Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual Problem Solving

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2.0 Quick Start

2.5 Problem Solving

If you encounter difficulties in setting up or using the modem, try the remedies described below. If you suspect a system malfunction, follow the diagnostic procedures described in Chapter 7. If you cannot resolve the problem, call your supplier.

1.ALL MODES

Make sure all cables are properly connected to the back of the modem.

2. ALL DIAL MODES (HAYES, V.25 BIS, DUMB, BELL 208, AND V.32/208)

DTR (Data Terminal Ready) must be ON if you want to use the modem’s autodial or auto-answer features. (If DTR is ON, the TR indicator is present on the EIA status screen.)

3.ALL ASYNCHRONOUS MODES

The modem’s default DTE speed is 38.4 Kbps in asynchronous mode. If the local DTE does not support this speed, change the modem’s DTE Speed option setting. In Hayes mode, the default DTE speed is automatically overridden when the Modem is autobauded (the Hayes mode AT attention code is sent to the Modem).

4.HAYES MODE

In Hayes mode with default settings in effect, the Modem transmits result codes (messages) to the DTE. In some instances, this may cause undesirable interaction with the attached DTE. If such interaction occurs, use the AT Q2 command to suppress result codes for incoming calls.

5.ALL LEASED-LINE MODES (2-WIRE,4-WIRE,AND V.33)

DTR (Data Terminal Ready) must be ON for the units to train on the leased line. (If DTR is ON, the TR indicator is present on the EIA status screen.)

Four types of compromise equalization are available to compensate for distortion. If the signal quality appears to be inadequate (see Quality Screen in Section 7.6.2), or if the modems are frequently retraining, try changing the equalization option. See Compromise Equalizers in Section 3.3.6.

6.LEASED-LINE (EXCLUDING V.33 OPERATION)

Make sure one modem is set to originate mode and that the other is set to answer mode. (If the correct Quick Setup is selected, and not incorrectly modified, the answer/originate status should be correct.)

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Contents Modem FCC Information Table of Contents Table of Contents Diagnostics Table of Conents Specifications Specifications Installation Quick StartQuick Start For all applicationsFor dialup applications For leased-line applicationsFront-Panel LCD and Controls Front-Panel LCD and ControlsRS = TR =MR = CS =Quick Setup V25 Dial Async Available Quick Setup ConfigurationsDial Hayes V25 Dial SyncQuick Setup 07 2-W Leased ANS Quick Setup 11 2-W Dial Quick Setup 12 2-W Dial V32/208AT D 9,5551212 cr Basic OperationAT D 5551212 cr AT DP Synchronous V.25 bis Operation Asynchronous V.25 bis OperationCRN Pushbutton 1 Phone Pushbutton 2 Prog Auto-Dial Failure Messages ENT9600 6 2-WIREDIAL Bell 208 Operation Quick Setups 11 34/V.32 Dial Backup Slave-to-Master Inbound Transmission Problem Solving This page is intentionally left blank Modem Setup Options Methods For Selecting OptionsSelecting Options from the Front-Panel Setup Type Line Speed For Modem SETUPS. The first Options Modem SETTING, bps Resultant Data RATE, bpsModem 1 V.42 Error Correction Options Modem Modem Setup Options Modem Modem Setup Options Dialer Mode Data Format Options Modem See Section Remote Test Enable Disable Modem Setup Options Modem Setups Compromise Equalizers option is available for all modes Modem 8 V.33 and Bell 208A/B Options Options Accessible with Summary Setup only Modem Setup Options Modem Modem Setup Options Quick Reset Phone Number StorageLeased Line Auto-Recovery General Operation and Special FeaturesDialing Control Characters Character FunctionDial Backup Dial Line Auto-Recovery DTR Dialing AT &Z0=T555-4545/RDumb Mode And Bell 208 Operation TR MR RS CS Modem Security Operation Password Commands Command Function EXAMPLE1 MEM.LOC.2AT &Z1=/ASECURITY AT &Z5=/PYELLOW Modem-Controlled Remote Control AT &Z0=/UCONNECTEDControl Procedure Modem-to-Modem Control Procedure Using a Rack Controller General Operation and Special Features Remote control-address control mode Diagnostic Interface Control Pin FunctionDiagnostic Port Commands Command FunctionConnect 3,22 Connect 003,022 CON 000003,22Response Meaning Error Address g,uDTE display Automatic Fallback V.22 bis/BELL 212A/BELL 103 Fallback Default Mode DescriptionRate Renegotiation Procedure RRP V.22 bis/V.22/V.21/V.23 FallbackHow to Enable or Disable RRP Rate Change Screen11 V.13 Operation Hayes Emulation Mode Hayes Mode AutodialerAT M2 V1 D 555-1212 S2=1O AT DT 9,212555-1234 or AT DT 9, 212 555Exclamation Flash AT DT 9,555-1212Hayes Compatible Commands AT D3331234 AT D 555-1212 L5 AT S7=30 AT D9,3331234 Hayes Emulation Mode Registers AT S0? S7? AT S0=5Modem Hayes Emulation Mode Selecting Options In Hayes Mode Hayes Mode Reference Tables Hayes Compatible Commands Speaker Control Speaker VolumeProduct Code Or Checksum Forced On-LineTone Dialing Modify S RegisterRead S Register Word/Digit Result CodeLong-Space Disconnect Forced Command StateRecall Factory Configuration Recall Stored User ProfileData Set Ready Control Asynchronous/Synchronous ModeRTS And CTS Options Default User Profile Test CommandsView Active Configuration, etc Write Profile To Memory\B1 Store Telephone NumberBuffer Mode/Speed Conversion MNP Class LimitHayes Compatible Commands Hayes Mode Result Codes Digit Code Word Code Meaning105 Register Range Units Default Description S Register FunctionsV.25 bis Autodialer Enabling The V.25 bis AutodialerV.25 bis Autodialer Commands 109 V.25 bis Autodialer Commands CICSection V.25 bis Dialing ParametersC, D, #, V.25 bis Result Codes DTR Dialing In V.25 bis ModeDialing Parameters V.25 bis Result CodesWhen And Why To Test Symptoms and Scope of The ProblemOverview Of Modem Diagnostics Physical InspectionHow to Select and Activate Tests Diagnostic Monitoring Status Screens116 117 Local Modem Diagnostics Analog Loopback Test119 Analog Loopback Self-Test Albst External Analog Loopback Test Albx 122 External Analog Loopback Self Test Albst 124 Digital Loopback Test DLB Remote Modem Diagnostics Remote Digital Loopback Test RDL127 Remote Digital Loopback Self Test Source Nation Indicator Pin Desig FunctionAppendix B Quick Setup Configurations Table B-1. Quick Setup ConfigurationsTable B-1 . Quick Setup Configurations Dumb LEASED2132 133 134 Appendix C Summary Setup Introduction to Summary SetupFigure C-1. How to access the Summary-Setup Screens Setups Screen Primary Options0 2 1 1 0 0 Primary OptionsDial Line Options V42 1 V42 0 0 0 1 0 2Data Pump Options Pump1 Pump2Miscellaneous Options Misc1 Misc2AT Profiles Screen AT ProfilesREG Screen Figure C-3. Changing the S Register ValueAppendix D Jumpers Appendix D Jumpers Table D-1. Jumper Switch Functions NOM Statement 148 Copyright 1999. Black Box Corporation. All rights reserved
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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