Testing and Troubleshooting | Multi-Tech Systems MT2834MR6 instruction

Chapter 6 - Testing and Troubleshooting

6.1Introduction

Each time you power up the MT2834MR6, it performs an automatic self-test to ensure proper operation. The MT2834MR6 also has three diagnostic tests: local analog loopback, digital loopback (remote/automatic), and digital loopback (local/manual). These ITU-T V.54 loopback tests isolate telephone circuit and transmission problems.

In a loopback test, data from your computer loops through the circuits of your modem and/or a remote modem before it appears on your monitor. When the loop has been completed, the data on your PC’s monitor should match the original data.

The local analog loopback test allows you to verify that the modem’s transmitter and receiver circuits are functioning properly.

The local digital loopback allows you to verify that the local computer or terminal, the two modems, and the transmission line between them are functioning properly.

The remote digital loopback test allows you to verify that the remote computer or terminal, the remote modem, the serial ports, the telephone line, and the local modem are functioning properly.

Note: Loopback tests operate at all speeds except 300 bps.

Other tests are initiated with the MultiModemManager software, as explained in the MultiModemManager Owner's Manual.

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Multi-Tech Systems MT2834MR6 manual Testing and Troubleshooting

Contents

User Guide Trademarks Revision Date Description Contents Registers Warranty & Service Index 116 Introduction Manual Organization Introduction Description FCC Regulations for Telephone Line Interconnection FCC Fax Update Canadian Limitations Notice Technical Specifications Bell 103/113 Diagnostics300 bps Fax Carrier Power Supply Busy Switch Modem LED IndicatorsSpeed Data Rate bps LED State Safety Warnings 10 MT2834MR6 Installation Notes Dialing and Answering Dial-Up Handshaking Details Dial-Up Automatic Answering Call Termination AT Commands Modes of Operation Working with AT Commands Command Editing Command Structure AT Commands Flow control disabled Baud adjustModem baud rate Serial port baud rate Alternate out-of-band escape sequence Force answer modeEscape sequence selection Go back online Default none Dialing CommandsDial = phone number Default P Dial Modifier CommandsDefault R0 Pulse or Tone Dialing Or 4 through 255 seconds International models ATDT1028806127853500 $123456789 NdNe Number Linking = 0 or = 1 or Default none Phone Number Memory Commands P9,T14089876543 T14082345678 Default &W1 Configuration Storage and Recall CommandsDefault &F8 = 0, 8, or ATZ AT&W1 defaultAT&F8&W0 AT&F9&W0 Modem Response Result Code Commands Default Default &A0Result Codes and Call Progress Selection #An Auto Speed Detection Default #A0 Online Connection CommandsDefault B0 DCn AT Command Control = 0 or Default %DC0 CDn Cleardown at Disconnect = 0 or Default &CD0 DTn Dtmf Detection = 0 or Default DT0#Fn Fallback Modes = 0, 1, or Default #F2 Default *H0 Default &G0 models outside U.KDefault &P0 Models outside U.K G2 U.K. models only #T1 enables TCM #T0 disables TCMDefault Y0 Issued V.34 Commands Default &C1 RS-232 Interface CommandsDefault &D2 Default &R1 Go high again Default &S1S0 forces DSR high S1 allows DSR to act normally, that is, to follow CD Default &E1 Error Correction and Data Compression CommandsDefault &E15 #Ln Error Correction Modes Default #L0 $En Error Correction at 300 bps = 0 or Default $E0 $An Autoreliable Buffering = 0 or Default $A0$Rn Retransmit Count = 0 or Default $R0 Speed Conversion Commands $SB300 $SBn Serial Port Baud Rate = speed Default $SB57600$SB1200 $SB2400 Immediate Action Commands Rate Renegotiation BSn Maximum Reliable Block Size = 0 or Default &BS1 Flow Control Commands$EBn Asynchronous Word Length = 0 or Default $EB0 Flow Control Disable Default &E8 Default &E6Non-Error Correction Mode Flow Control Default &E10 #Xn Number of Xoff Characters Sent = 0 or Default #X0 Default &E13Pacing Computer-Initiated Flow Control = 12 or Escape Sequences Atcr Remote Configuration Escape Sequence Remote Configuration Commands Line Probe Commands Diagnostic Commands Registers Registers Default 10 J Default 13 MDefault 8 H Return Character Default 45 North America and International Time for Carrier Abort TimerUnit 1 second Range 1-255 U.S.A Maximum S11 value is 255 ms 255 units Registers Registers Reading and Assigning S-Register Values Examples of Assigning ValuesExamples of Reading Values AT Commands Affecting S-Registers Error Correction, Data Compression & Speed Conversion Error Correction, Data Compression, and Speed Conversion How V.42 Detects and Corrects Errors MNP Classes Data Compression 1 #L0 Command V.42 Mode Select Command #L2 #L1 Command 3 #L2 Command Reliable Mode &E2 Non-Error Correction Mode &E0Autoreliable Mode &E1 Modes of Operation Flow control and pacing Flow Control Modem-Initiated Flow Control 1 XON/XOFF Flow Control &E5Hardware Flow Control &E4 Pacing &E13 Non-Error Correction Mode Flow Control &E10 and &E111 XON/XOFF Pass-Through &E7 Hewlett Packard ENQ/ACK Pacing &E9 Non-Error Correction Mode Flow Control 10.1 V.42 Error Correction ModesModem-Initiated Flow Control 10.3 XON/XOFF Pass-Through LAP-M Error Correction MNP Error CorrectionResult Codes Speed Conversion Modem Baud Rate $MB Baud Adjust $BA Serial Port Baud Rate $SB Autoreliable Buffering $A Related CommandsMaximum Block Size &BS Autoreliable Fallback Character $F 13.5 V.42 Error Correction at 300 bps $E SummaryRetransmit Count $R Testing & Troubleshooting Testing and Troubleshooting Local Analog Loopback Test V.54 Loop Test Procedure Remote digital loopback test Remote Digital Loopback Test V.54 Loop Local digital loopback test Local Digital Loopback Test V.54 Loop Warranty & Service Multi-Tech Systems, Inc. Warranty & Repairs Policies Warranty2 U.S. and Canadian Customers International Distributors International Customers outside U.S.A. and Canada Repair Procedures for U.S. and Canadian Customers Repair Procedures for International CustomersRepairs Technical Support Internet SiteCountry Telephone Appendices Appendix a Ascii Conversion Chart Dial Pulses Appendix B Figure B-2. Standard Dtmf frequencies Tone Dial Frequencies Result Code Summary Appendix C Standard AT Result Codes &Q1 Register Unit Range Default Description Appendix DRegister Summary S34 AT Command Summary Command Values DescriptionAppendix E CDn 100 101 102 103 104 105 RS-232C Interface Specifications Signal Information Negative PositiveAppendix F Transmitted Data TD Pin 2 To modem Functional Description of the RS-232C Signals Test Voltage +V Pin From modem External Transmit Clock XTC Pin To modem Appendix G Cable and Connector Diagrams Introduction to MultiTech Escape Methods Appendix H Escape Method 1 +++ATCR How to Select an Escape Method Aborting an Escape Sequence Registers and Escape Sequence Introduction to Remote Configuration Basic ProcedureSetup Changing the Remote Escape Character Changing the Passwords Index Index 118 119 120 121 122 S000326A