Multi-Tech Systems MT5634ZPX-PCI owner manual Modem dials but cannot make a connection

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4 Troubleshooting

The modem dials but cannot make a connection

Several reasons why the MultiModemZPX-PCI fails to make a connection include

•Lack of a physical connection to the telephone line.

•A wrong dial tone.

•A busy signal.

•A wrong number.

•No modem at the other end.

•A faulty modem, computer, or software at the other end.

•Incompatibility between modems.

Narrow the list of possibilities by using extended result codes. If you disabled the modem’s extended result codes, enable them by entering ATV1X4 in the terminal window and pressing ENTER. When you dial again, the modem reports the call’s progress.

•If the modem reports NO DIALTONE, check that the modem’s telephone line cable is connected to both the modem’s LINE jack (not the PHONE jack) and the telephone wall jack. If the cable looks secure, try replacing it.

If that doesn’t work, the problem may be in your building’s telephone installation. To test the building installation, plug a telephone into your modem’s telephone wall jack and listen for a dial tone. If you hear a dial tone, your modem may be installed behind a company phone system (PBX) with an internal dial tone that sounds different from the normal dial tone. In that case, the modem may not recognize the dial tone and may treat it as an error. Check your PBX manual to see if you can change the internal dial tone. If you can’t, change your modem’s initialization string to include X3, which makes the modem ignore dial tones.

•If the modem reports BUSY, the other number may be busy. Try again later. BUSY also may indicate that 9 was not added to the phone number (if required to dial 9 for an outside line).

If you are required to dial 9 to get an outside line, the easiest way to dial it automatically using legacy software is to include it in the modem’s dial prefix, e.g., ATDT9,. Note the comma. It inserts a pause before the number is dialed. For example, to change the dial

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Contents Model MT5634ZPX-PCI Record of Revisions MT5634ZPX -PCIContents Technical Support Introduction Initial Checklist Common ProblemsIntroduction Limited Warranty Data is being lostIntroduction and Description MT5634ZPX-PCI Introduction and Description FeaturesFax Peripiheral Component Interconnect PCIOptional V.8bis Sequence Support/FunctionsDownstream Rates Upstream Data RatesDigital Loss and Robbed-bit Signaling Auto Adapt What is in Your Modem Package?Appendix How to Use This ManualYou type this Typographic ConventionsInstallation What You’ll Need IntroductionInstallation Overview Safety WarningsInstallation Windows 95 Plug and Play Configuring the MultiModem ZPX-PCIInstalling the MultiModemZPX-PCI Plug the telephone’s line cable into External ConnectionsWith the modem, insert the microphone Verifying Configuration Installing DriversPort COM Interrupt Address Speed Is Your MultiModemZPX-PCI Ready for Use? Select Start, Settings, and then Control PanelTo Remove Previous Modem from Windows Simple Operation Operating Your MultiModemZPX-PCITesting Data Functions Software ConfigurationSelect Start, Programs, Accessories, and then HyperTerminal Connect dialog box, click Dialing Properties Click Start, Programs, Accessories, and then WordPad Testing FAX FunctionsMultiModemZPX-PCI’s fax capabilities Click Start, Programs, Accessories, and then HyperTerminal Testing Voice FunctionAT+FCLASS=8 AT+VLS=7 MultiModemZPX-PCI’s Speakerphone TestConfiguring Communications Software Installation Basic Procedure Remote ConfigurationChanging the Setup Password SetupPKUNZIP.EXE AT Commands, S-Registers, and Result Codes AT Commands Dial AT Commands, Result Codes, and S-RegistersCommunication Standard Setting Carrier ControlHook Control Echo Command Mode CharactersDS=n Dial Stored Telephone Number Echo Online Data CharactersModulation Handshake Monitor Speaker VolumeMonitor Speaker Mode Return Online to Data ModeResult Code Selection Sr=n Set Register ValueSr? Read Register Value Result Code FormatData Carrier Detect DCD Control Modem ResetLong Space Disconnect Auto Retrain22bis Guard Tone Control Fn Load Factory Default SettingsCommunications Mode Asynchronous Communications ModeSelect Stored Configuration for Hard Reset Self-Test CommandsView Current Configuration Store Current Configuration\Kn Set Break Control \Nn Error Correction Mode Selection\Gn Modem Port Flow Control \Jn Data Buffer ControlData Calling Tone \T n Inactivity Timer\V n Protocol Result Code \X n XON/XOFF Pass-ThroughAllowed value Enable Synchronous Buffered ModeSpeaker Codec Loopback Registers Minute 255 Decimal Disables, 1-255 enables Modulation50-150 Tones= disable 1 = enable Connect. Where K56flex provided=V.90/56Kflex disabled Data mode1-4 sets the value to S36=5,7 LAPM, MNP, or Async MNP or AsyncSets one of three 56K operating Result Codes Connected at 52000 bps Connected at 46000 bpsConnected at 48000 bps Connected at 50000 bpsTroubleshooting Initial Checklist Troubleshooting Common ProblemsMT5634ZPX-PCI Modem dials but cannot make a connection Modem disconnects while online Modem cannot connect when answering Data is being lost Warranty, Service, and Tech Support/BBS Limited Warranty Warranty, Service, and Tech Support Online Warranty RegistrationRecording Modem Information Technical SupportMulti-Tech Systems, Inc Woodale Drive Mounds View, MN ServiceIf you know the file name Multi-Tech BBSTo log on to the Multi-Tech BBS To Download a fileIf you don’t know the file name About CompuServe About the Multi-Tech Fax-Back ServiceAbout the Internet Appendix FCC Regulations for Telephone Line Interconnection Appendix a Regulatory ComplianceAppendix Fax Branding StatementMulti-Tech Systems, Inc Canadian Limitations Notice Appendix +12 VDC, -12 VDC, +5 VDC Product Safety ComplianceFigure A-1. Creepage and Clearance Distances European Low Voltage Directive EMC, Safety and Terminal Directive ComplianceNew Zealand Modem Warning Notice ITU Group 3, T.4, T.30, V.21, V.27ter Appendix B Technical Specifications14,400, 12,000, 9600, 7200, 4800, 2400, 90/K56flex, ITU V.34 extended, V.34, ITUAppendix Hz mark, 1850 Hz space for Transmit Fax Carrier FrequenciesConnectors Code HEX DEC Appendix C Ascii Conversion ChartIntroduction Appendix D FLASHWINFlash UpgradeMT5634ZPX-PCI Index BBS Data Enable/disable V25 data calling tone S35Index Auto RetrainFall-forward , 7 fallback , 7, 37 fax Fax-back service , 66 FCC Regulations , 68-81 firmwareTones dialing MT5634ZPX-PCI