Multi-Tech Systems MT5600BL, MT5600BA manual Local Digital Loopback Test V.54 Loop

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C Loopback Tests

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

4.Type the escape sequence +++AT and press ENTERto 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 modem. 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.

Note: You can also start and stop a remote digital loopback test by using the front panel LCD and buttons. See “Diagnostic Options Trunk” in Chapter 3.

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

UUUUUUUUUUU UUU

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 dis- able error correction.

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Contents Model MT5600BA Model MT5600BL Record of Revisions FCC Part Introduction Using the Front PanelQuick Start MultiModemII User GuideRemote Configuration AT Commands, S-Registers & Result CodesSolving Problems Callback SecurityAppendix a Regulatory Compliance Appendix D Warranty, Service, and Technical SupportAppendix C Loopback Tests Appendix E Upgrading the ModemContents Viii Introduction Product Description FeaturesIntroduction Data IntroductionRelated Manuals What Is in Your Modem Package?Quick Start What You Will Need Safety WarningsWe supply You supplyRS232 Connection Connect the Modem to Your SystemDialup Connection Quick StartFour-Wire Leased Line Connection Two-Wire Leased Line ConnectionPower Connection Power-On TestRemoving Your Old Modem from Windows Install the Modem in WindowsAdding the Modem to Windows Install and Configure Your Software Trio DataComm Call the Multi-Tech BBSWindows HyperTerminal Windows Terminal Microsoft Fax Send a FaxTrio Fax References Select Start Programs Accessories Fax Compose new faxMultiModemII User Guide Using the Front Panel LED Indicators Modem ConfigurationLiquid Crystal Display LCD Using the Front PanelOption Selection Menu StructureMultiModemII User Guide Menu Overview Using the Front Panel Status Trunk MultiModemII User Guide Basic Options Trunk Using the Front Panel Advanced Options Trunk Diagnostic Options Trunk MultiModemII User Guide Remote Configuration Options TrunkCaller ID Options Trunk Using the Front Panel Phone Number Memory Options TrunkStatus Menu OptionsUsing the Front Panel Basic Options Implemented Advanced OptionsRemote Configuration Options Caller ID Options MultiModemII User Guide Diagnostic OptionsPhone Number Memory Options AT Commands Registers Result Codes Introduction AT Commands, S-Registers, and Result Codes AT CommandsDS= y Dial Stored Telephone Number Echo Command Mode CharactersHook Control Information RequestMonitor Speaker Mode Monitor Speaker VolumeReturn Online to Data Mode Result Codes Enable/DisableSet Register Value Select RegisterRead Register Value Tone DialingResult Code Selection Modem ResetLong Space Disconnect Data Carrier Detect DCD ControlLoad Factory Settings Error Correction ModesData Terminal Ready DTR Control Modem-Initiated Flow ControlFlow Control Selection Communications Mode22bis Guard Tone Control Test Commands Sync/Async ModeClear to Send CTS Control Data Set Ready DSR ControlStore Current Configuration Display Current ConfigurationDisplay Last Connection Statistics Synchronous Clock SourceLine Signal Level Select Profile for Hard ResetZy =x Store Telephone Number Data Compression ControlPCM Code Selection Line Signal Quality\An Maximum MNP Block Size \Bn Transmit Break\Vn Single Line Connect Message \Nn Error Correction Mode SelectionReserved,maxTXrateCR +MS= Modulation SelectionMNP Extended Services Command #CBNy=x Store Callback Number Command -SDR=nDistinctive Ring ControlCommand #CBPy=x Store Callback Password Flash Memory DownloadCallback Enable/Disable Command #CID= n Caller IDCommand $SBn Serial Port Baud Rate Escape SequenceRegisters Register Unit Range Default DescriptionS32 S36 S46 Terse Verbose Description Result CodesProtocol ALT +FCERROR MultiModemII User Guide Remote Configuration Changing the Remote Configuration Password Basic ProcedureSetup Changing the Remote Escape Character Remote ConfigurationMultiModemII User Guide Callback Security Turning Callback Security On and Off Setup ProceduresCallback Security Assigning Callback PasswordsAssigning Callback Phone Numbers Command #CBN y= x Store Callback Number Calling ProcedureCallback Security Commands Command #CBPy=x Store Callback Password Callback Assignments MultiModemII User Guide Leased Line Operation Two-Wire Setup Leased Line Operation Four-Wire SetupDial Backup and Leased Line Restoral Setup Dial Backup and Leased Line RestoralLeased Line Operation MultiModemII User Guide Solving Problems None of the Indicators Light Solving Problems Modem Does Not Respond to CommandsModem Dials But Cannot Connect Modem4Disconnects While Online File Transfer4Is Slower Than It Should Be Modem4Cannot Connect When AnsweringModem4Doesn’t Work with Caller ID Data Is Being LostThere Are Garbage4 Characters on the Monitor Fax and Data4Software Can’t Run at the Same Time 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, Safety, and Terminal Directive ComplianceAppendix B Technical Specifications Technical Specifications Receiver Sensitivity Loopback Tests Test procedureLocal Analog Loopback Test V.54 Loop Figure 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 LoopBack-to-Back Test Figure C-5. Back-to-back test connections Service Limited WarrantyWarranty, Service, and Technical Support Online Warranty RegistrationTechnical Support Multi-Tech BBSAbout the Internet SupplyNet Online Ordering Instructions Ordering Modem AccessoriesIdentify the Modem Firmware Upgrade OverviewMulti-Tech Web Site Identify the Current Firmware VersionMulti-Tech BBS Upgrading the ModemSet the Modem to the Factory Defaults Download the Upgrade FileExtract the Upgrade Files Restore Your Parameters Upgrade the Modem’s FirmwareRS-232 Pinouts Appendix F Cable PinoutsCable Pinouts Leased Line PinoutsCtrl Code Hex Dec Appendix G Ascii Character MapIndex 108 Index 110

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