Multi-Tech Systems MT2834ZPX owner manual Modem Cannot Connect When Answering, Losing Data

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MT2834ZPX Owner's Manual

The Modem Cannot Connect When Answering

Auto-answer may be disabled. Turn on auto-answer in your datacomm program or send the command ATS0=1 to your modem in terminal mode.

File Transfer Is Slower Than It Should Be

If you are using a slow transfer protocol, such as Xmodem or Kermit, try Zmodem or Ymodem/G instead.

Is your line noisy? If there is static on your line, the modem has to resend many blocks of data to insure accuracy. You must have a clean line for maximum speed.

Are you downloading a compressed file with MNP 5 hardware compression enabled? Since hardware data compression cannot compress a file already compressed by an archiving program, the transfer can be marginally slower with data compression enabled than with it disabled.

Try entering the L8 (List Online Diagnostics) command in online mode, making a screen print of the diagnostics listing, and checking for parameters that may be unacceptable (number of retrains, round trip delay, etc.).

Losing Data

If you are using data compression and a high speed serial port, set the serial port baud rate to four times the data rate.

Make sure the flow control method you selected in software matches the method selected in the modem. If you have a Macintosh, you may have the wrong cable for hardware flow control.

If you are running under Windows 3.1 and have a 16550AFN UART, you may need to turn on the 16550’s data buffers and/or replace the Windows serial driver, COMM.DRV.

Try entering the L8 (List Online Diagnostics) command in online mode, making a screen print of the diagnostics listing, and checking for parameters that may be unacceptable (number of retrains, round trip delay, etc.).

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Contents Page Record of Revisions Revision Description Contents Index Introduction and Description Modem Features Fax Features Product DescriptionSoftware Configuration How to Use This ManualInstallation and Connection AT Commands and S-RegistersTesting Your Modem Service, Warranty & Technical Support/ BBSAppendices Installation and Configuration Safety WarningsConfiguration/Installation Procedure Configuration and Installation Procedure StepProcedureInstallation and Configuration Is Your MT2834ZPX Ready for Use? Operating Your MT2834ZPX Simple Operations Software Configuration Introduction Configuring Software for Your ModemPC Initialization Strings AT &F X4 S0= 2 MChanging Default Parameters Configuring Software for Your ComputerConfiguring Software for the Remote System Terminal EmulationWhen to Disable Data Compression File Transfer ProtocolsAT &F S0=0 X4 &E14 M Disabling Error Correction 16550 Uart and WindowsAT &F S0=0 X4 &E0 M COMnFIFO=1 COM2FIFO=1Page Modem AT Commands Command a Default $BA0 Description Command Values Default $EB0 Description =0 thru $Fn Command Values Default Command Values Default Description Default &P1 Description RFn Command T = 0, 1, 2, or Values Default Description Command @ Remote Configuration Remote Configuration ProceduresRemote Configuration Operation Procedures StepProcedure Password Commands Contd. Remote Configuration Operation ProceduresRegisters Escape Code CharacterReturn Character Pause Time for Comma S13 Remote Configuration Escape Character S29 Local Inactivity Timer S36 Time Between DTR Inactive and Modem Off-Hook Result Codes Q0 Multi-Tech Result CodesQ1 Standard AT Result Codes AT Commands and S-Register Summary Troubleshooting Modem Does Not Respond to CommandsPage Modem Dials But Cannot Make a Connection Page Modem Disconnects While Online Modem Cannot Connect When Answering File Transfer Is Slower Than It Should BeLosing Data Getting Garbage Characters on the Monitor Fax and Communications Software Won’t Run at the Same TimeTesting Your Modem Local Analog Loopback Test/V.54 Loop Local Analog Loopback TestDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Test/V.54 Loop 2 Remote/ Automatic Digital Loopback Test local/manualDigital Loopback Test remote/automatic Service, Warranty and Tech Support Introduction Limited WarrantyOn-line Warranty Registration Tech SupportRecording Modem Information Service To Download a file About the Multi-Tech BBSTo log on to the Multi-Tech BBS If you know the file nameIf you don’t know the file name About the Multi-Tech Fax-Back Service About CompuServe/InternetAppendix a Technical Specifications Modulation Intelligent FeaturesCommand Buffer Fax ModulationsCarrier FrequenciesData Carrier Frequencies BpsBell StandardCarrier Frequencies Temperature Power Consumption ConnectorsDiagnostics DimensionsAppendix B Tone Dial Frequencies 697 770 852 941 1209 Digits 1336 1477 1633Appendix C FCC and Canadian Regulations RJ11C or RJ11W single line Appendix C FCC and Canadian Regulations Canadian Limitations Notice Index 15, 19 In-band Escape Sequence MultiExpress for Windows PBX/CBX Disconnect Drop Time for DSR/CTS/CD Rings Which Have Occurred Registers Serial port 17, 20, 21 17, 19