Silicon Laboratories SI2493/57/34/15/04, SI2494/39 specs

AN93

Examples of Line Impairments

DTMF Distorted by Low Line Level

Figure 71. Defective DTMF

Figure 72. Normal DTMF

Solutions:

Fix the telephone line.

Lower the DTMF level with AT:U46, 0BD0 or AT:U46, 0CF0

Check the loop-current level with AT:R79 and AT:R6C.

288

Rev. 1.3

Image 288

Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual Examples of Line Impairments, Dtmf Distorted by Low Line Level

Contents

Functional Block Diagram Introduction AN93 Table of Contents AN93 AN93 AN93 AN93 Document Change List Contact Information Selection Guide ModulationsProtocols Protocol Function Si2494/93 Si2457 Si2439/34 Si2415 Si2404 Carriers and Tones ISOmodem CapabilitiesRelease Part Numbers Package Resetting the Device Reset SequenceModem System-Side Device Reset Strapping General Considerations SOIC-16 Reset-Strap Options Reset-Strap Options for 16-Pin Soic PackageMode Reset-Strap Pins Interface Input Clock Pin 5, RXD/MISO Reset-Strap Options for 24-Pin Tssop Package TSSOP-24 UART-Interface Options TSSOP-24 Parallel-Interface Options Reset Strapping Options for QFN Parts with Uart Operation TSSOP-24 SPI-Interface Clock-Frequency Options Reset Strapping Options for QFN parts with SPI Operation Input Clk Pin Functions vs. Interface Mode SOIC-16 Pin Functions vs. Interface Mode TSSOP-24System Interface Pin Functions vs. Interface Mode QFN-38 UART-Interface Signals SPI-Interface SignalsParallel-Interface Signals Ideal DTE Rate bps Actual DTE Rate bps Approximate Error% DTE Rates Serial Formats Detected in Autobaud Mode Symbol Data bits Parity Stop bitsFlow Control Can Monitor U70 Bit FunctionPPD OCD Uart Serial Interface Parallel and SPI Interface Operation TX Fifo Hardware Interface Register Bit Map Hardware Interface Register Parallel Interface Signals Signal Function DirectionParallel Interface Operation Parallel Interface Read Timing Bit Function Meaning when High Meaning when Low SPI Control-and-Address Bit DefinitionsSPI Interface Operation Interface Communication Modes Low-Power Modes Power-Down ModeWake-on-Ring Mode Sleep Mode SSI/Voice Mode 24-Pin Tssop and 38-Pin QFN Only Signal Pin Number TSSOP-24 QFN-38Clkout Fsync SDI SDO Reset SSI Interface Pin Connection Eeprom Commands Eeprom Interface 24-Pin Tssop and 38-Pin QFN OnlyEeprom Status Register Any Other Bits are Unused Eeprom Timing Parameter Symbol Min Typ Max Unit EOZEcsh Eecs Three-Wire SPI Interface to Eeprom Boot Commands Custom DefaultsDetailed Eeprom Examples Eeprom AT Command Macros Customized AT Commands Firmware UpgradesBoot Command Example AT Command Macro Example Autoloading Firmware Upgrade Example Command Function Combination ExampleCombination Example Ascii Chart Dec Hex Display Hookswitch and DC Termination DAA Line-Side Device AC Termination Settings for the Si3018 Line-Side Device AC TerminationRinger Impedance and Threshold Pulse Dialing and Spark Quenching Typical Loop Voltage LVS Transfer Function Ilim = Loop Current Transfer FunctionLVCS40 Condition Legacy-Mode Line Voltage and Loop Current Measurement Billing Tone Detection Power Supply and Bias Circuitry Hookswitch and DC TerminationHardware Design Reference Component Functions Ringer Network Optional Billing-Tone Filter Symbol Value TIP From Line Ring DAA EMI/EMC Schematic Si3018/10 Schematic Bill of Materials Component Value Suppliers Layout Guidelines Reference Placement Layout Checklist ISOmodem Layout Check ListLayout Items Required AN93 Module Design and Application Considerations Module DesignMotherboard Design Modem Module