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Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual Details of Some Low-Speed Protocols

Models: SI2493/57/34/15/04 SI2494/39

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AN93

Details of Some Low-Speed Protocols

The following annotated recordings give basic ideas of what to expect the EPOS modem transactions will look like. There are many possible variations of these examples, both in and out of compliance with published standards, in common use. There are also very unusual variations that Silicon Labs has made efforts to support in order to allow customers to connect to non-standard and essentially broken modems. Some of these are described in a later section.

Bell 212 (2225 Hz Answer Tone)

DTMF dialing

Answering modem’s Scambled Binary Ones and Scrambled Data; visually indis-

tinguishable from each other.

Calling modem’s Scrambled Binary

Ones and Scrambled Data; visually indis- tinguishable from each other.

Figure 64. Appearance of Bell 212 Protocol

2100 Hz

Answer Tone

DTMF dialing

Unscrambled Binary Ones (USB1) signal.

Two tones at 2250 and 2850 Hz.

Scrambled Binary Ones and Scrambled Data; visually indis- tinguishable from each other.

Calling modem’s Scrambled Binary Ones and Scrambled Data; visually indis- tinguishable from each other.

Figure 65. Appearance of V.22 Protocol

Rev. 1.3

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Silicon Laboratories SI2494/39, SI2493/57/34/15/04 Details of Some Low-Speed Protocols, Appearance of Bell 212 Protocol

