Multi-Tech Systems MT5634MSV manual Local Digital Loopback Test V.54 Loop

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C Loopback Tests

4.Type the escape sequence +++AT and press ENTER to bring your modem into online command mode.

5.Type AT&T6 and press ENTER. The local modem responds to this command by transmitting an unscrambled marking signal, which causes the remote modem to place itself in digital loopback mode. Then the local modem exits online com- mand mode and enters data mode.

6.Enter data from your keyboard. For this test, typing multiple uppercase U char- acters is a good way to send an alternating test pattern of binary ones and zeroes. Data received by the remote modem enters its analog receiver, is converted to digital data, is reconverted into analog, and then is transmitted back to your mo- dem. Your modem passes this test if the data received on your monitor is the same as the data entered from your keyboard.

7.To exit the test, type the escape sequence +++AT and press ENTER. This puts the modem in online command mode. The modem should respond with an OK mes- sage. If you wish to stay on line with the remote modem for normal data trans- mission, type AT&T and press ENTER to exit the test, then type ATO and press ENTER to return on line. If you wish to terminate the call, type ATH and press ENTER to hang up.

Local Digital Loopback Test (V.54 Loop 2)

The local digital loopback test is identical to the remote digital loopback test with one exception. Instead of using your modem to signal a remote modem to place it- self in digital loopback mode, your modem is placed in digital loopback mode while the remote modem is not. Data is entered and transmitted from the remote modem, sent across the phone line to your modem, and looped back to the remote modem.

AT&T3

OK

UUUUUUUUU UUUUU

	Digital Analog				Analog Digital

Computer or Terminal Local MultiModem

Remote MultiModem Computer or Terminal

Figure C-3. Local digital loopback test

Test procedure

1.Open your communications software and go into terminal mode. Type AT and press ENTER; you should get an OK message. Type AT\N and press ENTER to disable error correction.

2.Dial the remote modem and establish your online connection.

3.Type the escape sequence +++AT and press ENTER to bring your modem into online command mode.

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Contents User Guide FCC Part User Guide Record of Revisions MessageSaver Operation IntroductionQuick Start Remote Configuration AT Commands, S-Registers & Result CodesSolving Problems PhoneToolsAppendix C Loopback Tests Appendix a Regulatory ComplianceAppendix E Upgrade Procedures Appendix D Warranty, Service, and Technical SupportIntroduction Introduction Product Description How to Get a Copy of Your User Guide Related Manuals What Is in Your Modem Package?MessageSaver User Guide Quick Start Introduction Safety WarningsWhat You Will Need We supplyOpening the Modem Mount the FeetSelect Stereo or Mono Speaker Location of speaker jumper Changing the Speaker JumperLine Connection Connect the Modem to Your SystemRS232 Connection Power-On Test Power ConnectionPhone Connection Microphone ConnectionRemoving Your Old Modem from Windows Install the Modem in WindowsAdding the Modem to Windows Install and Configure Your Software Call the Multi-Tech BBS Windows HyperTerminal Windows Terminal Microsoft Fax Send a FaxReferences Select Start Programs Accessories Fax Compose new faxMessageSaver User Guide MessageSaver Operation Independent Mode Functions PhoneTools FeaturesMessageSaver Operation Recording and Downloading an AnnouncementIndependent Mode Configuration Dialog Box Independent Mode Operation in PhoneToolsIndependent Mode Control dialog box Independent Mode Control Dialog BoxControl Buttons Independent Mode Operation Using the Front PanelIndicator Lights Answering a Call with the Speakerphone Adjusting Speaker VolumePlaying Voice Messages Stopping the Play of Voice MessagesControlling the MessageSaver Remotely Remote ControlUsing the MessageSaver in Speakerphone Mode Remote Control Keys Activating Independent Mode RemotelyAT Commands Registers Result Codes AT Commands AT Command Summary DS=y Dial Stored Telephone Number Echo Command Mode CharactersEcho Online Data Characters Hook ControlMonitor Speaker Mode Monitor Speaker VolumeReturn Online to Data Mode Modulation HandshakeSet Register Value Result Codes Enable/DisableSr? Read Register Value Tone DialingLong Space Disconnect Modem ResetAuto Retrain Data Carrier Detect DCD ControlCommunications Mode Load Factory SettingsAsynchronous Communications Mode 22bis Guard Tone ControlDisplay Current Settings Test CommandsStore Current Configuration Select Stored Configuration for Hard Reset\Bn Transmit Break \An\Gn Modem Port Flow Control \Jn Data Buffer Control\Qn Flow Control Selection \Nn Error Correction Mode Selection\Tn Inactivity Timer \Vn Protocol Result Code DCn AT Command Control\Xn XON/XOFF Pass-Through Data Calling Tone#Sx Enter Setup Password Command +ES=n Enable Synchronous Buffered Mode#S=x Store Setup Password Command +++ATCR Escape SequenceRegisters Register Unit Range Default DescriptionRegister Unit Range Default Description S37 Register Unit Range Default Description S42 Terse Verbose Description Result CodesBlacklist Full Remote Configuration Changing the Setup Password Basic ProcedureSetup Changing the Remote Escape Character MessageSaver User Guide Solving Problems None of the Indicators Light Modem Does Not Respond to Commands Modem Dials But Cannot Connect Modem4Disconnects While Online Data Is Being Lost Modem4Cannot Connect When AnsweringFile Transfer4Is Slower Than It Should Be Fax and Data4Software Can’t Run at the Same Time There Are Garbage4 Characters on the MonitorModem4Doesn’t Work with Caller ID MessageSaver User Guide PhoneTools Installing PhoneTools Making a Phone Call Using PhoneTools’ Status BarPhone Module Making Quick Dial Entries Using the SpeakerphoneActivating and Deactivating Answerphone Setting up AnswerphoneVoice Module Setting Up the Answer/Record Mode Setting Up the Answer Only ModeListening to Received Messages in PhoneTools Listening to Received Messages from a Remote PhoneChanging Recording Parameters Recording an AnnouncementHow Does It Work? Independent ModeConfiguring and Controlling Independent Mode Operation Selecting an Announcement Activating and Configuring Independent ModeManaging Stored Documents Inbox Independent ModeFaxing a Document from a Windows Application Fax ModuleSending a Cover Faxing a File Directly from PhoneToolsViewing and Printing Faxes Adding a Logo to the CoverInbox Management Inbox and Outbox ManagementOutbox Management Creating New Records Phone BookImporting Existing Records Selecting RecordsUsing the Phone Book for Dialing Starting a Modem Connection Terminal Emulation ModuleCapturing Information to Disk Uploading Files to a Remote SystemSending a Data File Automatically Data File TransferReceiving a Data File Automatically 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 and Safety ComplianceMessageSaver User Guide Appendix B Technical Specifications Carrier Frequencies Frequency Stability MessageSaver User Guide Local Analog Loopback Test V.54 Loop Test procedureFigure 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 LoopMessageSaver User Guide Service Limited WarrantyMulti-Tech BBS Online Warranty RegistrationTechnical Support About the Internet SupplyNet Online Ordering Instructions Modem AccessoriesAbout the Multi-Tech Fax-Back Service Identify the Modem Firmware Upgrade OverviewMulti-Tech BBS Identify the Current Firmware VersionMulti-Tech Web Site Clear Your Stored Paramenters Download the Upgrade FileExtract the Upgrade Files Restore Your Parameters Upgrade the Modem’s FirmwareIndex Symbols Index 106