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

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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Multitech MT5634ZBA-USB manual Local Analog Loopback Test V.54 Loop, Figure C-1. Local analog loopback test Test Procedure

Contents

User Guide Record of Revisions Trademarks Contents Index Introduction and Description Universal Serial Bus USB IntroductionProduct Description MT5634ZBA-USB User Guide What Is in Your Modem Package? Introduction and Description MT5634ZBA-USB User Guide Quick Start We supply Safety WarningsWhat You Will Need You supply Assemble the Modem Quick Start Install the Software Phone Connection Connect the Modem to Your SystemLine Connection USB Connection Select the Modem Test Your Modem Features Features What Can You Do with Your Modem?Data Computer FaxRequired Equipment Telephone Line Connecting to a Telephone Set Phone Connecting to the Computer USBConnecting to the Telephone Line Line Connections Front Panel Front panel MT5634ZBA-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 Characters Result Codes Enable/Disable Monitor Speaker ModeReturn Online to Data Mode Command Sr=n Set Register Value Command Yn Long Space Disconnect MT5634ZBA-USB User Guide Command Vn Result Code FormatCommand Xn Result Code Selection Modem Reset Communications Mode Load Factory SettingsCommand &Gn V.22bis Guard Tone Control Asynchronous Communications Mode Command &Wn Store Current Configuration MT5634ZBA-USB User Guide Command &Tn V.54 Test CommandsDisplay Current Settings Select Stored Configuration for Hard Reset Data Buffer Control Error Correction Mode SelectionModem Port Flow Control Break Control Command %DCnAT Command Control Inactivity TimerCommand %Cn Data Compression Control Protocol Result Code Command #S=x Store Setup Password Command %En Fallback and Fall Forward ControlEnter Setup Password Command%%%ATCRRemote Configuration Escape Sequence Registers S37 S38Rates K56flex Rates S48 S42S43 S89 Result Codes Terse Verbose Description MT5634ZBA-USB User Guide Remote Configuration Basic Procedure SetupChanging the Setup Password Remote Configuration Changing the Remote Escape Character MT5634ZBA-USB User Guide Troubleshooting None of the Indicators Light Modem Does Not Respond to Commands Troubleshooting Modem Dials But Cannot Connect Modem Doesn’t Work with Caller ID Modem Cannot Connect When AnsweringModem Disconnects While Online Fax and Data Software Can’t Run at the Same Time Appendixes Appendix a Regulatory Compliance FCC Regulations for Telephone Line Interconnection Class B Statement Industry Canada Canadian Limitations Notice FAX Branding Statement European Directives International Modem RestrictionsNew Zealand Telecom Warning Notice Appendix B Technical Specifications ITU-T ConnectorsCarrier Frequencies ITU-T V.32bis/V.32 Carrier Frequencies Dimensions DiagnosticsIndicators Weight Appendix C Loopback Tests Introduction Figure C-1. Local analog loopback test Test Procedure Local Analog Loopback Test V.54 Loop Remote Digital Loopback Test V.54 Loop Appendix C Loopback Tests Figure C-3. Local digital loopback test Test Procedure Local Digital Loopback Test V.54 Loop Online Warranty Registration Appendix D Warranty, Service, and Technical SupportLimited Warranty Service To Log on to the Multi-Tech BBS Technical SupportMulti-Tech BBS To Download a File About the Multi-Tech Fax-Back Service About the Internet Index Index MT5634ZBA-USB User Guide