Multitech MT5634ZBA-USB manual Appendix C Loopback Tests, Introduction

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Appendix B - Technical Specifications

Appendix C: Loopback Tests

Introduction

Each time you turn on your modem, it performs an automatic self-test to ensure proper operation. Your modem also has three diagnostic tests: local analog loopback, remote digital loopback, and local digital loopback. These ITU-T V.54 loopback tests isolate telephone circuit and transmission problems.

In a loopback test, data from your computer loops through the circuits of your modem and/or a remote modem before it appears on your monitor. When the loop has been completed, the data on your computer’s monitor should match the original data.

The local analog loopback test allows you to verify that the modem’s transmitter and receiver circuits are functioning properly.

The local digital loopback allows you to verify that the local computer or terminal, the two modems, and the transmission line between them are functioning properly.

The remote digital loopback test allows you to verify that the remote computer or terminal, the remote modem, the serial ports, the telephone line, and the local modem are functioning properly.

Note: All loopback tests operate at all speeds except 300 bps.

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Contents User Guide Trademarks Record of RevisionsContents Index Introduction and Description Product Description IntroductionUniversal Serial Bus USB MT5634ZBA-USB User GuideIntroduction and Description What Is in Your Modem Package?MT5634ZBA-USB User Guide Quick Start What You Will Need Safety WarningsWe supply You supplyQuick Start Assemble the ModemInstall the Software Line Connection Connect the Modem to Your SystemPhone Connection USB ConnectionTest Your Modem Select the ModemFeatures Data FeaturesWhat Can You Do with Your Modem? Required Equipment FaxComputer Telephone LineConnecting to the Telephone Line Line Connecting to the Computer USBConnecting to a Telephone Set Phone ConnectionsFront panel Front PanelMT5634ZBA-USB User Guide AT Commands, S-Registers and Result Codes AT Commands AT Command Summary Echo Command Mode Characters Command DS=n Dial Stored Telephone NumberMonitor Speaker Volume Echo Online Data CharactersReturn Online to Data Mode Monitor Speaker ModeResult Codes Enable/Disable Command Sr=n Set Register ValueCommand Xn Result Code Selection MT5634ZBA-USB User Guide Command Vn Result Code FormatCommand Yn Long Space Disconnect Modem ResetCommand &Gn V.22bis Guard Tone Control Load Factory SettingsCommunications Mode Asynchronous Communications ModeDisplay Current Settings MT5634ZBA-USB User Guide Command &Tn V.54 Test CommandsCommand &Wn Store Current Configuration Select Stored Configuration for Hard ResetModem Port Flow Control Error Correction Mode SelectionData Buffer Control Break ControlCommand %Cn Data Compression Control Inactivity TimerCommand %DCnAT Command Control Protocol Result CodeEnter Setup Password Command %En Fallback and Fall Forward ControlCommand #S=x Store Setup Password Command%%%ATCRRemote Configuration Escape SequenceRegisters Rates K56flex Rates S37S38 S43 S42S48 S89Terse Verbose Description Result CodesMT5634ZBA-USB User Guide Remote Configuration Changing the Setup Password Basic ProcedureSetup Changing the Remote Escape Character Remote ConfigurationMT5634ZBA-USB User Guide Troubleshooting Modem Does Not Respond to Commands None of the Indicators LightModem Dials But Cannot Connect TroubleshootingModem Disconnects While Online Modem Cannot Connect When AnsweringModem Doesn’t Work with Caller ID Fax and Data Software Can’t Run at the Same TimeAppendixes FCC Regulations for Telephone Line Interconnection Appendix a Regulatory ComplianceIndustry Canada Class B StatementFAX Branding Statement Canadian Limitations NoticeNew Zealand Telecom Warning Notice European DirectivesInternational Modem Restrictions Appendix B Technical Specifications Carrier Frequencies ConnectorsITU-T ITU-T V.32bis/V.32 Carrier FrequenciesIndicators DiagnosticsDimensions WeightIntroduction Appendix C Loopback TestsLocal Analog Loopback Test V.54 Loop Figure C-1. Local analog loopback test Test ProcedureAppendix C Loopback Tests Remote Digital Loopback Test V.54 LoopLocal Digital Loopback Test V.54 Loop Figure C-3. Local digital loopback test Test ProcedureLimited Warranty Appendix D Warranty, Service, and Technical SupportOnline Warranty Registration ServiceMulti-Tech BBS Technical SupportTo Log on to the Multi-Tech BBS To Download a FileAbout the Internet About the Multi-Tech Fax-Back ServiceIndex Index MT5634ZBA-USB User Guide