Multi-Tech Systems MMV1600 DSUandCommunicationsLineTesting, Remote Digital Loop Test #5

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7.6

DSUandCommunicationsLineTesting

After determining that the channel-device-to-MultiMux portion of the multiplexer network is operating properly, the next steps are to check the operation of the local DSU, the communications line and the remote DSU. By performing the procedures in Table 7-4, the MultiMux can send data (keystrokes) from the channel device and have them echoed through the composite link, remote DSU and back to the channel device’s monitor.

Table 7-4. DSU and Communications Line Testing Procedure

Step Procedure

1Set the source and destination nodes on the local MultiMux to the same node number.

2Place the remote MultiMux unit in Test Mode 5 (Digital Loopback test) by entering the following command.

AT&5 (hit Return)

The supervisory console will display the following message:

REMOTE DIGITAL LOOP - TEST #5

3Enter data on the keyboard of each channel device on the local MultiMux and, if the network is operating correctly, the data will be correctly displayed on the local channel device monitor. If the channel device is equipped with an active local echo feature, double characters will be displayed.

4When you have verified that the communications link is operating correctly, enter the following to end the test:

ATZ (hit Return)

or

AT&T0 (hit Return)

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Contents MultiMux Page Record of Revisions RevisionDescription MultiMux #MMV1600C #MMV3200CTable of Contents Service, Warranty and Tech Support CommandsOperating Procedures TroubleshootingTables AboutThisManual Service, Warranty and Tech Support 1.1 Statistical Multiplexing BackgroundDescription of Statistical Multiplexing Product Description CommunicationsMultiMux MMV1600/3200 Series Block Diagram Page Dynamic Load Balance System Features Voice/FaxNetworking Dual Composite LinksParameter Memory Channel SwitchingCommand Modem DiagnosticsSynchronous Data Channel Dynamic BufferingResponse Time Control AU7USA-20328-MD-E FCC Regulations for Telephone Line InterconnectionDOC Terminal Equipment AU7USA-18883-DE-N DSUInternal DSU Specifications Async Data ChannelsSystem Control Composite LinkDtmf Voice ChannelsElectrical/Physical CompatibilityModel Description Configuration DescriptionConfiguration Configuration 1 Composite Link Configuration Configuration 1 Local Site Channel ParametersConfiguration 1 Remote Site Channel Parameters Configuration 2 Composite Link Configuration Remote Site Configuration 3 Remote Site 2 Channel Parameters Configuration 3 Local Site Channel ParametersConfiguration 3 Remote Site 1 Channel Parameters Configuration 4 Local Site Voice/Fax Channel Parameters Configuration 4 FXO to FXSConfiguration 4 Remote Site Voice/Fax Channel Parameters Configuration 5 E&M Configuration 5 Remote Site Voice/Fax Channel Parameters Configuration 5 Local site Voice/Fax Channel ParametersConfiguration 6 FXS to FXS Configuration 6 Remote Site Voice/Fax Channel Parameters Configuration 6 Local Site Voice/Fax Channel ParametersRemote Site Configuration 7 Remote Site Voice/Fax Channel Parameters Configuration 7 Local Site Voice/Fax Channel ParametersConfiguration 8 LAN to LAN Page External Modem/DSU with RS232C Interface InstallationProcedureCabling Procedure StepProcedureAsync Channel Step ProcedureV.35 Interface Sync Data Channel Port B onlyComposite Link Cabling Supervisory Console Configuration ProcedureCommand Modem Step Procedure Voice/Fax Channels Step Procedure Async ChannelsPage ATC1B4800P1F1E0 Command SummaryType Command Description $DSUASP SNGA..H$DSUACL $DSUBCL#MA CommandDescriptionGeneral Commands Help H command menu is as follows General HelpStore New ParametersH7 menu is as follows H4 menu is as followsH5 menu is as follows H6 menu is as followsChannel Parameter Commands DTR ENQ/ACKMLA/B/D SB2 SB1$ Muxacli Composite Link Speed and Clocking Commands$DSUCL $DSUSP$MUXB Additional Composite Link Commands#RBxxxxx Retransmit TimerList Composite ReportVoice/Fax Channel Commands Command Level ATV1/2LIFXO WireSilence Suppression Local InterfaceATV1/2RIFXSG Test CommandsATV1/2LIFXSL ATV1/2RIFXOT12 Command Modem CommandsT11 Configuration of Port B Composite Link MultiMuxOperatingProceduresMultiMux Operating Procedures Configuration of Port a Composite LinkConfiguration of Port B Sync Data Voice/Fax Operating Procedures Voice/Fax Operating ProceduresCommand Modem Access on Command Modem Operating ProceduresCommand Modem Operating Procedures Command modem operation and put Introduction ImportanceofCompositeStatisticsTestCables TroubleshootingGuideData Troubleshooting Guide RD LED on RD OFF Voice/fax channel Voice/Fax Troubleshooting GuideCannot communicate Local Loop Test #4 ChannelDeviceTestingChannel Device Testing Procedure Remote Digital Loop Test #5 DSUandCommunicationsLineTestingDSU and Communications Line Testing Procedure Watch DOG Test Passed MultiMuxFunctionalTestingProceduresMultiMux Functional Testing Procedures VOICE/FAX Loopback Test #12 Voice/FaxChannelTestingVoice/Fax Channel Testing Procedure Sync Data Channel Testing Procedure SyncDataChannelTestingService, Warranty and Tech Support Repair Procedures for International Distributors AppendixA Ascii Character Code/Hex/Decimal Conversion ChartAppendix B Signal Information Negative PositiveAppendix C Cabling DiagramsDCE to DTE cabling Command Port CablesComposite Link Cabling RJ48 Cabling for Internal DSU I-V Voice/Fax Channel Cable RJ45 Spade Lug Wire Color FunctionVoice/Fax Channel Connectors Description FXO Description FXS DescriptionLast Command Name DefaultAnswer a RepeatATQ1 ATH1ATH0 ATOWrite ATD5551212RRegister Read orStore Active Configuration displaysView Active User ProfilesATX2 ATX0ATX1 After Dial Command ExecutionMode While Returning toAppendix E Table E-1. LED IndicatorsIndicator Description FCR LED Indicators DescriptionBack Panel Command Port TERMINAL/PC Connector ON/OFF SwitchPower Connector BPS Modem DIAL-UP Line ConnectorVOICE/FAX Channel 1 FXS Connector VOICE/FAX Channel 2 FXS ConnectorVOICE/FAX Channel 2 FXO Connector VOICE/FAX Channel 1 E&M ConnectorChannel # Channel Board Number of Channels SwitchRS232C/V.35 Shunt Flow Control Background Appendix FOff Printer pacing and Flow Control Glossary of Terms Page Format Page Parameter Page Page Symbols DSU DOCLads External Composite LinkFXO FXS Link Protocol List Channel Parameters CommandLoad DSU Factory Defaults Command MultiMux Functional Testing ProcedureRJ48S PDNPstn RENStdm Stop Bit Command SB1-SB2Transmit XMT Indicator Voice/Fax Channels Voice/Fax Channel Testing ProcedureVoice/Fax Input Level Gain Command Word Length Select Command WL5-8