Multi-Tech Systems MT3334ZDXV owner manual Digital Loopback Test remote/automatic

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4 - Testing Your Modem

5.Type data from your keyboard. For this test, typing multiple upper case "U" characters is a good way to send an alternating test pattern of ones and zeros. The data received by the remote modem will enter its analog receiver, be converted to digital data, be reconverted into analog, and then looped through its transmitter back to the local modem. Your modem passes this test if the data entered from the local keyboard is the same as the data received on your monitor.

Figure 4-3. Digital Loopback Test (remote/automatic)

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Contents Page Revision Description PatentsContents Index Computer Introduction and Description RequirementsSerial Cable Telephone LineProduct Features Communications SoftwareData About this Manual Installation and ConnectionFax Voice Model MT3334ZDXV onlyTesting Your Modem AT Commands, S-Registers and Result CodesService, Warranty & Technical Support AppendicesInstallation Introduction Safety WarningsInstallation Process Page MultiModemZDX Connections Front Panel LED IndicatorsInstallation Is Your MultiModemZDX Ready for Use? Simple Operations Operating Your MultiModemZDXRemote Configuration AT&Fcr Software ConfigurationHardware/Software Confirmation MultiModemZDX Configuration ConfirmationNone of the LEDs Light When the Modem Is On TroubleshootingModem Does Not Respond to Commands Installation Modem Dials But Cannot Make Connection Installation Modem Disconnects While Online Modem Cannot Connect When AnsweringLosing Data Slow File TransferGarbage Characters on the Monitor AT Commands, S-Registers Result Codes Command Summary Echo Command Mode Characters DialDial string modifiers Monitor Speaker Mode Monitor Speaker VolumeEcho Online Data Characters On-Hook/Off-Hook ControlEnable/Disable Result Codes Return Online to Data ModeModulation Handshake = n Set Register ValueResult Code Selection Modem ResetLong Space Disconnect Data Carrier Detect DCD ControlCommunications Mode Load Factory Default SettingsData Terminal Ready DTR Control 22bis Guard Tone ControlATDS=n \K n Set Break Control \N n Error Correction Mode Selection\V n Protocol Result Code Data Compression ControlSerial Port Baud Rate Modem Baud RateRegisters S10 Register Unit Seconds Range 255 Default DescriptionS28 S11S30 S35S37 S42S43 S89 S48Terse Verbose Description DelayedLocal Analog Loopback Test Modem Testing Local Analog Loopback Test/V.54 LoopDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Testlocal/manual Digital Loopback Test/V.54 Loop 2 Remote/AutoDigital Loopback Test remote/automatic Limited Warranty On-line Warranty Registration Tech SupportRecording Modem Information Service Logging on to the Multi-Tech BBS About the Multi-Tech BBS No Longer AvailableDownloading a File If you know the file nameReading a Message Leaving a MessageIf you don’t know the file name Multi-Tech Fax-Back Service No Longer Available About CompuServe/Internet No Longer AvailableBulletins Appendix a Technical Specifications Command Buffer Intelligent FeaturesData Modulation Fax Modulation22bis/V.22 2400 & 1200 bpsCarrier Frequencies Fax 21 CH2 Half DuplexDiagnostics ConnectorsIndicators Temperature Power RequirementAppendix B Tone Dial Frequencies 697 770 852 941Appendices MT3334ZDX, MT3334ZDXV Appendices Canadian Limitations Notice European Low Voltage Directive Compliance with Babt RequirementsPage Compliance with BS6328 Part Compliance with BS6789 .1 and PartModem Commands Default Permissible Range Modem CE Mark EMC and Safety ComplianceRegister Default Permissible Range Australian and New Zealand Modem Warning NoticeCall Attempts/Retries New Zealand Telecom Warning NoticeIndex Error Correction Page MT5634ZDXv Connections Power Supply Index