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

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MultiModemII User Guide

3.Type AT&T1 and press ENTER. This places your modem in analog loopback mode in the originate mode. A CONNECT message should appear on your dis- play. The modem is now out of command mode and in a pseudo-online mode.

4.Note that the CD and TM indicators are on. If they are not on, there is a defect in your modem.

5.Enter characters from your keyboard. For this test, typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The characters entered should be displayed on your monitor. The TD and RD LEDs should flash when a character is entered.

6.To exit the test, type the escape sequence +++AT and press ENTER. This puts the modem in online command mode. Then type either AT&T or ATH to return to command mode.

7.Your modem passes this test if the data received on your monitor are the same as the data entered from your keyboard. If different data appear on your moni- tor, your modem is probably causing the problem, though it could also be your computer. If your modem passes this test, but you are receiving errors while on line, the remote modem or the phone line could be at fault.

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

Remote Digital Loopback Test (V.54 Loop 2)

The remote digital loopback test tests the phone lines and the circuits of both your modem and a remote modem. In this test, your modem must be on line with another modem that is set up to respond to a request for remote digital loopback. (Note that some modems might not support remote digital loopback or might have it disabled.) Data from your computer or terminal is transmitted through your modem and over the phone line to the remote modem, where it is then looped back to your modem.

AT&T6

OK

UUUUUUUUUUU

UUU

Digital Analog			Analog Digital

AT&T6

OK

Computer or Terminal Local MultiModem

Remote MultiModem Computer or Terminal

Figure C-2. Remote digital loopback test.

Test procedure

1.Arrange to have &T6 set on the remote test modem.

2.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 Using the Front Panel IntroductionQuick Start MultiModemII User GuideAT Commands, S-Registers & Result Codes Remote ConfigurationSolving Problems Callback SecurityAppendix D Warranty, Service, and Technical Support Appendix a Regulatory ComplianceAppendix C Loopback Tests Appendix E Upgrading the ModemContents Viii Introduction Introduction FeaturesProduct Description Introduction DataWhat Is in Your Modem Package? Related ManualsQuick Start Safety Warnings What You Will NeedWe supply You supplyConnect the Modem to Your System RS232 ConnectionDialup Connection Quick StartTwo-Wire Leased Line Connection Four-Wire Leased Line ConnectionPower Connection Power-On TestAdding the Modem to Windows Install the Modem in WindowsRemoving Your Old Modem from Windows Install and Configure Your Software Call the Multi-Tech BBS Trio DataCommWindows HyperTerminal Windows Terminal Trio Fax Send a FaxMicrosoft Fax Select Start Programs Accessories Fax Compose new fax ReferencesMultiModemII User Guide Using the Front Panel Modem Configuration LED IndicatorsUsing the Front Panel Liquid Crystal Display LCDOption 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 MultiModemII User Guide Remote Configuration Options Trunk Diagnostic Options TrunkUsing the Front Panel Phone Number Memory Options Trunk Caller ID Options TrunkMenu Options StatusUsing the Front Panel Basic Options Advanced Options ImplementedRemote Configuration Options Phone Number Memory Options MultiModemII User Guide Diagnostic OptionsCaller ID Options AT Commands Registers Result Codes Introduction AT Commands AT Commands, S-Registers, and Result CodesEcho Command Mode Characters DS= y Dial Stored Telephone NumberHook Control Information RequestMonitor Speaker Volume Monitor Speaker ModeReturn Online to Data Mode Result Codes Enable/DisableSelect Register Set Register ValueRead Register Value Tone DialingModem Reset Result Code SelectionLong Space Disconnect Data Carrier Detect DCD ControlError Correction Modes Load Factory SettingsData Terminal Ready DTR Control Modem-Initiated Flow Control22bis Guard Tone Control Communications ModeFlow Control Selection Sync/Async Mode Test CommandsClear to Send CTS Control Data Set Ready DSR ControlDisplay Current Configuration Store Current ConfigurationDisplay Last Connection Statistics Synchronous Clock SourceSelect Profile for Hard Reset Line Signal LevelZy =x Store Telephone Number Data Compression ControlLine Signal Quality PCM Code Selection\An Maximum MNP Block Size \Bn Transmit Break\Nn Error Correction Mode Selection \Vn Single Line Connect Message+MS= Modulation Selection Reserved,maxTXrateCRMNP Extended Services Command -SDR=nDistinctive Ring Control Command #CBNy=x Store Callback NumberCommand #CBPy=x Store Callback Password Flash Memory DownloadCommand #CID= n Caller ID Callback Enable/DisableCommand $SBn Serial Port Baud Rate Escape SequenceRegister Unit Range Default Description RegistersS32 S36 S46 Result Codes Terse Verbose DescriptionProtocol ALT +FCERROR MultiModemII User Guide Remote Configuration Setup Basic ProcedureChanging the Remote Configuration Password Remote Configuration Changing the Remote Escape CharacterMultiModemII User Guide Callback Security Setup Procedures Turning Callback Security On and OffAssigning Callback Passwords Callback SecurityAssigning Callback Phone Numbers Callback Security Commands Calling ProcedureCommand #CBN y= x Store Callback Number Command #CBPy=x Store Callback Password Callback Assignments MultiModemII User Guide Leased Line Operation Two-Wire Setup Four-Wire Setup Leased Line OperationDial Backup and Leased Line Restoral Dial Backup and Leased Line Restoral SetupLeased Line Operation MultiModemII User Guide Solving Problems None of the Indicators Light Modem Does Not Respond to Commands Solving ProblemsModem Dials But Cannot Connect Modem4Disconnects While Online Modem4Cannot Connect When Answering File Transfer4Is Slower Than It Should BeThere Are Garbage4 Characters on the Monitor Data Is Being LostModem4Doesn’t Work with Caller ID Fax and Data4Software Can’t Run at the Same Time Appendixes Appendix a Regulatory Compliance FCC Part 68 TelecomFax Branding Statement Regulatory ComplianceInternational Modem Restrictions Canadian Limitations NoticeCommission Decision CTR21 EMC, Safety, and Terminal Directive Compliance New Zealand Telecom Warning NoticeAppendix B Technical Specifications Technical Specifications Receiver Sensitivity Local Analog Loopback Test V.54 Loop Test procedureLoopback Tests Remote Digital Loopback Test V.54 Loop Figure C-2. Remote digital loopback testLocal Digital Loopback Test V.54 Loop Figure C-3. Local digital loopback testBack-to-Back Test Figure C-5. Back-to-back test connections Limited Warranty ServiceOnline Warranty Registration Warranty, Service, and Technical SupportTechnical Support Multi-Tech BBSAbout the Internet Ordering Modem Accessories SupplyNet Online Ordering InstructionsUpgrade Overview Identify the Modem FirmwareIdentify the Current Firmware Version Multi-Tech Web SiteMulti-Tech BBS Upgrading the ModemExtract the Upgrade Files Download the Upgrade FileSet the Modem to the Factory Defaults Upgrade the Modem’s Firmware Restore Your ParametersAppendix F Cable Pinouts RS-232 PinoutsLeased Line Pinouts Cable PinoutsAppendix G Ascii Character Map Ctrl Code Hex DecIndex 108 Index 110

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