VCC and Reset Filter Analog Output Audio Filter Response Audio Quality Modem Reference Guide Controller AT Command Set Configuration StatusCommand Action DSP Command Examples Multiple AT Commands on a Single LineCommand Result Comment Command Result Basic AT Command Set Consecutive U-Register Writes on a Single Line Enable No Patch AT Command Chip RevisionModifier ATI0 ATI1 AT Command Chip Revision Revision B Patch rbpXYYYYRevision C Patch rcpXYYYY ATI0 Enable result codes See Table Speaker is always off Command Action Verbal result codes Program RAM write this command is used to upload firmware Disabled +DR=X+DRNONE +DRV42B RD Specifies the mode of operation when initiating a modem Connection = Disable synchronous access modeSpecifies the mode of operation when answer a modem C,D = CRC generation checking disable = Nrzi encoding and decoding disabledSpecifies action taken if an underrun condition occurs During transparent sub-mode Class 1 Transmit Carrier United States default Country +GCI? Fixed DTE RateAutomatically detect the baud rate BPS V22B ITU-T V.22bis default for Si2404 V32B ITU-T V.32bis default for Si2415ITU-T V.34 default for Si2434 ITU-T V.90 default for Si2457 Enable Short Phase 1 and Short Phase +PMHR=X+PMHT=X +PQC=X DCEs decide to use short startup procedures = After ring only= Off Distinctive Ring Command Action Transmit Gain Selection Load Voice Factory DefaultsDTE/DCE Inactivity Timer ISOmodem on-hook. Aout disabled. Tone detec Ringing Tone Goes Away Timer Ringing Tone Never Appeared TimerOK result code. Default time is 0 seconds Is five seconds Speakerphone AEC, AES and LEC disabled Dtmf / Tone Duration TimerVoice Compression Method Signed PCM Extended AT Commands Extended AT& Command SetKbps max default for Si2415 Kbps max default for Si2457 transmit and Si2434 Only 56 kbps to 28 kbps TIP + Extended AT% Command Set Enable V.42bis in transmit and receive pathsISOmodem answers a call in answer mode Disable automatic line-in-use detection Extended AT\ Command Set Mode is not allowed with a parallel or SPI interface \P0 Even \Q2 Use CTS only \T9 Kbps4 \T16 Autobaud On4\V0 Report connect and protocol message Result Codes Numeric1 Meaning Verbal Response Stas Polarity ReversalNo Polarity Reversal Protocol None ALTERNATE, +CLASS UN-OBTAINABLE Number Disconnect Codes Disconnect Code Reason Definition Register Function Default Range Units Decimal RegistersRegister Descriptions Ascii All spaces 0s 2400 Symbols/second Symbol Rate Allowable Data Rates Register Address Name Description Default Hex U0F DT4A0DT4B1 DT4B2 U2E BmttU2F Bdlt U4E PrddU4F FHT V9AGG SamcoSasf SC0 Bit-Mapped U-Register Summary Register Summary Register Name Description Default U0-U16 Dial Tone Registers2. U00-U16 Dial Tone Detect Filter Registers U17-U30 Busy Tone Detect Registers 3. U17-U30 Busy Tone Detect Filter Registers 310/510 Default Busy and Dial Tone BPF Biquad Stage Output Scalar300/480 320/630 BPF Biquad Values 400/440 Ringback Cadence Registers Dial Tone Timing Register4. U31-U33 Ringback Cadence Registers 5. U34-U35 Dial Tone Timing Register Pulse Dial Registers Dtmf Dial Registers7. U46-U48 Dtmf Dial Registers Ring Detect Registers 8. U49-U4C Ring Detect Registers9. U4D Modem Control Register 1-MOD1 Register U4D Bit Map Pre-Dial Delay Timer Register Flash Hook Time RegisterLoop Current Debounce Registers Transmit Level Register U53 Bit Map U54 Bit MapU62 Bit Map U63 Bit Map U65 Bit Map Line-Side Chip Power Down 17. U67-U6A International Configuration RegistersPDL = Normal operation U66 Bit Map U67 Bit Map U68 Bit Map U6A