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

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MT5634ZBA-USB User Guide

Local Analog Loopback Test (V.54 Loop 3)

In this test, data from your computer or terminal is sent to your modem’s transmitter, converted into analog form, looped back to the modem’s receiver, converted into digital form, and then sent to your monitor for verification. No connection to the phone line is required.

AT&T1

CONNECT

UUUUUUUUU

UUU

Digital Analog

Computer or Terminal

Local MultiModem

Figure C-1. Local analog loopback test.

Test Procedure

1.Connect the modem to your computer. Using your communication program, set the desired baud rate and go into terminal mode.

2.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 display. The modem is now out of command mode and in a pseudo-online mode.

3.Note that the CD LED is on. If you are set for 14,400 bps or higher, a speed LED should be on. If the CD LED is not on, there is a defect in your modem.

4.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.

5.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.

6.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 monitor, 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.

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Contents User Guide Record of Revisions TrademarksContents Index Introduction and Description Universal Serial Bus USB IntroductionProduct Description MT5634ZBA-USB User GuideWhat Is in Your Modem Package? Introduction and DescriptionMT5634ZBA-USB User Guide Quick Start We supply Safety WarningsWhat You Will Need You supplyAssemble the Modem Quick StartInstall the Software Phone Connection Connect the Modem to Your SystemLine Connection USB ConnectionSelect the Modem Test Your ModemFeatures Features What Can You Do with Your Modem?Data Computer FaxRequired Equipment Telephone LineConnecting to a Telephone Set Phone Connecting to the Computer USBConnecting to the Telephone Line Line ConnectionsFront Panel Front panelMT5634ZBA-USB User Guide AT Commands, S-Registers and Result Codes AT Commands AT Command Summary Monitor Speaker Volume Command DS=n Dial Stored Telephone NumberEcho Command Mode Characters Echo Online Data CharactersResult Codes Enable/Disable Monitor Speaker ModeReturn Online to Data Mode Command Sr=n Set Register ValueCommand Yn Long Space Disconnect MT5634ZBA-USB User Guide Command Vn Result Code FormatCommand Xn Result Code Selection Modem ResetCommunications Mode Load Factory SettingsCommand &Gn V.22bis Guard Tone Control Asynchronous Communications ModeCommand &Wn Store Current Configuration MT5634ZBA-USB User Guide Command &Tn V.54 Test CommandsDisplay Current Settings Select Stored Configuration for Hard ResetData Buffer Control Error Correction Mode SelectionModem Port Flow Control Break ControlCommand %DCnAT Command Control Inactivity TimerCommand %Cn Data Compression Control Protocol Result CodeCommand #S=x Store Setup Password Command %En Fallback and Fall Forward ControlEnter Setup Password Command%%%ATCRRemote Configuration Escape SequenceRegisters S37 S38Rates K56flex Rates S48 S42S43 S89Result Codes Terse Verbose DescriptionMT5634ZBA-USB User Guide Remote Configuration Basic Procedure SetupChanging the Setup Password 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 Doesn’t Work with Caller ID Modem Cannot Connect When AnsweringModem Disconnects While Online 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 StatementEuropean Directives International Modem RestrictionsNew Zealand Telecom Warning Notice Appendix B Technical Specifications ITU-T ConnectorsCarrier Frequencies ITU-T V.32bis/V.32 Carrier FrequenciesDimensions DiagnosticsIndicators 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 LoopOnline Warranty Registration Appendix D Warranty, Service, and Technical SupportLimited Warranty ServiceTo Log on to the Multi-Tech BBS Technical SupportMulti-Tech BBS To Download a FileAbout the Multi-Tech Fax-Back Service About the InternetIndex Index MT5634ZBA-USB User Guide