Multi-Tech Systems MT2834ZPX File Transfer Protocols, When to Disable Data Compression

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Chapter 3 - Software Configuration

File Transfer Protocols

When you upload or download files with your modem, the host computer will ask which file transfer protocol you want to use. Most communications programs allow you to choose a default protocol. Your software’s documentation should list the ones it can use (not all communications programs support all protocols). Zmodem is the default protocol in MultiExpress for Windows, and we recommend it for most transfers. The following is the MEW File Transfer Protocols screen:

Figure 3-4. MEW File Transfer Protocols Screen

When to Disable Data Compression

The speed advantage hardware compression gives you is entirely dependent on how much the data being transmitted can be compressed. If the data is already in compressed form—a .ZIP or a

.SIT file, for example—trying to compress it more will actually slow the transmission slightly compared to transmitting the same file with compression disabled. This effect will be most noticeable if your modem negotiates MNP 5 compression with the other modem. V.42bis will not try to further compress a compressed file, but MNP 5 will.

The command to disable compression is AT &E14 <CR>. If you use your modem mostly for downloading long, compressed files from BBSs, you may want to include the &E14 command in your initialization string as follows:

AT &F S0=0 X4 &E14 ^M

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Contents Page Record of Revisions Revision Description Contents Index Introduction and Description Modem Features Product Description Fax FeaturesAT Commands and S-Registers How to Use This ManualInstallation and Connection Software ConfigurationService, Warranty & Technical Support/ BBS Testing Your ModemAppendices Safety Warnings Installation and ConfigurationConfiguration and Installation Procedure StepProcedure Configuration/Installation ProcedureInstallation and Configuration Is Your MT2834ZPX Ready for Use? Operating Your MT2834ZPX Simple Operations Configuring Software for Your Modem Software Configuration IntroductionAT &F X4 S0= 2 M PC Initialization StringsConfiguring Software for Your Computer Changing Default ParametersTerminal Emulation Configuring Software for the Remote SystemFile Transfer Protocols When to Disable Data CompressionAT &F S0=0 X4 &E14 M 16550 Uart and Windows Disabling Error CorrectionAT &F S0=0 X4 &E0 M COM2FIFO=1 COMnFIFO=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 Procedures Remote ConfigurationRemote Configuration Operation Procedures StepProcedure Contd. Remote Configuration Operation Procedures Password CommandsEscape Code Character RegistersReturn Character Pause Time for Comma S13 Remote Configuration Escape Character S29 Local Inactivity Timer S36 Time Between DTR Inactive and Modem Off-Hook Q0 Multi-Tech Result Codes Result CodesQ1 Standard AT Result Codes AT Commands and S-Register Summary Modem Does Not Respond to Commands TroubleshootingPage Modem Dials But Cannot Make a Connection Page Modem Disconnects While Online File Transfer Is Slower Than It Should Be Modem Cannot Connect When AnsweringLosing Data Fax and Communications Software Won’t Run at the Same Time Getting Garbage Characters on the MonitorLocal Analog Loopback Test Testing Your Modem Local Analog Loopback Test/V.54 LoopDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Test local/manual Digital Loopback Test/V.54 Loop 2 Remote/ AutomaticDigital Loopback Test remote/automatic Limited Warranty Service, Warranty and Tech Support IntroductionTech Support On-line Warranty RegistrationRecording Modem Information Service If you know the file name About the Multi-Tech BBSTo log on to the Multi-Tech BBS To Download a fileIf you don’t know the file name About CompuServe/Internet About the Multi-Tech Fax-Back ServiceAppendix a Technical Specifications Fax Modulations Intelligent FeaturesCommand Buffer ModulationCarrier Frequencies BpsBell Standard Carrier FrequenciesDataCarrier Frequencies Dimensions ConnectorsDiagnostics Temperature Power Consumption697 770 852 941 1209 Digits 1336 1477 1633 Appendix B Tone Dial FrequenciesAppendix 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