Bit Map U6C Bit Map18. U6C Line-Voltage Status Register 19. U6E-U7D Modem Control and Interface Registers U6E Bit Map U6F Bit MapPtmr U70 Bit Map Type Reset settings = Bit Disables PCM mode Enables PCM modeU71 IO1 Bit D15 D14 D13 D12 D11 D10 Name Function 155 Reserved Read returns zero U76 Bit Map U77 Bit Map Monitor Mode Values U78 Bit MapU79 Bit Map U7A Bit Map = Normal Atdtw operationAdaptive Dialing Synchronous Mode = Normal asynchronous modePin indicates valid ring signal Given time = Disables No Loop Current Detect = Timed calibration disabled= ATZ enabled 20. U80 Transmit Delay for V.22 Fast Connect Special Error Reporting Mode = Ignore unrecognized in-band commandsMinimal Transparency Framed Sub-Mode Startup Firmware Upgrades Patch, 115 kbaud Uart Lines Reset, then Escape MethodsLoad Technique and Speed Table Method 1. +++ Escape Th Bit EscapeEscape Pin Escape Error Correction Wire ModeEnabling Error Correction/Data Compression To Enable Use AT Commands Legacy Synchronous DCE Mode/V.80 Synchronous Access Mode 15. V.80 ModeSynchronous Mode Overview Epos Electronic Point of Sale Applications Synchronous Access Mode Settings AT\N0 Command Hex Supported Transmit Direction Receive Direction Indicator pair Code Transparent SubmodeCRC EM In-Band Commands and Statuses Fast Connect Settings CommandSupported Transmit Direction Receive Direction Code Transparent Submode ATDT12345 Connect 1200 Protocol None 0x190x190x110x11 Modem Feature vs. Hardware, AT Command and Register Setting Function/Feature AT Commands RegistersProgramming Examples Quick Reference Country-Dependent Setup DC Termination Control BitsDC Termination Reg Bit Val Function Country Configuration Country Initialization TableCountry Initialization Table Country Initialization AT+GCI=A AT+GCI=FAT+GCI=16 AT+GCI=9C AT+GCI=26 AT+GCI=27AT+GCI=31 AT+GCI=6C AT+GCI=3C AT+GCI=3DAT+GCI=42 AT+GCI=46 AT+GCI=53AT+GCI=57 AT+GCI=58 AT+GCI=59 AT+GCI=0AT+GCI=61 AT+GCI=9F AT+GCI=69 AT+GCI=7B AT+GCI=7E AT+GCI=82AT+GCI=89 AT+GCI=87 AT+GCI=B8 AT+GCI=A0 AT+GCI=A5 AT+GCI=A6AT+GCI=FE UAE AT+GCI=B4 International Call Progress Registers Dial Registers Line Interface/Control Registers AT Command Function Special Requirements for Serbia and MontenegroBlacklisting S42 Blacklisting Caller ID Caller ID Modes SMS Commands SMS SupportJapan Caller ID Protocol 150 Type II Caller ID/SAS Detection Mdmf ParametersCharacter Description Hexadecimal Value Ascii Value Johndoe SAS Tone Frequency SAS Cadence for Supported Countries Country Tone Frequency Hz Cadence seconds Registers ArubaAustralia Austria Country Tone Frequency Hz Cadence seconds Registers China CroatiaCyprus Czech Republic Greece GuyanaHonduras Hong Kong Israel Japan064 0.436 Jordan Kiribati Korea RepublicLao P.D.R Lithuania Nigeria OmanPapua New Guinea Paraguay Country Tone Frequency Hz Cadence seconds Registers Russia St.-Kitts-and-NevisSt. Lucia Saudi Arabia Sweden TajikistanTrinidad Tobago Intrusion/Parallel Phone Detection On-Hook ConditionLine Not Present/In Use Indication Method 1-Fixed Loop Voltage Action Line Not Present/In Use Indication Method 2-Adaptive Off-Hook Condition Intrusion Detection Register Bits Name FunctionATH1 Possible Responses to Pmhr Command from Remote Modem Modem-On-HoldInitiating Modem-On-Hold Value Description Hdlc Bit Errors on a Noisy Line Receiving Modem-On-Hold Requests Bit Errors DCEBeginning of Packet Bit Errors Data Meaning 0D 0A 4E 4F 20 43 52 49 45 52 0D 0A Overcurrent Detection Pulse/Tone Dial DecisionOvercurrent Detection Register Bit Value Function Automatic Phone Line Configuration Telephone