Contents

Introduction Functional Block DiagramAN93 Table of Contents AN93 AN93 AN93 AN93 Document Change List Contact Information Protocol Function Si2494/93 Si2457 Si2439/34 Si2415 Si2404 Selection GuideModulations ProtocolsPart Numbers Package Carriers and TonesISOmodem Capabilities ReleaseReset Sequence Resetting the DeviceModem System-Side Device Reset Strapping General Considerations Reset-Strap Options for 24-Pin Tssop Package SOIC-16 Reset-Strap OptionsReset-Strap Options for 16-Pin Soic Package Mode Reset-Strap Pins Interface Input Clock Pin 5, RXD/MISOTSSOP-24 Parallel-Interface Options TSSOP-24 UART-Interface OptionsTSSOP-24 SPI-Interface Clock-Frequency Options Reset Strapping Options for QFN Parts with Uart OperationInput Clk Reset Strapping Options for QFN parts with SPI OperationPin Functions vs. Interface Mode TSSOP-24 Pin Functions vs. Interface Mode SOIC-16System Interface Pin Functions vs. Interface Mode QFN-38 SPI-Interface Signals UART-Interface SignalsParallel-Interface Signals DTE Rates Ideal DTE Rate bps Actual DTE Rate bps Approximate Error%Symbol Data bits Parity Stop bits Serial Formats Detected in Autobaud ModeFlow Control OCD Can MonitorU70 Bit Function PPDParallel and SPI Interface Operation Uart Serial InterfaceTX Fifo Hardware Interface Register Hardware Interface Register Bit MapSignal Function Direction Parallel Interface SignalsParallel Interface Operation Parallel Interface Read Timing Interface Communication Modes Bit Function Meaning when High Meaning when LowSPI Control-and-Address Bit Definitions SPI Interface OperationSleep Mode Low-Power ModesPower-Down Mode Wake-on-Ring ModeSSI Interface Pin Connection SSI/Voice Mode 24-Pin Tssop and 38-Pin QFN OnlySignal Pin Number TSSOP-24 QFN-38 Clkout Fsync SDI SDO ResetEeprom Timing Eeprom CommandsEeprom Interface 24-Pin Tssop and 38-Pin QFN Only Eeprom Status Register Any Other Bits are UnusedEOZ Parameter Symbol Min Typ Max UnitEcsh Eecs Eeprom Three-Wire SPI Interface to EepromBoot Commands Custom Defaults Detailed Eeprom ExamplesFirmware Upgrades AT Command Macros Customized AT CommandsBoot Command Example Autoloading Firmware Upgrade Example AT Command Macro ExampleCombination Example Command FunctionCombination Example Dec Hex Display Ascii ChartDAA Line-Side Device Hookswitch and DC TerminationPulse Dialing and Spark Quenching AC Termination Settings for the Si3018 Line-Side DeviceAC Termination Ringer Impedance and ThresholdTypical Loop Voltage LVS Transfer Function Loop Current Transfer Function Ilim =LVCS40 Condition Billing Tone Detection Legacy-Mode Line Voltage and Loop Current MeasurementComponent Functions Power Supply and Bias CircuitryHookswitch and DC Termination Hardware Design ReferenceOptional Billing-Tone Filter Ringer NetworkTIP From Line Ring DAA Symbol ValueEMI/EMC Si3018/10 Schematic SchematicComponent Value Suppliers Bill of MaterialsLayout Guidelines Reference Placement ISOmodem Layout Check List Layout ChecklistLayout Items Required AN93 Module Design Module Design and Application ConsiderationsMotherboard Design Analog Output Modem Module VCC and Reset FilterAudio Quality Audio Filter ResponseController Modem Reference GuideDSP AT Command SetConfiguration Status Command ActionCommand Result Command ExamplesMultiple AT Commands on a Single Line Command Result CommentConsecutive U-Register Writes on a Single Line Basic AT Command SetATI0 ATI1 EnableNo Patch AT Command Chip Revision ModifierATI0 AT Command Chip RevisionRevision B Patch rbpXYYYY Revision C Patch rcpXYYYYSpeaker is always off Enable result codes See TableCommand Action Verbal result codes Program RAM write this command is used to upload firmware +DRV42B RD Disabled+DR=X +DRNONEC,D Specifies the mode of operation when initiating a modemConnection = Disable synchronous access mode Specifies the mode of operation when answer a modemDuring transparent sub-mode = CRC generation checking disable= Nrzi encoding and decoding disabled Specifies action taken if an underrun condition occursClass 1 Transmit Carrier Country United States defaultBPS +GCI?Fixed DTE Rate Automatically detect the baud rateITU-T V.90 default for Si2457 V22B ITU-T V.22bis default for Si2404V32B ITU-T V.32bis default for Si2415 ITU-T V.34 default for Si2434+PQC=X Enable Short Phase 1 and Short Phase+PMHR=X +PMHT=XDistinctive Ring DCEs decide to use short startup procedures= After ring only = OffISOmodem on-hook. Aout disabled. Tone detec Command Action Transmit Gain SelectionLoad Voice Factory Defaults DTE/DCE Inactivity TimerIs five seconds Ringing Tone Goes Away TimerRinging Tone Never Appeared Timer OK result code. Default time is 0 secondsSigned PCM Speakerphone AEC, AES and LEC disabledDtmf / Tone Duration Timer Voice Compression MethodKbps max default for Si2457 transmit and Si2434 Extended AT CommandsExtended AT& Command Set Kbps max default for Si2415Only 56 kbps to 28 kbps TIP + Disable automatic line-in-use detection Extended AT% Command SetEnable V.42bis in transmit and receive paths ISOmodem answers a call in answer modeMode is not allowed with a parallel or SPI interface Extended AT\ Command Set\Q2 Use CTS only \P0 Even\T16 Autobaud On4 \T9 Kbps4\V0 Report connect and protocol message Numeric1 Meaning Verbal Response Result CodesProtocol None StasPolarity Reversal No Polarity ReversalUN-OBTAINABLE Number ALTERNATE, +CLASSDisconnect Code Reason Disconnect CodesAscii Definition Register Function Default Range Units DecimalRegisters Register DescriptionsAll spaces 0s Symbol Rate Allowable Data Rates 2400 Symbols/secondRegister Address Name Description Default Hex DT4B2 U0FDT4A0 DT4B1Bdlt U2EBmtt U2FFHT U4EPrdd U4FSC0 V9AGGSamco SasfRegister Summary Bit-Mapped U-Register SummaryU0-U16 Dial Tone Registers Register Name Description Default2. U00-U16 Dial Tone Detect Filter Registers 3. U17-U30 Busy Tone Detect Filter Registers U17-U30 Busy Tone Detect Registers320/630 310/510 Default Busy and Dial ToneBPF Biquad Stage Output Scalar 300/480400/440 BPF Biquad Values5. U34-U35 Dial Tone Timing Register Ringback Cadence RegistersDial Tone Timing Register 4. U31-U33 Ringback Cadence RegistersDtmf Dial Registers Pulse Dial Registers7. U46-U48 Dtmf Dial Registers 8. U49-U4C Ring Detect Registers Ring Detect Registers9. U4D Modem Control Register 1-MOD1 Register U4D Bit Map Transmit Level Register Pre-Dial Delay Timer RegisterFlash Hook Time Register Loop Current Debounce RegistersU54 Bit Map U53 Bit MapU62 Bit Map U65 Bit Map U63 Bit Map= Normal operation Line-Side Chip Power Down17. U67-U6A International Configuration Registers PDLU67 Bit Map U66 Bit MapU68 Bit Map 19. U6E-U7D Modem Control and Interface Registers U6A Bit MapU6C Bit Map 18. U6C Line-Voltage Status RegisterU6F Bit Map U6E Bit MapPtmr U70 Bit Map Function 155 Reserved Read returns zero Type Reset settings = BitDisables PCM mode Enables PCM mode U71 IO1 Bit D15 D14 D13 D12 D11 D10 NameU77 Bit Map U76 Bit MapU78 Bit Map Monitor Mode ValuesU79 Bit Map = Normal Atdtw operation U7A Bit MapAdaptive Dialing Given time Synchronous Mode= Normal asynchronous mode Pin indicates valid ring signal20. U80 Transmit Delay for V.22 Fast Connect = Disables No Loop Current Detect= Timed calibration disabled = ATZ enabledFramed Sub-Mode Startup Special Error Reporting Mode= Ignore unrecognized in-band commands Minimal TransparencyFirmware Upgrades Method Patch, 115 kbaud Uart Lines Reset, thenEscape Methods Load Technique and Speed TableTh Bit Escape 1. +++ EscapeEscape Pin Escape To Enable Use AT Commands Error CorrectionWire Mode Enabling Error Correction/Data CompressionEpos Electronic Point of Sale Applications Legacy Synchronous DCE Mode/V.80 Synchronous Access Mode15. V.80 Mode Synchronous Mode OverviewAT\N0 Synchronous Access Mode SettingsIndicator pair Code Transparent Submode Command Hex Supported Transmit Direction Receive DirectionCRC EM In-Band Commands and Statuses Code Transparent Submode Fast Connect SettingsCommand Supported Transmit Direction Receive DirectionATDT12345 Connect 1200 Protocol None 0x190x190x110x11 Quick Reference Modem Feature vs. Hardware, AT Command and Register SettingFunction/Feature AT Commands Registers Programming ExamplesReg Bit Val Function Country-Dependent SetupDC Termination Control Bits DC TerminationCountry Initialization Country ConfigurationCountry Initialization Table Country Initialization TableAT+GCI=9C AT+GCI=AAT+GCI=F AT+GCI=16AT+GCI=6C AT+GCI=26AT+GCI=27 AT+GCI=31AT+GCI=3D AT+GCI=3CAT+GCI=42 AT+GCI=58 AT+GCI=46AT+GCI=53 AT+GCI=57AT+GCI=9F AT+GCI=59AT+GCI=0 AT+GCI=61AT+GCI=7B AT+GCI=69AT+GCI=87 AT+GCI=7EAT+GCI=82 AT+GCI=89AT+GCI=A0 AT+GCI=B8UAE