Black Box 34336, MD885AE-R2, MD885C-R2 Physical Inspection, Overview Of Modem Diagnostics

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Modem 34336

7.3 Physical Inspection

The next step in isolating a defective component is inspecting the system. If you can trace the problem to a specific site, examine that site. Check the installation of the modem and DTE. Are all cables in good condition and fully connected? Are all components in the system receiving power? Inspect the system as thoroughly as possible.

7.4 Overview Of Modem Diagnostics

Once you identify the symptoms and conduct a physical inspection of the sites in question, you can use diagnostic monitoring and testing to further isolate the problem. The Modem is equipped with diagnostic capabilities enabling you to locate faults quickly and easily. The diagnostic features of the Modem fall into two categories — local and remote — as listed below.There are six types of local modem diagnostics:

•Analog loopback (ALB)

•Analog loopback self-test (ALBST, or ST)

•Analog loopback self-test with errors (ST/E)

•External analog loopback (ALBX)

•External analog loopback self-test (ALXST)

•Digital loopback (DLB)

There are two types of remote diagnostics:

•Remote digital loopback (RDL)

•Remote digital loopback self-test (RDLST)

The sequence in which you should conduct diagnostic tests depends upon the symptoms you identified, the availability of personnel at the remote site, and external test equipment. The self-test pattern generator and pattern detector built into the Modem alleviate the requirement for external test equipment. With the non-self tests, use either a standard DTE or an external bit error rate test (BERT) to generate test data and compare it with received data.

Because more transmission errors occur at higher speeds on marginal transmission facilities, begin testing at the highest available speed. If errors occur, reduce the speed and try again. If you cannot correct the problem, contact your supplier.

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Contents Modem FCC Information Table of Contents Table of Contents Diagnostics Table of Conents Specifications Specifications Quick Start InstallationFor all applications Quick StartFor leased-line applications For dialup applicationsFront-Panel LCD and Controls Front-Panel LCD and ControlsCS = TR =MR = RS =Quick Setup V25 Dial Sync Available Quick Setup ConfigurationsDial Hayes V25 Dial AsyncQuick Setup 11 2-W Dial Quick Setup 12 2-W Dial V32/208 Quick Setup 07 2-W Leased ANSAT D 5551212 cr Basic OperationAT D 9,5551212 cr AT DP CRN Asynchronous V.25 bis OperationSynchronous V.25 bis Operation Pushbutton 1 Phone Pushbutton 2 Prog ENT Auto-Dial Failure Messages9600 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 Methods For Selecting Options Modem Setup OptionsSelecting Options from the Front-Panel Setup Type Line Speed For Modem SETUPS. The first Options Modem Resultant Data RATE, bps SETTING, 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 Phone Number Storage Quick ResetGeneral Operation and Special Features Leased Line Auto-RecoveryCharacter Function Dialing Control CharactersDial Backup Dial Line Auto-Recovery AT &Z0=T555-4545/R DTR DialingDumb Mode And Bell 208 Operation TR MR RS CS Modem Security Operation Command Function EXAMPLE1 MEM.LOC.2 Password CommandsAT &Z1=/ASECURITY AT &Z5=/PYELLOW AT &Z0=/UCONNECTED Modem-Controlled Remote ControlControl Procedure Modem-to-Modem Control Procedure Using a Rack Controller General Operation and Special Features Remote control-address control mode Pin Function Diagnostic Interface ControlCommand Function Diagnostic Port CommandsConnect 003,022 CON 000003,22 Connect 3,22Address g,u Response Meaning ErrorDTE display Automatic Fallback Mode Description V.22 bis/BELL 212A/BELL 103 Fallback DefaultV.22 bis/V.22/V.21/V.23 Fallback Rate Renegotiation Procedure RRPRate Change Screen How to Enable or Disable RRP11 V.13 Operation Hayes Mode Autodialer Hayes Emulation ModeAT DT 9,212555-1234 or AT DT 9, 212 555 AT M2 V1 D 555-1212 S2=1OAT DT 9,555-1212 Exclamation FlashHayes Compatible Commands AT D3331234 AT D 555-1212 L5 AT S7=30 AT D9,3331234 Hayes Emulation Mode Registers AT S0=5 AT S0? S7?Modem Hayes Emulation Mode Selecting Options In Hayes Mode Hayes Mode Reference Tables Hayes Compatible Commands Forced On-Line Speaker VolumeProduct Code Or Checksum Speaker ControlWord/Digit Result Code Modify S RegisterRead S Register Tone DialingRecall Stored User Profile Forced Command StateRecall Factory Configuration Long-Space DisconnectRTS And CTS Options Asynchronous/Synchronous ModeData Set Ready Control Write Profile To Memory Test CommandsView Active Configuration, etc Default User ProfileMNP Class Limit Store Telephone NumberBuffer Mode/Speed Conversion \B1Hayes Compatible Commands Digit Code Word Code Meaning Hayes Mode Result Codes105 S Register Functions Register Range Units Default DescriptionEnabling The V.25 bis Autodialer V.25 bis AutodialerV.25 bis Autodialer Commands 109 CIC V.25 bis Autodialer CommandsC, D, #, V.25 bis Dialing ParametersSection V.25 bis Result Codes DTR Dialing In V.25 bis ModeDialing Parameters V.25 bis Result CodesSymptoms and Scope of The Problem When And Why To TestPhysical Inspection Overview Of Modem DiagnosticsDiagnostic Monitoring Status Screens How to Select and Activate Tests116 117 Analog Loopback Test Local Modem Diagnostics119 Analog Loopback Self-Test Albst External Analog Loopback Test Albx 122 External Analog Loopback Self Test Albst 124 Digital Loopback Test DLB Remote Digital Loopback Test RDL Remote Modem Diagnostics127 Remote Digital Loopback Self Test Pin Desig Function Source Nation IndicatorTable B-1. Quick Setup Configurations Appendix B Quick Setup ConfigurationsDumb LEASED2 Table B-1 . Quick Setup Configurations132 133 134 Introduction to Summary Setup Appendix C Summary SetupFigure C-1. How to access the Summary-Setup Screens Primary Options Setups ScreenDial Line Options Primary Options0 2 1 1 0 0 0 0 0 1 0 2 V42 1 V42Pump1 Pump2 Data Pump OptionsMisc1 Misc2 Miscellaneous OptionsAT Profiles AT Profiles ScreenFigure C-3. Changing the S Register Value REG ScreenAppendix 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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