Voting Mode Possible +PMHT Settings12. V.92 Quick Connect AT+PQC Parameters AT+PSS Parameters Extended AT+ Command Set Handset, TAM, and Speakerphone OperationSoftware Reference Command Action Caller ID Type Caller ID EnableAfter ring only Distinctive Ring Cadence Reporting Command Action Analog Source / Destination Selection Command Action Ringing Tone Never Appeared Timer Speakerphone AEC, AES and LEC disabled. Handset FIR filter+VTS command. Default time is 1 second dur = Compression Selection Method Command Action Dtmf and Tone Generation Transmit Voice Stream DLE Commands DTE-to-DCE DLE Commands DTE-to-DCECode Hex Simple Action Command Description Format DLECode DLE Simple Events DCE-to-DTE DLE Events DCE-to-DTE Simple Event ReportingCode Hex Description SUB 180 Voice Mode U Registers Address Description DefaultComplex Event Reporting Format DLEXResponseDLE Description Voice Mode U Registers Register Address Name Description Default HRXFIR1 HRXFIR2HRXFIR3 HRXFIR4 STXFIR1 STXFIR2STXFIR3 STXFIR4 SRXFIR1 SRXFIR2SRXFIR3 SRXFIR4 U19E U199 Bit Definitions Voice Reference-Overview TAM, Handset, and Speakerphone Voice Paths Rev 189 Voice Mode Operations +FCLASS=8 +VTX +VRX +VSP +VTS Input Current Modem Settings Command or Event +VNH = ATH orDTR off &D2 ATZ or Si3000 Configuration System Voice Modes TAM Pstn Initialization Initialization Sequence Rev 195 Handset Configuration HandsetOverview AT+VLS=0 AT+VLS=13AT+VSP=0 Handset Automatic Tone Dial Handset Manual Off-Hook DialHandset Automatic Pulse Dial Handset to TAM Hands-Free Transition TerminateAT+VLS=14 Handset to Speakerphone Transition Speakerphone TransitionAT+VSP=1 Telephone Answering Machine Local Ring Notification with Type I CID EventNAME=JONES Jennifer TAM Hands-Free Record OGM Record OGMATU199&FFFD AT+VRX Connect TAM Hands-Free Review OGM Review OGMRecord Local ICM Review ICM TAM Handset Record OGM Trigger receive operation. The first byte TAM Handset Review OGM AT+VSM=4 TAM Pstn Normal Answer OGM Playback with ICM Record Normal Answer OGM Playback with ICM Record AT+VLS=15 ICM Interrupted Answer OGM Playback with Dtmf Menu Entry DLE1 Dtmf 1 digit detected Speakerphone Simplex Speakerphone Register Name Description Default Value Transmit Gain Calibration-Speakerphone DisabledSimplex Speakerphone U Registers External Microphone/Speaker Calibration Transmit Gain Configuration Transmit/Receive Gain Calibration Dial Remote Telephone AT+FCLASS=8 Receive Gain Configuration Receive Gain Reference Measurements Speakerphone Calibration-AEC Gain Calibration Reg Name Bit U19E AEC Gain Calibration Dial Remote Telephone Speakerphone Configuration Speakerphone Configuration Simplex Speakerphone Configuration Simplex Speakerphone Configuration Speakerphone Automatic Tone DialSpeakerphone Manual Off-Hook Dial Call-Automatic Tone Dial Speakerphone Automatic Pulse Dial Speakerphone to Handset TransitionCall-Automatic Pulse Dial Glossary ReferencesTermination Security Protocols Implementing the SIA Protocol Considerations when Disconnecting the Session AT+F0 AT+F1 AT+F2AT+F3 AT+F4 Result Code Meaning Remarks Implementing the Ademco Contact ID Protocol Ademco Contact ID Protocol Tone Transmission AT Commands Dtmf Digit Low Tone Hz High Tone Hz Contact ID AT CommandModem Specific Implementation Details Kissoff Ademco Mode of Operation Step DTE-to-Modem Command Modem-to-DTE Remarks IndicationHandshake Tone Detection Event Modem-to-DTE indication Remarks Delay 250 ms before transmitting Data Tones Wait for Receiver to answer with handshake tonesMessage Wait for Kissoff tone ATH Rev 233 