Black Box 34336, MD885AE-R2, MD885C-R2, MD885A-R3 user manual 122

Page 123

Modem 34336

NOTE

The ALBX test may result in errors or may fail altogether even where conditions are satisfactory for normal operation. The test channel presented to the modem during the ALBX test includes all impairments of both the inbound and outbound channels (ampli-tude distortion, delay distor-tion, noise, etc.). The main purpose of the ALBX test is to verify that the Modem is connected to the leased line and the leased-line circuit is complete. The test is not meant to assess the suitability of the leased line.

Initiate the ALBX test using the Modem’s front-panel controls, as explained in the following paragraphs.

Make sure the local modem is not in communication with the remote modem, the data rate is the same as the DTE’s data rate, and the DTR circuit is on. (If TR is present on the EIA status screen, the DTR circuit is on.)

From the second page of the LCD MAIN MENU, select TEST. Go to the second page of the LOCAL TEST menu. Select ALBX.

The ANALOG LOOP(EXT) screen is displayed, with ON and OFF as the possible selections.

Select ON to activate the test. In general, the "DSR during ALB test" option discussed in Chapter 2 should be left ON (default selection) to avoid disrupting the DTE and DTE software operations.

The EIA status screen is displayed while the test is being conducted. If no external loopback is present, the status screen displays an IDLE message. If a loopback is present, handshake sequence codes appear (H-01, etc.), followed by the modem speed. Ensure that test data is being generated and watch for data errors. By transmitting test data and comparing it with the received copy, the DTE and modem are checked for proper operation. During the ALBX test, RD (receive data) may appear on the status screen even though no data is being received.

On a flat line, the Modem in ALBX test mode trains and remains running across the following range of signal loss: in V.32 mode, 0-51 dBm (0-52 dBm at 12,000 bps); for V.33 operation, 0-47 dBm; and for Bell 208A/B operation, 0-37 dBm. If signal loss exceeds the limits, the test may not start or may be halted.

During the ALBX test, the modem attempts to retrain upon loss of carrier. In switched carrier mode, the modem attempts to retrain upon loss of RTS.

To end the test, press the ENT pushbutton to return to the ANALOG LOOP(EXT) screen. Then select OFF.

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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 ANSBasic Operation AT D 5551212 crAT D 9,5551212 cr AT DP Asynchronous V.25 bis Operation CRNSynchronous 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 DisconnectAsynchronous/Synchronous Mode RTS And CTS OptionsData 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 CommandsV.25 bis Dialing Parameters C, D, #,Section 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 ScreenPrimary Options Dial Line 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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