Multitech MT5634ZBA-USB manual Local Digital Loopback Test V.54 Loop

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MT5634ZBA-USB User Guide

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 itself 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 AnalogAnalog 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.

4.Type AT&T3 and press ENTER. Once you receive an OK message from your modem (if responses are enabled), your modem is placed in digital loopback mode.

5.Have someone enter data from the remote 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 data received by your modem enters its analog receiver, is converted to digital data, is reconverted into analog, and then is transmitted back to the remote modem. Your modem passes this test if the data received on the remote monitor is the same as the data entered from the remote keyboard.

6.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 message. If you wish to stay on line with the remote modem for normal data transmission, 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.

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Contents User Guide Record of Revisions TrademarksContents Index Introduction and Description Introduction Product DescriptionUniversal Serial Bus USB MT5634ZBA-USB User GuideWhat Is in Your Modem Package? Introduction and DescriptionMT5634ZBA-USB User Guide Quick Start Safety Warnings What You Will NeedWe supply You supplyAssemble the Modem Quick StartInstall the Software Connect the Modem to Your System Line ConnectionPhone Connection USB ConnectionSelect the Modem Test Your ModemFeatures Data FeaturesWhat Can You Do with Your Modem? Fax Required EquipmentComputer Telephone LineConnecting to the Computer USB Connecting to the Telephone Line LineConnecting to a Telephone Set Phone ConnectionsFront Panel Front panelMT5634ZBA-USB User Guide AT Commands, S-Registers and Result Codes AT Commands AT Command Summary Command DS=n Dial Stored Telephone Number Echo Command Mode CharactersMonitor Speaker Volume Echo Online Data CharactersMonitor Speaker Mode Return Online to Data ModeResult Codes Enable/Disable Command Sr=n Set Register ValueMT5634ZBA-USB User Guide Command Vn Result Code Format Command Xn Result Code SelectionCommand Yn Long Space Disconnect Modem ResetLoad Factory Settings Command &Gn V.22bis Guard Tone ControlCommunications Mode Asynchronous Communications ModeMT5634ZBA-USB User Guide Command &Tn V.54 Test Commands Display Current SettingsCommand &Wn Store Current Configuration Select Stored Configuration for Hard ResetError Correction Mode Selection Modem Port Flow ControlData Buffer Control Break ControlInactivity Timer Command %Cn Data Compression ControlCommand %DCnAT Command Control Protocol Result CodeCommand %En Fallback and Fall Forward Control Enter Setup PasswordCommand #S=x Store Setup Password Command%%%ATCRRemote Configuration Escape SequenceRegisters Rates K56flex Rates S37S38 S42 S43S48 S89Result Codes Terse Verbose DescriptionMT5634ZBA-USB User Guide Remote Configuration Changing the Setup Password Basic ProcedureSetup Remote Configuration Changing the Remote Escape CharacterMT5634ZBA-USB User Guide Troubleshooting None of the Indicators Light Modem Does Not Respond to CommandsTroubleshooting Modem Dials But Cannot ConnectModem Cannot Connect When Answering Modem Disconnects While OnlineModem Doesn’t Work with Caller ID Fax and Data Software Can’t Run at the Same TimeAppendixes Appendix a Regulatory Compliance FCC Regulations for Telephone Line InterconnectionClass B Statement Industry CanadaCanadian Limitations Notice FAX Branding StatementNew Zealand Telecom Warning Notice European DirectivesInternational Modem Restrictions Appendix B Technical Specifications Connectors Carrier FrequenciesITU-T ITU-T V.32bis/V.32 Carrier FrequenciesDiagnostics IndicatorsDimensions WeightAppendix C Loopback Tests IntroductionFigure C-1. Local analog loopback test Test Procedure Local Analog Loopback Test V.54 LoopRemote Digital Loopback Test V.54 Loop Appendix C Loopback TestsFigure C-3. Local digital loopback test Test Procedure Local Digital Loopback Test V.54 LoopAppendix D Warranty, Service, and Technical Support Limited WarrantyOnline Warranty Registration ServiceTechnical Support Multi-Tech BBSTo Log on to the Multi-Tech BBS To Download a FileAbout the Multi-Tech Fax-Back Service About the InternetIndex Index MT5634ZBA-USB User Guide