Chinese ePOS SMS SMS Message Format SMS AT Command Set AT Commands for SMSAT Command ISOmodem Response Description +FCLASS=256 Register Bits Name Description Default Hex = Auto ModeUser Registers for SMS Operations SMS User Registers Procedure ExampleCrlfconnect Crlf Response Dleetxcrlfno CarriercrlfConnect 1CRLF Connect 2CRLF Example Session Dleetxcrlfokcrlf POS SMS Process in Host and Modem Testing and Diagnostics Prototype Bring-Up Si3018/10  Inappropriate Commands  Command Timing Register Configurations Host Interface Troubleshooting Isolation Capacitor Troubleshooting 10.1.6. Si3018/10 TroubleshootingComponent Troubleshooting  Connect Evaluation Board to Prototype System Test the Host Interface EVB Test the Prototype Si3018/10 Circuitry Si3018/10 Typical Voltages Resistance to Si3018/10 Pin Si3018/10 Resistance Resistance across Components Voltages across Components with Diode CheckerFB1 FB2 RV1 Component Voltage Self Test Loop Test Circuit Board Test Bell 103-V.34 Modem Functional Test Connection Teltone ILS Isdn ModemModem Under Test Test Coverage Compliance Testing AT Commands for Compliance TestingAT Command/Test Method Desired Response Symbol/Data Rate S41 Symbol Rate Allowable Data Rates29 Data Rate Transmit Modulation Data Rate Safety Surges AM-Band Interference Published Coilcraft TRF-RJ11 Filter Performance Debugging the DTE interface Debugging the DTE Interface Appendix A-EPOS Applications Modulation Recommendation 0xFF 0x19 0xA0 0x19 0xB1 ISOmodem in Epos Applications ISOmodem V.80 Protocol Hdlc Framing in Framed Sub-Mode Setup procedure 29 FastPOS Sample ProgramAT&D2 AT+FCLASS=1 How to use the program Example Program in C/C++ Rev 263 264 Rev 265 True Rev 267 = Rtscontrolenable Rev 269 270 RTS not RTS signal FastPOS Detailed Wave Files FastPOS DTE Trace When to Use Audio Recording Times When Audio Recording May Not HelpHardware Setup Setting PC Microphone Input for Recording Windows NT Larger of the two jacks 3.5 mm carries audio to the PC Setting PC Microphone Input for Recording Windows Sounds and Multimedia Properties Setting PC Microphone Input for Recording Windows XP Multimedia Properties Sounds and Audio Devices Properties Making the Recording with Adobe Audition or WaveSurfer Sound Recorder Audio Playback and Analysis Adobe Audition Temporal View of a Good V.22 Transaction Adobe Audition Spectral View of a Good V.22 Transaction Band Spectral Display Audio-Recording Pitfalls Recording Made at Excessive Level Details of Some Low-Speed Protocols Appearance of Bell 212 Protocol Appearance of V.22 bis Protocol Appearance of V.29 FastPOS Protocol Examples of Epos Server Misbehavior Example of Epos Server Misbehavior Examples of Line Impairments Dtmf Distorted by Low Line Level Power Line Related Noise Appendix C-PARALLEL/SPI Interface Software Implementation MCU Hardware Access Layer Interrupt Service and Polling LayerSoftware Description  MCUhardware.c  modemhardware.c Interrupt Service Routine ISR Method Polling HIR1 MethodRXF Interrupt Receive Fifo Almost Full Timer Interrupt Receive Fifo Not Empty TXE Interrupt Transmit Fifo Almost EmptyU70 Interrupt Parallel- or SPI-Port Interrupt-Service Flowchart Buffer Management, Status and Control Layer Buffer Management Circular-Buffer Flowchart Application Layer Sample Application Status and Control Compiler Option Dot Commands Modem OperationMaking a Connection Data Bursts Modem Interrupt Service Sample Code Sfrpagesave = Sfrpage Rev 301 302 Revision 0.5 to Revision Revision 0.6 to RevisionRevision 0.7 to Revision Revision 0.8 to Revision Contact Information