 Carrier Loss Disconnect Delay TimeCarrier Detect Response Time S11 Tone Dialing Tone Spacing and DurationS19 MT2834BL Only Dial-Back Timer S15 Callback Time DelayS16 Callback Attempts S17 Changing Break TimeS29 Local Inactivity Timer S26 Failed Password AttemptsS24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S25 DTR Dropout TimeS32 Time Elapse for Escape Sequence S30 Inactivity TimerS36 Time Between DTR Inactive and Modem Off-Hook S37 Time Between DTR Active and Modem On-HookS48 Program V.34bis Connect Speeds Reading and Assigning S-Register Values Examples of Assigning ValuesExamples of Reading Values AT Command and S-Register Summary Callback Security and Remote Configuration Callback Security and Remote Configuration Callback Feature DescriptionTo change your Remote Configuration feature status Remote Configuration DescriptionAT#CBN0xxxxxxxxxxCR To set parity of the password/message promptCallback Operational Sequence Procedures Remote Configuration Operation Procedures Remote Configuration ProceduresRemote Configuration and Callback Security AT Commands Remote Configuration/Callback Security S-Registers DIP-Switch Settings MT2834BA PC Board Dip-Switch SettingsDIP-Switch Option Settings Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP = Down Down Dip-Switch Settings Speaker Volume Control Switch Function Position Effect Recording Option ConfigurationsDIP Switches #13-14 DIP Switches #15-16 MT2834BADIP Switches #15-16 MT2834BL Warranty, Service and Tech Support Warranty, Service, and Technical Support Multi-Tech Systems, Inc. Warranty & Repairs PoliciesRepair Procedures for International Distributors Online Warranty RegistrationTechnical Support Replacement PartsInternet Sites Country TelephoneAppendixes Upgrade Overview Appendix a Upgrading Your Modem’s FirmwareAppendix a Upgrading Your Modem’s Firmware Download the Upgrade File Upgrade the Modem’s Firmware None of the LEDs Light When the Modem Is On Appendix B TroubleshootingModem Does Not Respond to Commands Appendix B TroubleshootingAppendix B Troubleshooting Modem Dials But Cannot Make a Connection Modem Disconnects While On-line Modem Cannot Connect When AnsweringFile Transfer Is Slower Than It Should Be Am Losing DataAm Getting Garbage Characters on the Monitor Appendix C AT Command Summary Appendix C AT Command SummaryCommand Values Description Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 100 DsNdMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 101 $FCn MT2834BLMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 102 $MBnMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 103 $SBnMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 104 Dial ToneCallback Security/Remote Configuration Command Summary 25bis Commands Password Command SummaryAppendix D V.25bis Operation Delayed and Forbidden Numbers25bis Operation Appendix D V.25bis Operation25bis DIP-Switches 25bis Mode AT Commands25bis Set-Up and Initialization Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 108Enable/Disable V.25bis Mode $V Command 25bis AT CommandsChange Serial Baud Rate CSP Command 25bis Responses Result CodesListing Delayed Phone Numbers RLD Command Dial Phone Number Provided CRN CommandListing Forbidden Phone Number RLF Command Disregard or Connect to Incoming Calls DIC or CIC CommandITU V.25bis Country Specific Information Appendix D V.25bis Operation Belgium SingaporeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 112 Appendix E MultiModemBA/BL Cables Appendix E MultiModemBA CablesAppendix F Regulatory Information FCC Part 68 TelecomFCC Part Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 115 Canadian Limitations NoticeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 116 South African NoticeAppendix G Weee Statement Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 117 IndexMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 118 91-116Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 119 PBX/CBX Disconnect Drop Time for DSR/CTS/CD63