Multi-Tech Systems MT5600BL Data Is Being Lost, There Are Garbage4 Characters on the Monitor

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8 Solving Problems

Data Is Being Lost

If you are using data compression and a high speed serial port, set the serial port

4baud rate to four times the data rate.

Your UART might not be reliable at serial port speeds over 9600 bps or 19,200 bps. Turn off data compression, reset your serial port speed to a lower rate, or

4replace your serial port with a faster one.

Make sure the flow control method you selected in software matches the method selected in the modem. If you are using the modem with a Macintosh, you might

4have the wrong cable for hardware flow control.

If you are running under Windows 3.1 and have a 16550AFN UART, you might need to turn on the 16550’s data buffers and/or replace the Windows serial driv-

4er, COMM.DRV.

Try entering the &V1 command to display information about the last connection, making a screen print of the connection statistics, and checking for parameters that might be unacceptable.

There Are Garbage4 Characters on the Monitor

Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software.

You might be experiencing line noise. Enable error correction, if it is disabled, or

4hang up and call again; you might get a better connection the second time.

At speeds above 2400 bps, the remote modem might not use the same transmis- sion or error correction standards as your modem. Try connecting at a slower speed or disabling error correction. (With no error correction, however, line noise

4can cause garbage characters.)

Try entering the &V1 command to display information about the last connection, making a screen print of the connection statistics, and checking for parameters that might be unacceptable.

The Modem4Doesn’t Work with Caller ID

Caller ID information is transmitted between the first and second rings, so if autoanswer is turned off (S0=0) or if the modem is set to answer after only one ring (S0=1), the modem will not receive Caller ID information. Check your ini- tialization string, and if necessary change it to set the modem to answer after the

4second ring (S0=2).

Make sure that you have Caller ID service from your telephone company.

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Contents Model MT5600BA Model MT5600BL Record of Revisions FCC Part Introduction Using the Front PanelQuick Start MultiModemII User GuideRemote Configuration AT Commands, S-Registers & Result CodesSolving Problems Callback SecurityAppendix a Regulatory Compliance Appendix D Warranty, Service, and Technical SupportAppendix C Loopback Tests Appendix E Upgrading the ModemContents Viii Introduction Product Description FeaturesIntroduction Data IntroductionRelated Manuals What Is in Your Modem Package?Quick Start What You Will Need Safety WarningsWe supply You supplyRS232 Connection Connect the Modem to Your SystemDialup Connection Quick StartFour-Wire Leased Line Connection Two-Wire Leased Line ConnectionPower Connection Power-On TestRemoving Your Old Modem from Windows Install the Modem in WindowsAdding the Modem to Windows Install and Configure Your Software Trio DataComm Call the Multi-Tech BBSWindows HyperTerminal Windows Terminal Microsoft Fax Send a FaxTrio Fax References Select Start Programs Accessories Fax Compose new faxMultiModemII User Guide Using the Front Panel LED Indicators Modem ConfigurationLiquid Crystal Display LCD Using the Front PanelOption Selection Menu StructureMultiModemII User Guide Menu Overview Using the Front Panel Status Trunk MultiModemII User Guide Basic Options Trunk Using the Front Panel Advanced Options Trunk Diagnostic Options Trunk MultiModemII User Guide Remote Configuration Options TrunkCaller ID Options Trunk Using the Front Panel Phone Number Memory Options TrunkStatus Menu OptionsUsing the Front Panel Basic Options Implemented Advanced OptionsRemote Configuration Options Caller ID Options MultiModemII User Guide Diagnostic OptionsPhone Number Memory Options AT Commands Registers Result Codes Introduction AT Commands, S-Registers, and Result Codes AT CommandsDS= y Dial Stored Telephone Number Echo Command Mode CharactersHook Control Information RequestMonitor Speaker Mode Monitor Speaker VolumeReturn Online to Data Mode Result Codes Enable/DisableSet Register Value Select RegisterRead Register Value Tone DialingResult Code Selection Modem ResetLong Space Disconnect Data Carrier Detect DCD ControlLoad Factory Settings Error Correction ModesData Terminal Ready DTR Control Modem-Initiated Flow ControlFlow Control Selection Communications Mode22bis Guard Tone Control Test Commands Sync/Async ModeClear to Send CTS Control Data Set Ready DSR ControlStore Current Configuration Display Current ConfigurationDisplay Last Connection Statistics Synchronous Clock SourceLine Signal Level Select Profile for Hard ResetZy =x Store Telephone Number Data Compression ControlPCM Code Selection Line Signal Quality\An Maximum MNP Block Size \Bn Transmit Break\Vn Single Line Connect Message \Nn Error Correction Mode SelectionReserved,maxTXrateCR +MS= Modulation SelectionMNP Extended Services Command #CBNy=x Store Callback Number Command -SDR=nDistinctive Ring ControlCommand #CBPy=x Store Callback Password Flash Memory DownloadCallback Enable/Disable Command #CID= n Caller IDCommand $SBn Serial Port Baud Rate Escape SequenceRegisters Register Unit Range Default DescriptionS32 S36 S46 Terse Verbose Description Result CodesProtocol ALT +FCERROR MultiModemII User Guide Remote Configuration Changing the Remote Configuration Password Basic ProcedureSetup Changing the Remote Escape Character Remote ConfigurationMultiModemII User Guide Callback Security Turning Callback Security On and Off Setup ProceduresCallback Security Assigning Callback PasswordsAssigning Callback Phone Numbers Command #CBN y= x Store Callback Number Calling ProcedureCallback Security Commands Command #CBPy=x Store Callback Password Callback Assignments MultiModemII User Guide Leased Line Operation Two-Wire Setup Leased Line Operation Four-Wire SetupDial Backup and Leased Line Restoral Setup Dial Backup and Leased Line RestoralLeased Line Operation MultiModemII User Guide Solving Problems None of the Indicators Light Solving Problems Modem Does Not Respond to CommandsModem Dials But Cannot Connect Modem4Disconnects While Online File Transfer4Is Slower Than It Should Be Modem4Cannot Connect When AnsweringModem4Doesn’t Work with Caller ID Data Is Being LostThere Are Garbage4 Characters on the Monitor Fax and Data4Software Can’t Run at the Same Time Appendixes FCC Part 68 Telecom Appendix a Regulatory ComplianceRegulatory Compliance Fax Branding StatementCommission Decision CTR21 Canadian Limitations NoticeInternational Modem Restrictions New Zealand Telecom Warning Notice EMC, Safety, and Terminal Directive ComplianceAppendix B Technical Specifications Technical Specifications Receiver Sensitivity Loopback Tests Test procedureLocal Analog Loopback Test V.54 Loop Figure C-2. Remote digital loopback test Remote Digital Loopback Test V.54 LoopFigure C-3. Local digital loopback test Local Digital Loopback Test V.54 LoopBack-to-Back Test Figure C-5. Back-to-back test connections Service Limited WarrantyWarranty, Service, and Technical Support Online Warranty RegistrationTechnical Support Multi-Tech BBSAbout the Internet SupplyNet Online Ordering Instructions Ordering Modem AccessoriesIdentify the Modem Firmware Upgrade OverviewMulti-Tech Web Site Identify the Current Firmware VersionMulti-Tech BBS Upgrading the ModemSet the Modem to the Factory Defaults Download the Upgrade FileExtract the Upgrade Files Restore Your Parameters Upgrade the Modem’s FirmwareRS-232 Pinouts Appendix F Cable PinoutsCable Pinouts Leased Line PinoutsCtrl Code Hex Dec Appendix G Ascii Character MapIndex 108 Index 110

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