AT+GCI=A5AT+GCI=A6 AT+GCI=FEAT+GCI=B4 International Call Progress Registers Line Interface/Control Registers Dial RegistersS42 Blacklisting AT Command FunctionSpecial Requirements for Serbia and Montenegro BlacklistingCaller ID Modes Caller IDProtocol SMS CommandsSMS Support Japan Caller ID150 Johndoe Type II Caller ID/SAS DetectionMdmf Parameters Character Description Hexadecimal Value Ascii ValueSAS Cadence for Supported Countries SAS Tone FrequencyAustria Country Tone Frequency Hz Cadence seconds RegistersAruba AustraliaCzech Republic Country Tone Frequency Hz Cadence seconds Registers ChinaCroatia CyprusHong Kong GreeceGuyana HondurasJordan IsraelJapan 064 0.436Lithuania KiribatiKorea Republic Lao P.D.RParaguay NigeriaOman Papua New GuineaSaudi Arabia Country Tone Frequency Hz Cadence seconds Registers RussiaSt.-Kitts-and-Nevis St. LuciaTobago SwedenTajikistan TrinidadLoop Voltage Action Intrusion/Parallel Phone DetectionOn-Hook Condition Line Not Present/In Use Indication Method 1-FixedOff-Hook Condition Line Not Present/In Use Indication Method 2-AdaptiveRegister Bits Name Function Intrusion DetectionATH1 Value Description Possible Responses to Pmhr Command from Remote ModemModem-On-Hold Initiating Modem-On-HoldReceiving Modem-On-Hold Requests Hdlc Bit Errors on a Noisy LineDCE Bit ErrorsBeginning of Packet Data Meaning Bit Errors0D 0A 4E 4F 20 43 52 49 45 52 0D 0A Register Bit Value Function Overcurrent DetectionPulse/Tone Dial Decision Overcurrent DetectionAutomatic Phone Line Configuration Possible +PMHT Settings Telephone Voting Mode12. V.92 Quick Connect AT+PSS Parameters AT+PQC ParametersHandset, TAM, and Speakerphone Operation Extended AT+ Command SetSoftware Reference Distinctive Ring Cadence Reporting Command Action Caller ID TypeCaller ID Enable After ring onlyCommand Action Analog Source / Destination Selection Compression Selection Method Command Action Ringing Tone Never Appeared TimerSpeakerphone AEC, AES and LEC disabled. Handset FIR filter +VTS command. Default time is 1 second dur =Transmit Voice Stream Command Action Dtmf and Tone GenerationFormat DLECode DLE Commands DTE-to-DCEDLE Commands DTE-to-DCE Code Hex Simple Action Command DescriptionSUB DLE Simple Events DCE-to-DTEDLE Events DCE-to-DTE Simple Event Reporting Code Hex Description180 Format DLEXResponseDLE Description Voice Mode U Registers AddressDescription Default Complex Event ReportingRegister Address Name Description Default Voice Mode U RegistersHRXFIR4 HRXFIR1HRXFIR2 HRXFIR3STXFIR4 STXFIR1STXFIR2 STXFIR3SRXFIR4 SRXFIR1SRXFIR2 SRXFIR3U199 Bit Definitions U19EVoice Reference-Overview TAM, Handset, and Speakerphone Voice Paths Rev 189 +VTX +VRX +VSP +VTS Voice Mode Operations +FCLASS=8ATZ or Input Current Modem Settings Command orEvent +VNH = ATH or DTR off &D2Si3000 Configuration TAM Pstn System Voice ModesInitialization Sequence InitializationRev 195 Handset Handset ConfigurationOverview AT+VLS=13 AT+VLS=0AT+VSP=0 Handset Manual Off-Hook Dial Handset Automatic Tone DialHandset Automatic Pulse Dial Terminate Handset to TAM Hands-Free TransitionAT+VLS=14 Speakerphone Transition Handset to Speakerphone TransitionAT+VSP=1 Local Ring Notification with Type I CID Event Telephone Answering MachineNAME=JONES Jennifer AT+VRX Connect TAM Hands-Free Record OGMRecord OGM ATU199&FFFDReview ICM TAM Hands-Free Review OGMReview OGM Record Local ICMTAM Handset Record OGM Trigger receive operation. The first byte TAM Handset Review OGM AT+VSM=4 Normal Answer OGM Playback with ICM Record TAM Pstn Normal Answer OGM Playback with ICM RecordICM AT+VLS=15Interrupted Answer OGM Playback with Dtmf Menu Entry DLE1 Dtmf 1 digit detected Simplex Speakerphone SpeakerphoneExternal Microphone/Speaker Calibration Register Name Description Default ValueTransmit Gain Calibration-Speakerphone Disabled Simplex Speakerphone U RegistersTransmit Gain Configuration AT+FCLASS=8 Transmit/Receive Gain Calibration Dial Remote TelephoneReceive Gain Reference Measurements Receive Gain ConfigurationReg Name Bit U19E Speakerphone Calibration-AEC Gain CalibrationAEC Gain Calibration Dial Remote Telephone Speakerphone Configuration Speakerphone ConfigurationSimplex Speakerphone Configuration Call-Automatic Tone Dial Simplex Speakerphone ConfigurationSpeakerphone Automatic Tone Dial Speakerphone Manual Off-Hook DialSpeakerphone to Handset Transition Speakerphone Automatic Pulse DialCall-Automatic Pulse Dial References GlossaryTermination Implementing the SIA Protocol Security ProtocolsAT+F0 Considerations when Disconnecting the SessionAT+F4 AT+F1AT+F2 AT+F3Result Code Meaning Remarks Implementing the Ademco Contact ID Protocol Kissoff Ademco Contact ID Protocol Tone Transmission AT CommandsDtmf Digit Low Tone Hz High Tone Hz Contact ID AT Command Modem Specific Implementation DetailsEvent Modem-to-DTE indication Remarks Ademco Mode of OperationStep DTE-to-Modem Command Modem-to-DTE Remarks Indication Handshake Tone DetectionWait for Receiver to answer with handshake tones Delay 250 ms before transmitting Data TonesMessage ATH Wait for Kissoff toneRev 233 SMS Message Format Chinese ePOS SMS+FCLASS=256 SMS AT Command SetAT Commands for SMS AT Command ISOmodem Response DescriptionSMS User Registers Register Bits Name Description Default Hex= Auto Mode User Registers for SMS OperationsExample ProcedureCrlfconnect Crlf Connect 2CRLF ResponseDleetxcrlfno Carriercrlf Connect 1CRLFDleetxcrlfokcrlf Example SessionPOS SMS Process in Host and Modem Prototype Bring-Up Si3018/10 Testing and DiagnosticsHost Interface Troubleshooting  Inappropriate Commands Command Timing  Register Configurations Connect Evaluation Board to Prototype System Isolation Capacitor Troubleshooting10.1.6. Si3018/10 Troubleshooting Component TroubleshootingEVB Test the Host InterfaceTest the Prototype Si3018/10 Circuitry Si3018/10 Resistance Si3018/10 Typical Voltages Resistance to Si3018/10 PinComponent Voltage Resistance across ComponentsVoltages across Components with Diode Checker FB1 FB2 RV1Loop Test Circuit Self TestBell 103-V.34 Modem Functional Test Connection Board TestTest Coverage Teltone ILSIsdn Modem Modem Under TestAT Commands for Compliance Testing Compliance TestingAT Command/Test Method Desired Response Transmit Modulation Data Rate Symbol/Data RateS41 Symbol Rate Allowable Data Rates 29 Data RateSurges SafetyPublished Coilcraft TRF-RJ11 Filter Performance AM-Band InterferenceDebugging the DTE Interface Debugging the DTE interfaceModulation Appendix A-EPOS ApplicationsRecommendation 0xFF 0x19 0xA0 0x19 0xB1 ISOmodem V.80 Protocol Hdlc Framing in Framed Sub-Mode ISOmodem in Epos ApplicationsAT+FCLASS=1 Setup procedure29 FastPOS Sample Program AT&D2Example Program in C/C++ How to use the programRev 263 264 Rev 265 True Rev 267 = Rtscontrolenable Rev 269 270 FastPOS Detailed Wave Files RTS not RTS signalFastPOS DTE Trace Times When Audio Recording May Not Help When to Use Audio RecordingHardware Setup Larger of the two jacks 3.5 mm carries audio to the PC Setting PC Microphone Input for Recording Windows NTSounds and Multimedia Properties Setting PC Microphone Input for Recording WindowsMultimedia Properties Setting PC Microphone Input for Recording Windows XPSounds and Audio Devices Properties Sound Recorder Making the Recording with Adobe Audition or WaveSurferAdobe Audition Temporal View of a Good V.22 Transaction Audio Playback and AnalysisAdobe Audition Spectral View of a Good V.22 Transaction Band Spectral Display Recording Made at Excessive Level Audio-Recording PitfallsAppearance of Bell 212 Protocol Details of Some Low-Speed ProtocolsAppearance of V.22 bis Protocol Appearance of V.29 FastPOS Protocol Examples of Epos Server Misbehavior Example of Epos Server Misbehavior Dtmf Distorted by Low Line Level Examples of Line ImpairmentsPower Line Related Noise Appendix C-PARALLEL/SPI Interface Software Implementation MCU  MCUhardware.c  modemhardware.c Hardware Access LayerInterrupt Service and Polling Layer Software DescriptionPolling HIR1 Method Interrupt Service Routine ISR MethodRXF Interrupt Receive Fifo Almost Full TXE Interrupt Transmit Fifo Almost Empty Timer Interrupt Receive Fifo Not EmptyU70 Interrupt Parallel- or SPI-Port Interrupt-Service Flowchart Buffer Management Buffer Management, Status and Control LayerCircular-Buffer Flowchart Status and Control Application Layer Sample ApplicationData Bursts Compiler Option Dot CommandsModem Operation Making a ConnectionSfrpagesave = Sfrpage Modem Interrupt Service Sample CodeRev 301 302 Revision 0.8 to Revision Revision 0.5 to RevisionRevision 0.6 to Revision Revision 0.7 to RevisionContact Information